crypto: skcipher - Fix skcipher_walk_aead_common

The skcipher_walk_aead_common function calls scatterwalk_copychunks on
the input and output walks to skip the associated data. If the AD end
at an SG list entry boundary, then after these calls the walks will
still be pointing to the end of the skipped region.

These offsets are later checked for alignment in skcipher_walk_next,
so the skcipher_walk may detect the alignment incorrectly.

This patch fixes it by calling scatterwalk_done after the copychunks
calls to ensure that the offsets refer to the right SG list entry.

Fixes: b286d8b1a690 ("crypto: skcipher - Add skcipher walk interface")
Cc: <stable@vger.kernel.org>
Signed-off-by: Ondrej Mosnacek <omosnacek@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/crypto/skcipher.c b/crypto/skcipher.c
index 4faa0fd53b0c120d39022ad726dbbe2c74f787bd..6c45ed536664d34a5a4b1e9a667a7d275b3f236b 100644 (file)
--- a/crypto/skcipher.c
+++ b/crypto/skcipher.c
@@ -517,6 +517,9 @@ static int skcipher_walk_aead_common(struct skcipher_walk *walk,
        scatterwalk_copychunks(NULL, &walk->in, req->assoclen, 2);
        scatterwalk_copychunks(NULL, &walk->out, req->assoclen, 2);
 
+       scatterwalk_done(&walk->in, 0, walk->total);
+       scatterwalk_done(&walk->out, 0, walk->total);
+
        walk->iv = req->iv;
        walk->oiv = req->iv;