[gnutls-devel] GnuTLS | Add check for memory allocation APIs to avoid NULL pointer dereference (!2008)

[Read-only notification of GnuTLS library development activities]

Daiki Ueno created a merge request: https://gitlab.com/gnutls/gnutls/-/merge_requests/2008

Project:Branches: dueno/gnutls:wip/purdue-university1/malloc-check2 to gnutls/gnutls:master
Author:   Daiki Ueno




<!-- Add a description of the new feature/bug fix. Reference any relevant bugs. -->

This is a clone of !2006 and !2007 opened for CI purposes, including the following fixes:

* tests/key-usage-ecdhe-rsa.c: Add gnutls_free() to avoid memory leak

Add gnutls_free() to free p if error occurs to avoid memory leak.

Fixes: b167cc373 ("tests: added checks on signature key usage violations")

* Add check for memory allocation APIs to avoid NULL pointer dereference

Add check for the return value of memory allocation APIs to avoid NULL
pointer dereference.

## Checklist
 * [x] Commits have `Signed-off-by:` with name/author being identical to the commit author
 * [ ] Code modified for feature
 * [ ] Test suite updated with functionality tests
 * [ ] Test suite updated with negative tests
 * [ ] Documentation updated / NEWS entry present (for non-trivial changes)

## Reviewer's checklist:
 * [ ] Any issues marked for closing are addressed
 * [ ] There is a test suite reasonably covering new functionality or modifications
 * [ ] Function naming, parameters, return values, types, etc., are consistent and according to `CONTRIBUTION.md`
 * [ ] This feature/change has adequate documentation added
 * [ ] No obvious mistakes in the code

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