[openssl/openssl] b9ba50: Fix coverity-1604666

[Neil Horman]

  Branch: refs/heads/openssl-3.0
  Home:   https://github.com/openssl/openssl
  Commit: b9ba50cdcafe5803ca56ebf07291703654aafb9b
      https://github.com/openssl/openssl/commit/b9ba50cdcafe5803ca56ebf07291703654aafb9b
  Author: Neil Horman <nhorman at openssl.org>
  Date:   2024-07-17 (Wed, 17 Jul 2024)

  Changed paths:
    M crypto/rsa/rsa_oaep.c

  Log Message:
  -----------
  Fix coverity-1604666

Coverity recently flaged an error in which the return value for
EVP_MD_get_size wasn't checked for negative values prior to use, which
can cause underflow later in the function.

Just add the check and error out if get_size returns an error.

Reviewed-by: Paul Dale <ppzgs1 at gmail.com>
Reviewed-by: Tomas Mraz <tomas at openssl.org>
(Merged from https://github.com/openssl/openssl/pull/24896)

(cherry picked from commit 22e08c7cdc596d4f16749811d1022fb8b07a8e41)



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