From: Szilveszter Ördög <slipszi@gmail.com>
Date: Wed, 3 Mar 2010 00:03:23 +0000 (+0800)
Subject: crypto: hash - Fix handling of unaligned buffers
X-Git-Tag: upstream/snapshot3+hdmi~14756^2~3
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=cbb9bf65ae25dee772e85589136e7dd1c3e743ae;p=platform%2Fadaptation%2Frenesas_rcar%2Frenesas_kernel.git

crypto: hash - Fix handling of unaligned buffers

The correct way to calculate the start of the aligned part of an
unaligned buffer is:

  offset = ALIGN(offset, alignmask + 1);

However, crypto_hash_walk_done() has:

  offset += alignmask - 1;
  offset = ALIGN(offset, alignmask + 1);

which actually skips a whole block unless offset % (alignmask + 1) == 1.

This patch fixes the problem.

Signed-off-by: Szilveszter Ördög <slipszi@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
---

diff --git a/crypto/ahash.c b/crypto/ahash.c
index 33a4ff4..b8c59b8 100644
--- a/crypto/ahash.c
+++ b/crypto/ahash.c
@@ -78,7 +78,6 @@ int crypto_hash_walk_done(struct crypto_hash_walk *walk, int err)
 	walk->data -= walk->offset;
 
 	if (nbytes && walk->offset & alignmask && !err) {
-		walk->offset += alignmask - 1;
 		walk->offset = ALIGN(walk->offset, alignmask + 1);
 		walk->data += walk->offset;