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crypto: sun8i-ce - do not fallback if cryptlen is less than sg length 

The sg length could be more than remaining data on it.
So check the length requirement against the minimum between those two
values.

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 2022-05-02 20:19:29 +00:00 committed by Herbert Xu
parent aff388f787
commit 42a01af3f1
1 changed files with 10 additions and 2 deletions
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12
drivers/crypto/allwinner/sun8i-ce/sun8i-ce-cipher.c
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@ -27,6 +27,7 @@ static int sun8i_ce_cipher_need_fallback(struct skcipher_request *areq)
struct scatterlist *sg;
struct skcipher_alg *alg = crypto_skcipher_alg(tfm);
struct sun8i_ce_alg_template *algt;
unsigned int todo, len;
algt = container_of(alg, struct sun8i_ce_alg_template, alg.skcipher);
@ -51,28 +52,35 @@ static int sun8i_ce_cipher_need_fallback(struct skcipher_request *areq)
return true;
}
len = areq->cryptlen;
sg = areq->src;
while (sg) {
if (!IS_ALIGNED(sg->offset, sizeof(u32))) {
algt->stat_fb_srcali++;
return true;
}
if (sg->length % 4) {
todo = min(len, sg->length);
if (todo % 4) {
algt->stat_fb_srclen++;
return true;
}
len -= todo;
sg = sg_next(sg);
}
len = areq->cryptlen;
sg = areq->dst;
while (sg) {
if (!IS_ALIGNED(sg->offset, sizeof(u32))) {
algt->stat_fb_dstali++;
return true;
}
if (sg->length % 4) {
todo = min(len, sg->length);
if (todo % 4) {
algt->stat_fb_dstlen++;
return true;
}
len -= todo;
sg = sg_next(sg);
}
return false;