diff mbox series

[4.19,201/247] crypto: sun4i-ss - checking sg length is not sufficient

Message ID 20210301161041.500045845@linuxfoundation.org
State New
Headers show
Series None | expand

Commit Message

Greg Kroah-Hartman March 1, 2021, 4:13 p.m. UTC 
From: Corentin Labbe <clabbe@baylibre.com>

commit 7bdcd851fa7eb66e8922aa7f6cba9e2f2427a7cf upstream.

The optimized cipher function need length multiple of 4 bytes.
But it get sometimes odd length.
This is due to SG data could be stored with an offset.

So the fix is to check also if the offset is aligned with 4 bytes.
Fixes: 6298e948215f2 ("crypto: sunxi-ss - Add Allwinner Security System crypto accelerator")
Cc: <stable@vger.kernel.org>
Signed-off-by: Corentin Labbe <clabbe@baylibre.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/crypto/sunxi-ss/sun4i-ss-cipher.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
diff mbox series

Patch

--- a/drivers/crypto/sunxi-ss/sun4i-ss-cipher.c
+++ b/drivers/crypto/sunxi-ss/sun4i-ss-cipher.c
@@ -189,12 +189,12 @@  static int sun4i_ss_cipher_poll(struct s
 	 * we can use the SS optimized function
 	 */
 	while (in_sg && no_chunk == 1) {
-		if (in_sg->length % 4)
+		if ((in_sg->length | in_sg->offset) & 3u)
 			no_chunk = 0;
 		in_sg = sg_next(in_sg);
 	}
 	while (out_sg && no_chunk == 1) {
-		if (out_sg->length % 4)
+		if ((out_sg->length | out_sg->offset) & 3u)
 			no_chunk = 0;
 		out_sg = sg_next(out_sg);
 	}