[CRYPTO] cipher: Align temporary buffer in cbc_process_decrypt

Since the temporary buffer is used as an argument to cia_decrypt, it must be
aligned by cra_alignmask.  This bug was found by linux@horizon.com.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 3 insertions, 2 deletions

diff --git a/crypto/cipher.c b/crypto/cipher.c
index dfd4bcfc5975..65bcea0cd17c 100644
--- a/crypto/cipher.c
+++ b/crypto/cipher.c
@@ -212,9 +212,10 @@ static unsigned int cbc_process_decrypt(const struct cipher_desc *desc,
         struct crypto_tfm *tfm = desc->tfm;
         void (*xor)(u8 *, const u8 *) = tfm->crt_u.cipher.cit_xor_block;
         int bsize = crypto_tfm_alg_blocksize(tfm);
+        unsigned long alignmask = crypto_tfm_alg_alignmask(desc->tfm);
 
-        u8 stack[src == dst ? bsize : 0];
-        u8 *buf = stack;
+        u8 stack[src == dst ? bsize + alignmask : 0];
+        u8 *buf = (u8 *)ALIGN((unsigned long)stack, alignmask + 1);
         u8 **dst_p = src == dst ? &buf : &dst;
 
         void (*fn)(void *, u8 *, const u8 *) = desc->crfn;