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x509: fix reading of MGF-1 OID

Daiki Ueno requested to merge dueno/gnutls:wip/dueno/rsa-oaep-followup into master
  • 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@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
Edited by Daiki Ueno

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