tree 7be6dcc962f1b596b3d0ad6ed3e34439c71fae91
parent f283148a0774e9b2de5ae4b42bb7dff50410f8cc
author Andrew Lutomirski <luto@kernel.org> 1484090686 -0800
committer Herbert Xu <herbert@gondor.apana.org.au> 1484238405 +0800

crypto: testmgr - Allocate only the required output size for hash tests

There are some hashes (e.g. sha224) that have some internal trickery
to make sure that only the correct number of output bytes are
generated.  If something goes wrong, they could potentially overrun
the output buffer.

Make the test more robust by allocating only enough space for the
correct output size so that memory debugging will catch the error if
the output is overrun.

Tested by intentionally breaking sha224 to output all 256
internally-generated bits while running on KASAN.

Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>