crypto: hash - Fix handling of small unaligned buffers

[net-next-2.6.git] / crypto / ahash.c

diff --git a/crypto/ahash.c b/crypto/ahash.c
index b8c59b889c6ea579e7a6bacd7241bbbc86cbe44c..f669822a7a443c81a04c8fb61d8d382a64546542 100644 (file)
--- a/crypto/ahash.c
+++ b/crypto/ahash.c
@@ -47,8 +47,11 @@ static int hash_walk_next(struct crypto_hash_walk *walk)
        walk->data = crypto_kmap(walk->pg, 0);
        walk->data += offset;
 
-       if (offset & alignmask)
-               nbytes = alignmask + 1 - (offset & alignmask);
+       if (offset & alignmask) {
+               unsigned int unaligned = alignmask + 1 - (offset & alignmask);
+               if (nbytes > unaligned)
+                       nbytes = unaligned;
+       }
 
        walk->entrylen -= nbytes;
        return nbytes;