[PATCH] crypto: xts: use memmove to avoid overlapped memory copy

[Colin King]

From: Colin Ian King <colin.king@xxxxxxxxxxxxx>

There is a memcpy that performs a potential overlapped memory copy
from source b to destination b + 1.  Fix this by using the safer
memmove instead.

Addresses-Coverity: ("Overlapping buffer in memory copy")
Fixes: 8083b1bf8163 ("crypto: xts - add support for ciphertext stealing")
Signed-off-by: Colin Ian King <colin.king@xxxxxxxxxxxxx>
---
 crypto/xts.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/crypto/xts.c b/crypto/xts.c
index 3565f3b863a6..fa3e6e7b7043 100644
--- a/crypto/xts.c
+++ b/crypto/xts.c
@@ -169,7 +169,7 @@ static int cts_final(struct skcipher_request *req,
 				      offset - XTS_BLOCK_SIZE);
 
 	scatterwalk_map_and_copy(b, rctx->tail, 0, XTS_BLOCK_SIZE, 0);
-	memcpy(b + 1, b, tail);
+	memmove(b + 1, b, tail);
 	scatterwalk_map_and_copy(b, req->src, offset, tail, 0);
 
 	le128_xor(b, &rctx->t, b);
-- 
2.27.0