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digsig: add hash size comparision on signature verification

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When pkcs_1_v1_5_decode_emsa() returns without error and hash sizes do
not match, hash comparision is not done and digsig_verify_rsa() returns
no error.  This is a bug and this patch fixes it.

The bug was introduced in v3.3 by commit b35e286a64 ("lib/digsig:
pkcs_1_v1_5_decode_emsa cleanup").

Cc: stable@vger.kernel.org
Signed-off-by: Dmitry Kasatkin <dmitry.kasatkin@intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Dmitry Kasatkin 2012-09-12 13:26:55 +03:00 committed by Linus Torvalds
parent 8507876aaa
commit bc01637a80
1 changed files with 4 additions and 2 deletions
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6
lib/digsig.c
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@ -163,9 +163,11 @@ static int digsig_verify_rsa(struct key *key,
memcpy(out1 + head, p, l);
err = pkcs_1_v1_5_decode_emsa(out1, len, mblen, out2, &len);
if (err)
goto err;
if (!err && len == hlen)
err = memcmp(out2, h, hlen);
if (len != hlen || memcmp(out2, h, hlen))
err = -EINVAL;
err:
mpi_free(in);