IDE extension that lets you fix coding issues before they exist! But the problem also exists in the compliant version, so I'm not so sure that it's really compliant. How can this new ban on drag possibly be considered constitutional? The user_data pointer could be invalid in other ways, such as pointing to freed memory. The test was added to catch the possibly theoretical situation where the length of input_str was somehow the maximum size for size_t, and adding one to this size in the malloc expression (to allocated space for the trailing null byte) results in an integer overflow. At worst, it could expose debugging information that would be useful to an attacker, or PS: I also tried the code in android studio which uses Lint and got no warnings. Small typo nit: "such as if i t pointed to freed memory" meant to say "if it" instead (removing whitespace). I suppose we can check that that is not null, but we cannot check that it is valid (in any portable way). Why is there a voltage on my HDMI and coaxial cables? This sounds indeed like a bug in the flow when an exception is raised. At worst, it could expose debugging information that would be useful to an attacker or it could allow an I guess you could write a proposal to modify the C Standard, but our coding standard is meant to provide guidance for the existing language. Search for vulnerabilities resulting from the violation of this rule on the CERT website. Obviously the value of that pointer could have changed since the . Clearly the standard enumerates 1 case of undefined behavior, but makes no special mention of n=0. parsing /proc/self/maps under linux) one might find out whether the pointer points into mapped memory, but this is still not a guarantee of validity because it is very coarse-grained see again the above example. Appropriate typecasting is necessary. The above check can't hurt, as I guess you could have a system with a 32-bit size_t that had a ton of memory and had some crazy banking/selector scheme with pointers. I think that checking for user_data being NULL would be an improvement to the CS so long as there is an explicit mention that user_data being NULL is invalid even if length == 0. SonarLint IntelliJ 4.0.0.2916 Java Rule 'Null pointers should not be dereferenced' I'm getting this fault in the next code when obj can't be null in any scenario. Report False-positive / False-negative [LTS] The new SonarQube LTS is here: SONARQUBE 9.9 LTS, S2259: Null pointers should not be dereferenced, find the list of whitelisted methods here, Rule java:S2259: False-positive NullPointerException bug logged when variable is null-checked by an imported method, What is the issue you are observing, in details, What version of SonarSource products you are using, as well as the version of SonarJava. {"serverDuration": 214, "requestCorrelationId": "084acdc104f21c51"}, EXP34-C. Do not dereference null pointers, Clever Attack Exploits Fully-Patched Linux Kernel, ERR33-C. Detect and handle standard library errors, one compliant and one non-compliant example, CERT Oracle Secure Coding Standard for Java, EXP01-J. I reordered that code example to do all the checks before allocations. My question is; is my solution incorrect? sometimes FP occurs. 5.2 Part 2 Sometimes a helper function is de ned to perform the memory allocation. When I scan with sonar-lint in idea, it seams white list is useful, but when use sonar-scanner, always FP, org.springframework.util.CollectionUtils#isEmpty So the SIZE_MAX check was unnecessary. Reports. We might set a pointer to null even if we are not freeing a object, simply to dissociate one object from another: tty_driver->tty = NULL; /* detach low level driver from the tty device */ Why are physically impossible and logically impossible concepts considered separate in terms of probability? A common memory-leak idiom, is reallocating storage and assigning its address to a pointer that already points to allocated storage. Doing so will cause a NullPointerException to be thrown. We have a false positive with the " Null pointers should not be dereferenced -squid:S2259" rule : We have a "NullPointerException" false positive for which we do not know how to solve it. A NULL pointer can be dereferenced when signatures are being verified on PKCS7 signed or signedAndEnveloped data. A value is checked here to see whether it is null, but this value can't be null because it was previously dereferenced and if it were null a null pointer exception would have occurred at the earlier dereference. But even with this, the concerned object it tagged as a possible NullPointerException problem. Dereferencing a null pointer is undefined behavior. I already tried to put ResponseEntity
National Intelligence Bureau Jamaica Contact Number,
Articles N