On Mon, Jul 26, 2021 at 11:25 PM Dongliang Mu <mudongliangabcd@xxxxxxxxx> wrote:
>
> In sun8i_ss_hash_run, all the dma_mmap_sg/single will cause memory leak
> due to no corresponding unmap operation if errors happen.
>
> Fix this by adding error handling part for all the dma_mmap_sg/single.
>
> Fixes: d9b45418a917 ("crypto: sun8i-ss - support hash algorithms")
> Signed-off-by: Dongliang Mu <mudongliangabcd@xxxxxxxxx>
> ---
> v1->v2: move crypto_finalize_hash_request to the end of function; move
> the memcpy after the dma_mmap_sg/single functions.
> v2->v3: remove some unrelated code changes; delete the fix of return value
> since there is no corresponding handling code
> v3->v4: change sun8i_ce to sun8i_ss
>From v3 to v4, I changed the title and commit message from sun8i_ce to
sun8i_ss because I suddenly realized that the code change below is for
sun8i_ss_hash_run, other than sun8i_ce_hash_run.
Furthermore, sun8i_ce is also prone to this issue. I've sent another
patch to fix it.
> drivers/crypto/allwinner/sun8i-ss/sun8i-ss-hash.c | 15 ++++++++-------
> 1 file changed, 8 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/crypto/allwinner/sun8i-ss/sun8i-ss-hash.c b/drivers/crypto/allwinner/sun8i-ss/sun8i-ss-hash.c
> index 3c073eb3db03..5448705e8ae1 100644
> --- a/drivers/crypto/allwinner/sun8i-ss/sun8i-ss-hash.c
> +++ b/drivers/crypto/allwinner/sun8i-ss/sun8i-ss-hash.c
> @@ -368,14 +368,14 @@ int sun8i_ss_hash_run(struct crypto_engine *engine, void *breq)
> if (nr_sgs <= 0 || nr_sgs > MAX_SG) {
> dev_err(ss->dev, "Invalid sg number %d\n", nr_sgs);
> err = -EINVAL;
> - goto theend;
> + goto err_result;
> }
>
> addr_res = dma_map_single(ss->dev, result, digestsize, DMA_FROM_DEVICE);
> if (dma_mapping_error(ss->dev, addr_res)) {
> dev_err(ss->dev, "DMA map dest\n");
> err = -EINVAL;
> - goto theend;
> + goto err_unmap_sg;
> }
>
> len = areq->nbytes;
> @@ -390,7 +390,7 @@ int sun8i_ss_hash_run(struct crypto_engine *engine, void *breq)
> if (len > 0) {
> dev_err(ss->dev, "remaining len %d\n", len);
> err = -EINVAL;
> - goto theend;
> + goto err_addr_res;
> }
>
> byte_count = areq->nbytes;
> @@ -428,18 +428,19 @@ int sun8i_ss_hash_run(struct crypto_engine *engine, void *breq)
> if (dma_mapping_error(ss->dev, addr_pad)) {
> dev_err(ss->dev, "DMA error on padding SG\n");
> err = -EINVAL;
> - goto theend;
> + goto err_addr_res;
> }
>
> err = sun8i_ss_run_hash_task(ss, rctx, crypto_tfm_alg_name(areq->base.tfm));
>
> dma_unmap_single(ss->dev, addr_pad, j * 4, DMA_TO_DEVICE);
> +err_addr_res:
> + dma_unmap_single(ss->dev, addr_res, digestsize, DMA_FROM_DEVICE);
> +err_unmap_sg:
> dma_unmap_sg(ss->dev, areq->src, sg_nents(areq->src),
> DMA_TO_DEVICE);
> - dma_unmap_single(ss->dev, addr_res, digestsize, DMA_FROM_DEVICE);
> -
> memcpy(areq->result, result, algt->alg.hash.halg.digestsize);
> -theend:
> +err_result:
> kfree(pad);
> kfree(result);
> crypto_finalize_hash_request(engine, breq, err);
> --
> 2.25.1
>
