Thanks Datong Sun for the patch. Export. The Coverity analysis: 1. Coverity overage or ommon eakness Enumeration (CWE): ava EUE IE 2016 Synopsys 8 CWE CWE Name Coverity Static Analysis Checker 476 (cont’d) NULL Pointer Dereference FB.NP_NULL_ON_SOME_PATH FB.NP_NULL_ON_SOME_PATH_EXCEPTION FB.NP_NULL_ON_SOME_PATH_FROM_RETURN_VALUE FB.NP_NULL_ON_SOME_PATH_MIGHT_BE_INFEASIBLE FB.NP_NULL… Hi, Please find the latest report on new defect (s) introduced to NetBSD-i386-kernel found with Coverity Scan. The static analysis by Coverity is done on the C++ code (so, specially C++ gurus are welcome ), but the latest version also started to support python versions 2.7.x, so in the future we could have more or less all of the FreeCAD code covered. Dereferencing a null pointer is undefined behavior, typically abnormal program termination. coverity#1078827 dereference before null check [Caolán McNamara] coverity#1257113 uninitialized pointer field [Caolán McNamara] coverity#1272392 see if … Condition "ssb.values != NULL", taking false branch 4. var_compare_op: Comparing "ssb.values" to null implies that "ssb.values" might be null. Null pointer dereferences • Dereference after null check • Dereference before null check • Dereference null return value Code maintainability issues • Calling a deprecated method • Explicit garbage collection • Static set in non-static method Java/C# Defects That Coverity Can Find 13 Confidential: For Coverity and Partner use only. Created: Jan 26 2021 02:47:29 PM UTC Updated: Jan 26 2021 10:07:21 PM UTC Resolved: Log In. You can merge this pull request into a Git repository by running: Alternatively you can review and apply these changes as the patch at: Your homework assignment solution should be a 500-600-word double-spaced document with at least two references dated within the past 5 years. During the last weeks, were reportet three bugs caused by derefererencing a Null pointer (#938, #916, #859). Null pointer differences • Dereference after a null check! 726429 – Coverity: Null pointer dereference, dereference after null check, FORWARD_NULL. return (errno == 0 ? Return value of function, which is statistically inferred to return null, but with no source code available, is dereferenced. Once the value of the location is obtained by the pointer, this pointer is considered dereferenced. • User pointer dereference! Pointer is a programming language data type that references a location in memory. It is important to note that function GetImagePixels might return NULL if any exception happens. bugfix: fixed memory leak in debug log. A cursory web search reveals some implementations which do crash on NULL input, so this is a valid issue. The code however immediately jumped back to label "retry_write" which dereferenced the "i2c->msg" making it a possible NULL pointer dereference. upgraded lua-resty-core to v0.1.22rc1 ARTEMIS-1636 Coverity: Null pointer dereferences (FORWARD_NULL) in JournalStorageManager.java Open ARTEMIS-1412 Coverity: Use of freed resources in LargeMessageControllerImpl.java Coverity is We continue to improve our analysis technology and open source software is a powerful validation for our new technology. GitHub user strotyl opened a pull request: TS-4598 : Coverity Null-Check after deref in NetworkUtilisRemote.cc. Coverity and clang get a lot of positive press about doing this, but any details of exactly *what* they do have been either carefully hidden (in Coverity's case) or undocumented (clang's page on this is blank). If the dereference is NULL, the check programmer should be warned to place the check against NULL before dereference. WT-3307 FI testing: segfault in python test … L3 bugfix: ignore the raw argument when acquiring UDP request socket. 476 NULL Pointer Dereference • FORWARD_NULL • NULL_RETURNS • REVERSE_INULL 480 Use of Incorrect Operator • CONSTANT_EXPRESSION_RESULT • NO_EFFECT. Does it just mean failing to correctly check if a value is null? Also, the term 'pointer' is bad (but maybe it comes from the FindBugs tool): Java doesn't have pointers, it has references. Condition !is_msgend(i2c), taking false branch. wintrust: Add some CryptCATCDF stubs. r872402 | hwright | 2008-07-29 15:33:47 -0500 (Tue, 29 Jul 2008) Avoid passing a NULL value to strcmp(). 726431 – Coverity: Null pointer dereference, dereference after null check, REVERSE_INULL. Unchecked return value leads to resultant … WT-7477 Fix coverity bug: possible NULL dereference. The code however immediately jumped back to label "retry_write" which dereferenced the "i2c->msg" making it a possible NULL pointer dereference. This code will definitely crash due to a null pointer dereference in certain cases. Keywords : NPD.GEN.MIGHT Null pointer may be dereferenced NPD.GEN.MUST Null pointer will be dereferenced RNPD.CALL Suspicious dereference of pointer in function call before NULL check RNPD.DEREF Suspicious dereference of pointer before NULL check EXP50-CPP: MISRA.EXPR.PARENS Coverity 1352899: Dereference before null check. In general, NULL pointer dereference flaws are considered non-exploitable. If a null pointer NULL pointer in C. A null pointer is a pointer which points nothing. XML Word Printable. return (errno == 0 ? Date: Thu, 17 Apr 2014 08:19:10 -0700. As reported by a Coverity scan of ntpd/ntp_proto.c: 414static void 415handle_procpkt( 416 struct recvbuf *rbufp, 417 struct peer *peer 418 ) 419{ >>> deref_ptr: Directly dereferencing pointer peer. ... Coverity Collector User Votes: 0 Vote for this issue Watchers: 1 Start watching this issue. Paul Vriens (28): wintrust/tests: Add a test for enumerating catalog attributes. Cc: Usman Ansari
Signed-off-by: William Tu --- lib/conntrack.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) After that 'gl' is dereferenced in the looping check by __lockref_is_dead(). Keywords : Coverity assumed that the pointer is null 3. Maybe a positive one. Finding Null Pointer Bugs with FindBugs •FindBugs looks for a statement or branch that, if executed, guarantees a null pointer exception •Either a null pointer exception could be thrown, or the program contains a statement/branch that can’t be executed •Could look for exceptions that only occur on a path The “The Coverity platform finds critical issues such as buffer overflows, null pointer dereferences, concurrency issues and resource leaks, as well … Analysis Metrics. Module – 10 HomeWork In the section titled “Measures and Metrics: Example Coverity”, there is a list of 13 vulnerabilities. Summary: Coverity: Null pointer dereference, dereference after null check, FORWARD_NULL. • Thread deadlock! EXP34-C Do not dereference null pointers. • Double lock or missing unlock! Type: Bug ... Dereferencing pointer p. ... CID 1352899 (#1 of 1): Dereference before null check (REVERSE_INULL) check_after_deref: Null-checking p suggests that it may be null, but it has already been dereferenced on all paths leading to the check. Coverity CID 279957 reports NULL pointer derefence when 'conn' is NULL and calling ct_print_conn_info. Program hangs • Infinite loop • Double lock or missing unlock • Negative loop bound • Thread deadlock • sleep() while holding a lock Null pointer differences • Dereference after a null check • Dereference a null return value • Dereference before a null check Code maintainability issues • Multiple return statements • Unused pointer value Insecure data handling • Dereference a null return value! Since a pointer was set to 1, it also requires that the … Project Name CID Checker Category Developer Description; freetds2: 90703: FORWARD_NULL: Null pointer dereferences: This bug was quite hard to spot! The exception vector table is a set of branch instructions that correspond to different exceptions, such as software and hardware interrupts. The C Language Doesn’t Always Play Nice From: scan-admin%coverity.com@localhost Date: Thu, 05 Jun 2014 00:20:32 -0700 Hi, Please find the latest report on new defect(s) introduced to NetBSD-i386-kernel found with Coverity … 420 int outcount = peer->outcount; 421 422 /* Shouldn't happen, but include this for safety. WT-3300 Coverity 1374542: Dereference after null check. What do you think? quartz: Fix NULL pointer dereference (Coverity). Posted Jul 20, 2009 20:14 UTC (Mon) by clugstj (subscriber, #4020) [ Link ] It's even a little more convoluted than mentioned in the next-to-the-last paragraph. There is a initial check for possible 'gl' NULL. Chain: The return value of a function returning a pointer is not checked for success ( CWE-252) resulting in the later use of an uninitialized variable ( CWE-456) and a null pointer dereference ( CWE-476) CVE-2007-3798. From:: sle-security-updates@lists.suse.com: To:: sle-security-updates@lists.suse.com: Subject:: SUSE-SU-2021:1915-1: important: Security update for the Linux Kernel New Defect(s) reported by Coverity Scan From: Scan Subscription Date: Mon Dec 31 2012 - 19:15:04 EST Next message: Junio C Hamano: "[ANNOUNCE] Git v1.8.1" Previous message: Eric Wong: "Re: [PATCH] poll: prevent missed events if _qproc is NULL" Next in thread: Nigel Cunningham: "[PATCH] Re: New Defect(s) reported by Coverity Scan" Messages sorted by: The most common type of code defect, accounting for 28 percent of all the defects found, was the NULL pointer dereference, as the use of pointers in C/C++ is error-prone, according to Coverity. • Negative loop bound! Thanks Ilya Shipitsin for the patch. Magick++/lib/Image.cpp (colorMap): Try to eliminate Coverity CID 172796 "Dereference after null check" which seems to be bogus. Some uses of the null pointer are: a) To initialize a pointer variable when that pointer variable isn’t assigned any valid memory address yet. Assuming unimplemented function "__errno_location" may return a null value. On the XScale and ARM architectures the memory address 0 is mapped, and also holds the exception vector table. This is fixing Coverity issue CID 1237320. Activity. Message ID: 20210429110040.63119-1-colin.king@canonical.com (mailing list archive)State: New: Headers: show Coverity static analysis: Dereference null return value in ServerAuthenticationContext (Elytron) Log In. This release contains a lot of bug fixes, many detected by scan.coverity.com (and more to come). Potential null pointer dereference crash when crypt(3) returns NULL. Hello, Coverity detected in 'fs/gfs2/glock.c' a possible dereference after null check. Would be OK to have a group of fixes with a message like "Coverity Null Pointer Dereference warnings in TechDraw"? Then, the next conditional check (x!=0) takes a true branch and in the next line p is dereferenced, leading to a null pointer dereference. Well, it identifies hundreds of known code vulnerabilities, covers security standard and also make sure to address industry compliance regulations. Coverity Prevent cannot discover all violations of this rule, so further verification is necessary Context sensitive analysis Detects when NULL is dereferenced (Array of pointers is not checked. Pointer members in structs are not checked.) Finds instances where a pointer is checked against NULL and then later dereferenced Missed null pointer detection. Coverity detected a pointer 2. The project discovered that larger projects are not prone to a higher density of bugs, a finding that contradicts conventional wisdom. Summary: Coverity: Null pointer dereference, dereference after null check, REVERSE_INULL. "stat_threshold == 0" means no statistical treatment. Bug 772848 - Coverity scan founds some new resource leaks and NULL pointer dereferenceSummary: Coverity scan founds some new resource leaks and NULL pointer dereference. You can use reference to CVE numbers if needed. Now that we can sort it out it will make our game more stable. Bug 726429 - Coverity: Null pointer dereference, dereference after null check, FORWARD_NULL. But what exactly does it mean to "dereference a null pointer"? Static code analysis looks at source … gdiplus: Implemented GdipCreateRegionHrgn for rectangular regions. This type of issue can be detected at compiled time with dataflow analysis. Interprocedural dataflow analysis traces values through a program's call and return paths in order to locate defects, such as null pointer dereferences, that are extremely difficult to … Does it just mean failing to correctly check if a value is null? This could allow the server to make the client crash due to the NULL pointer dereference. WT-7481 Fix the wrong assert of disk image write gen comparison with btree base write gen. L3 EXP37-C Call functions with the correct number and type of arguments. L1 EXP35-C Do not modify objects with temporary lifetime. Subject: New Defects reported by Coverity Scan for NetBSD-i386-kernel. Analysis of the Linux Kernal Coverity Prevent™1, our flagship product, is used by industry leaders such as Juniper Networks, 1875static int gfs2_glock_iter_next(struct gfs2_glock_iter *gi) 1876{ 1877 struct gfs2_glock *gl; 1878 1879 do { 1880 gl = gi->gl; 1. It's complaining because the function both checks that response isn't NULL (line 280) and uses it without checking (line 288). (1) Event cond_true: Condition "a == 0", taking true branch. Fun with NULL pointers, part 1. This bug was quite hard to spot! The Coverity analysis: 1. Coverity currently has over 40 customers and has quadrupled in size over the last year. Re: [PATCH] net: ipv6: check for validity before dereferencing cfg->fc_nlinfo.nlh From: patchwork-bot+netdevbpf Date: Thu Apr 08 2021 - 19:50:38 EST Next message: Linus Torvalds: "Re: [RFC][PATCH] mm: Split page_has_private() in two to better handle PG_private_2" Previous message: patchwork-bot+netdevbpf: "Re: [PATCH net v2 0/2] lantiq: GSWIP: two more fixes" NULL_RETURNS: Null pointer dereferences: Possible Null Pointer exception was found in a feature in which I'm the feature owner. • Dereference before a null … NULL pointer dereference erros are common in C/C++ languages. To be able to detect in cov-analysis you will need to add the argument "-co NULL_RETURNS:stat_threshold:0" (or aggressiveness-level high) to get the desired NULL_RETURNS. The main reason for the release is a fix for an SQL injection (and path traversal) bug triggered by specially crafted (and invalid) Host: headers. Interprocedural analysis [show … If your change makes it stop complaining it's only because you've managed to confuse it. This security hole affected a version of the kernel which had not been widely distributed, so it was a problem for relatively few users, but it highlighted a class of problems which was sure to be seen again. XML Word Printable. Either the check against null is unnecessary, or there may be a null pointer dereference. null-pointer dereferences, divide-by-zeros, buffer over- and underruns: Nov 2012: Coverity: C, C++, Java, C#: Synopsys flaws and security vulnerabilities - reduces false positives while minimizing the likelihood of false negatives. Message ID: 20210429110040.63119-1-colin.king@canonical.com (mailing list archive)State: New: Headers: show The chkpass extension uses the standard crypt() library function, which is defined to return NULL on failure, but it was not checking for NULL before using the result. Security fixes. Last Analyzed: Aug 07, 2016. Null pointer in C. NULL pointer in C, “An integer constant expression with the value 0, or such an expression cast to type void *, is called a null pointer constant. Also, the term 'pointer' is bad (but maybe it comes from the FindBugs tool): Java doesn't have pointers, it has references. Once the value of the location is obtained by the pointer, this pointer is considered dereferenced. The NULL pointer dereference weakness occurs where application dereferences a pointer that is expected to be a valid address but instead is equal to NULL. The following C++ example causes a NULL pointer dereference error: 3. Lines of Code Analyzed: 1,630,108. Version: 0.17.8158. Coverity Data Sheet • Concurrency defects such as deadlocks, race conditions and blocking misuse • Performance degradation problems due to memory leaks, file handle leaks, custom memory and network resource leaks, database connection leaks • Crash-causing errors such as null pointer dereference, use-after-free, doublefree, improper memory Other • Copy-paste errors! ... (NULL_RETURNS)3. dereference: Dereferencing a pointer that might be null name when calling isSameName. . Details. That exception could have rendered the entire feature non operational (And many log messages that the user wouldn't understand). Coverity Scan may have found an issue in listobject's merge code. L3 EXP39-C Do not access a variable through a pointer of an incompatible type. WT-7476 Update configuration handling to allow for optional configuration settings. Therefore, the subsequent usage of this NULL return value might cuase null pointer dereference.. As I have reviewed the usage of function GetImagePixels in other source files, its return value is usually checked with NULL, which is safe enough. Null pointer dereferences This defect on our template caused null pointer deferencing in over hundred use cases. Describe briefly the fixes for 5 of them? bugfix: fix possible null pointer dereference found by Coverity. Another situation this can happen is when the pointer is dereferenced before it has been checked against NULL. Coverity Support for CWE Top 25 CWE Top 25 (2019*) CWE Java C# C/C++ CUDA Obj-C JavaScript/ TypeScript Kotlin Node.js Android Swift Python 3.x PHP Scala VB.NET Ruby Go 1. Description of problem: As summary, Memory leaks/NULL pointer dereference often causes programming/process bad issues such as crashing a process, so we should fix them early. The bug comes from the fact that user_stack_pointer() and current_user_stack_pointer() don't return the same register: ulong user_stack_pointer(struct pt_regs *regs) { return regs->ar_bspstore; } #define current_user_stack_pointer() (current_pt_regs()->r12) The change gets both back in sync. lighttpd SA-2014-01 (CVE-2014-2323, CVE-2014-2324) Downloads Dereferencing it means trying to access whatever is pointed to by the pointer. The * operator is the dereferencing operator: This is exactly the same thing as a NullReferenceException in C#, except that pointers in C can point to any data object, even elements inside an array. Apr 2011: Cppcheck: C, C++: free ... <<< CID 102061: Null pointer dereferences REVERSE_INULL <<< Null-checking " doc_bv " suggests that it may be null, but it has already been dereferenced on all paths leading to the check. int *p = NULL; x = *p; // null pointer dereference int b; c = b; // uninitialized variable int x[10]; … b = x[10]; // access past end of array x = (i++) + a[i]; // when is i incremented? Coverity complains below message: CID 25469 (#1 of 1): Explicit null dereferenced (FORWARD_NULL) 9. var_deref_op: Dereferencing null pointer q. I do not understand why coverity complains here. L3 EXP36-C Do not cast pointers into more strictly aligned pointer types. Assert check that the net_ipv6_nbr_lookup() did not return NULL fixes zephyrproject-rtos#26359 Signed-off-by: David Leach dleach02 mentioned this issue Aug 15, 2020 Address multiple Coverity issues #27591 Compliant Solution (snprintf(null))If unknown, the length of the formatted string can be discovered by invoking snprintf() with a null buffer pointer to determine the size required for the output, then dynamically allocating a buffer of sufficient size, and finally calling snprintf() again to format the output into the dynamically allocated buffer. Description of problem: Coverity found some issues by defecting libvirt-0.8.2-25.el5.src.rpm: Analysis summary report: ----- Files analyzed : 180 Total LoC input to cov-analyze : 214852 Functions analyzed : 5206 Paths analyzed : 586453 Defect occurrences found : 41 Total 3 CHECKED_RETURN 6 DEADCODE 5 FORWARD_NULL 7 MISSING_BREAK 1 NULL_RETURNS 1 OVERRUN_STATIC … Condition !is_msgend(i2c), taking false branch. Keywords : Status : Although most modern implementations of strcmp() include a NULL check, the C89 standard, which we claim to support, does not allow this. Bug 1205288 - Coverity-detected defect: null pointer dereferences in uri.cSummary: Coverity-detected defect: null pointer dereferences in uri.c. • REVERSE_NULL: A program will normally crash when a NULL pointer is dereferenced. • sleep() while holding a lock! Coverity signaled a null pointer dereference by adding the moz_assert we check at runtime the validity of that pointer, at least that it's different than null, and we instruct coverity that the null pointer case is treated by our assert function, at least on debug. WT-7478 Fix coverity printf arg type to match format. @mihaipopescu pointed out, that most often the Null pointer dereferencing is not the root cause of the bug. Description. WT-3303 Deadlock during first access to lookaside table. Paul Chitescu (1): wined3d: Detect Radeon Xpress Series, report PCI ID of Radeon Xpress 200M. Program hangs • Infinite loop! Coverity Prevent uses a combination of analysis techniques to accurately and efficiently identify defects. Thanks Hawker for the patch. coders/png.c (WriteOnePNGImage): Fix Coverity CID 168053 "Dereference after null check". Basically, yes. From: coverity-bot To: Aditya Pakki Cc: Santosh Shilimkar , "David S. Miller" , "Gustavo A. R. Silva" , linux-next@vger.kernel.org Subject: Coverity: rds_send_remove_from_sock(): Null pointer dereferences Date: Thu, 8 Apr 2021 16:40:39 -0700 … WT-3302 Failure to create cache pool manager thread results in crash when destroying cache pool. If value of x passed into the function is not zero, p is assigned a null pointer with p=0. Dates. Export. a potential null pointer dereference, and from a program analysis Null dereference warnings for Ant versions 1.5.0 true false 1.6.0 1.6.5 [9] 82 4 130 82 corrected 75 11 110 62 Table 1. Corrections of XYLEM results from [9] point of view, it would be more precise to talk about algorithms for finding potential null pointer dereferences. CVE-2014-0066 PostgreSQL: Potential null pointer dereference crash when crypt(3) returns NULL Explanation. In some situations, however, dereferencing a null pointer can lead to the execution of arbitrary code [ Jack 2007, van Sprundel 2006 ]. ‘NULL pointer dereference’* was the most common bug identified by the scans. Fixes #22657 Coverity-CID: 208191 Signed-off-by: Alexander Wachter kamilrakoczy added a commit to antmicro/zephyr that … I'm not familiar with the code so I don't know if ssb.value can be NULL here. Bug 726431 - Coverity: Null pointer dereference, dereference after null check, REVERSE_INULL. WT_ERROR : errno); Dereferencing "__errno_location ()", which is known to be "NULL". 476 NULL Pointer Dereference FORWARD_NULL NULL_RETURNS REVERSE_INULL 480 Use of Incorrect Operator CONSTANT_EXPRESSION_RESULT 483 Incorrect Block Delimitation NESTING_INDENT_MISMATCH 484 Omitted Break Statement in Switch MISSING_BREAK 561 Dead Code DEADCODE UNREACHABLE The simplist fix is to pass the > address of dummy temperature variable instead of a NULL pointer. Coverity Static Analysis is is derived from the Stanford Checker, a research tool for finding bugs through static analysis [from Wikipedia] Coverity Static Analysis detects dozens of defect patterns in the following categories. 465 Pointer Issues NO_EFFECT 467 Use of sizeof() on a Pointer Type BAD_SIZEOF SIZEOF_MISMATCH 476 NULL Pointer Dereference FORWARD_NULL NULL_RETURNS REVERSE_INULL 480 Use of Incorrect Operator CONSTANT_EXPRESSION_RESULT NO_EFFECT 481 Assigning instead of Comparing PARSE_WARNINGS 482 Comparing instead of Assigning … This might well be the case and often the fix is more complicated than just adding a check for a NULL pointer. On July 16, Brad Spengler disclosed an easily-exploitable kernel vulnerability based on getting the kernel to dereference a null pointer. Details. But what exactly does it mean to "dereference a null pointer"? Basically, yes. An extremely nice thing which was discovered only by Coverity. Coverity Static Analysis is a static code analysis tool for C, C++, C#, Java, and JavaScript. Description A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit.
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