[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 [email protected]. Signed-off-by: Herbert Xu <[email protected]>
teemow · Jan 9, 2006 · 827c391 · 827c391
1 parent fa9b98f
commit 827c391
Showing 1 changed file with 3 additions and 2 deletions.
diff --git 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;