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crypto: sun8i-ss - handle zero sized sg 

sun8i-ss does not handle well the possible zero sized sg.

Fixes: d9b45418a9 ("crypto: sun8i-ss - support hash algorithms")
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 20:19:15 +00:00 committed by Herbert Xu
parent 359e893e8a
commit c149e4763d
1 changed files with 9 additions and 1 deletions
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10
drivers/crypto/allwinner/sun8i-ss/sun8i-ss-hash.c
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@ -380,13 +380,21 @@ int sun8i_ss_hash_run(struct crypto_engine *engine, void *breq)
}
len = areq->nbytes;
for_each_sg(areq->src, sg, nr_sgs, i) {
sg = areq->src;
i = 0;
while (len > 0 && sg) {
if (sg_dma_len(sg) == 0) {
sg = sg_next(sg);
continue;
}
rctx->t_src[i].addr = sg_dma_address(sg);
todo = min(len, sg_dma_len(sg));
rctx->t_src[i].len = todo / 4;
len -= todo;
rctx->t_dst[i].addr = addr_res;
rctx->t_dst[i].len = digestsize / 4;
sg = sg_next(sg);
i++;
}
if (len > 0) {
dev_err(ss->dev, "remaining len %d\n", len);