[PATCH] crypto: ahash - Fix handling of unaligned buffers

[Szilveszter Ordog <slipszi@gmail.com>]

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>
---
 crypto/ahash.c |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)

diff --git a/crypto/ahash.c b/crypto/ahash.c
index f347637..db42202 100644
--- a/crypto/ahash.c
+++ b/crypto/ahash.c
@@ -65,7 +65,6 @@ 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;

-- 
1.5.5.6
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