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crypto: assert that qcrypto_hash_digest_len is in range 

Otherwise unintended results could happen.  For example,
Coverity reports a division by zero in qcrypto_afsplit_hash.
While this cannot really happen, it shows that the contract
of qcrypto_hash_digest_len can be improved.

Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
This commit is contained in:
Paolo Bonzini 2016-05-20 11:09:54 +02:00 committed by Daniel P. Berrange
parent e7ed11f083
commit b35c1f3361
1 changed files with 1 additions and 3 deletions
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4
crypto/hash.c
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@ -36,9 +36,7 @@ static size_t qcrypto_hash_alg_size[QCRYPTO_HASH_ALG__MAX] = {
size_t qcrypto_hash_digest_len(QCryptoHashAlgorithm alg)
{
if (alg >= G_N_ELEMENTS(qcrypto_hash_alg_size)) {
return 0;
}
assert(alg < G_N_ELEMENTS(qcrypto_hash_alg_size));
return qcrypto_hash_alg_size[alg];
}