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    Subject[PATCH 5.18 622/879] crypto: sun8i-ss - handle zero sized sg
    Date
    From: Corentin Labbe <clabbe@baylibre.com>

    [ Upstream commit c149e4763d28bb4c0e5daae8a59f2c74e889f407 ]

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

    Fixes: d9b45418a917 ("crypto: sun8i-ss - support hash algorithms")
    Signed-off-by: Corentin Labbe <clabbe@baylibre.com>
    Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    drivers/crypto/allwinner/sun8i-ss/sun8i-ss-hash.c | 10 +++++++++-
    1 file changed, 9 insertions(+), 1 deletion(-)

    diff --git a/drivers/crypto/allwinner/sun8i-ss/sun8i-ss-hash.c b/drivers/crypto/allwinner/sun8i-ss/sun8i-ss-hash.c
    index 1a71ed49d233..ca4f280af35d 100644
    --- a/drivers/crypto/allwinner/sun8i-ss/sun8i-ss-hash.c
    +++ b/drivers/crypto/allwinner/sun8i-ss/sun8i-ss-hash.c
    @@ -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);
    --
    2.35.1


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