[gnutls-devel] GnuTLS | lib/file.c: Add check for gnutls_malloc() (!1984)

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Jiasheng Jiang created a merge request: https://gitlab.com/gnutls/gnutls/-/merge_requests/1984

Project:Branches: JiashengJiang/gnutls:patch19 to gnutls/gnutls:master
Author:   Jiasheng Jiang




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

* lib/file.c: Add check for gnutls_malloc()

Add check for the return value of gnutls_malloc() to avoid potential NULL pointer dereference.

Fixes: d1428c0f9 ("helper.c -> file.c")
Signed-off-by: Jiasheng Jiang <jiashengjiangcool at gmail.com>

## Checklist
 * [ ] 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)
 * [ ] CI timeout is 2h or higher (see Settings/CICD/General pipelines/Timeout)

## 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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