tree 5999136a4475476f618a7aea1caee810634da896
parent f284a4d87cde103cd78de64b8607e3c80a17e2e5
author Andy Lutomirski <luto@kernel.org> 1483509284 -0800
committer Andy Lutomirski <luto@kernel.org> 1484090656 -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>