From 7bdcd851fa7eb66e8922aa7f6cba9e2f2427a7cf Mon Sep 17 00:00:00 2001
From: Corentin Labbe <clabbe@baylibre.com>
Date: Mon, 14 Dec 2020 20:02:26 +0000
Subject: [PATCH] crypto: sun4i-ss - checking sg length is not sufficient
Git-commit: 7bdcd851fa7eb66e8922aa7f6cba9e2f2427a7cf
Patch-mainline: v5.12-rc1
References: git-fixes

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>
Acked-by: Torsten Duwe <duwe@suse.de>

---
 drivers/crypto/sunxi-ss/sun4i-ss-cipher.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/crypto/sunxi-ss/sun4i-ss-cipher.c b/drivers/crypto/sunxi-ss/sun4i-ss-cipher.c
index 19f1aa577ed4..f49797588329 100644
--- a/drivers/crypto/sunxi-ss/sun4i-ss-cipher.c
+++ b/drivers/crypto/sunxi-ss/sun4i-ss-cipher.c
@@ -186,12 +186,12 @@ static int sun4i_ss_cipher_poll(struct skcipher_request *areq)
 	 * 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);
 	}
-- 
2.26.2