crypto: algif_hash - Fix NULL hash crash with shash
Recently algif_hash has been changed to allow null hashes. This triggers a bug when used with an shash algorithm whereby it will cause a crash during the digest operation. This patch fixes it by avoiding the digest operation and instead doing an init followed by a final which avoids the buggy code in shash. This patch also ensures that the result buffer is freed after an error so that it is not returned as a genuine hash result on the next recv call. The shash/ahash wrapper code will be fixed later to handle this case correctly. Fixes: 493b2ed3 ("crypto: algif_hash - Handle NULL hashes correctly") Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au> Tested-by: NLaura Abbott <labbott@redhat.com>
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