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crypto: sun4i-ss - checking sg length is not sufficient 

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: 6298e94821 ("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>
This commit is contained in:
Corentin Labbe 2020-12-14 20:02:26 +00:00 committed by Herbert Xu
parent 583513510a
commit 7bdcd851fa
1 changed files with 2 additions and 2 deletions
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4
drivers/crypto/allwinner/sun4i-ss/sun4i-ss-cipher.c
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@ -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);
}