linux-kernel - [PATCH v4] crypto: sun8i-ss: fix multiple memory leaks in sun8i_ss_hash

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Message-Id: <20210726152533.2281139-1-mudongliangabcd@gmail.com>
Date:   Mon, 26 Jul 2021 23:25:21 +0800
From:   Dongliang Mu <mudongliangabcd@...il.com>
To:     Corentin Labbe <clabbe.montjoie@...il.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        Maxime Ripard <mripard@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Ard Biesheuvel <ardb@...nel.org>,
        Xiang Chen <chenxiang66@...ilicon.com>,
        Eric Biggers <ebiggers@...gle.com>,
        Dongliang Mu <mudongliangabcd@...il.com>,
        Colin Ian King <colin.king@...onical.com>
Cc:     linux-crypto@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-sunxi@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: [PATCH v4] crypto: sun8i-ss: fix multiple memory leaks in sun8i_ss_hash_run

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@...il.com>
---
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
 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