[gnutls-devel] GnuTLS | x509: fix reading of MGF-1 OID (!1819)

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Daiki Ueno created a merge request: https://gitlab.com/gnutls/gnutls/-/merge_requests/1819

Project:Branches: dueno/gnutls:wip/dueno/rsa-oaep-followup to gnutls/gnutls:master
Author:   Daiki Ueno




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

* x509: fix reading of MGF-1 OID

asn1_read_value may return error code in a positive integer thus the
previous code could lead to an access to uninitialized value.  This is
a regression in the RSA-OAEP support.  Spotted by oss-fuzz:
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=67300

Signed-off-by: Daiki Ueno <ueno at gnu.org>

## 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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