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From:   Dongliang Mu <mudongliangabcd@gmail.com>
To:     Corentin Labbe <clabbe.montjoie@gmail.com>,
        Herbert Xu <herbert@gondor.apana.org.au>,
        "David S. Miller" <davem@davemloft.net>,
        Maxime Ripard <mripard@kernel.org>,
        Chen-Yu Tsai <wens@csie.org>,
        Jernej Skrabec <jernej.skrabec@gmail.com>,
        "Jason A. Donenfeld" <Jason@zx2c4.com>,
        Eric Biggers <ebiggers@google.com>,
        Colin Ian King <colin.king@canonical.com>,
        Dongliang Mu <mudongliangabcd@gmail.com>,
        Xiang Chen <chenxiang66@hisilicon.com>
Cc:     Ard Biesheuvel <ardb@kernel.org>, linux-crypto@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org, linux-sunxi@lists.linux.dev,
        linux-kernel@vger.kernel.org
Subject: [PATCH v2] crypto: sun8i-ce: fix memory leak and return value of sun8i_ce_hash_run
Date:   Mon, 26 Jul 2021 15:59:36 +0800
Message-Id: <20210726075957.2231287-1-mudongliangabcd@gmail.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

This patch fixes some memory leak caused by dma_mmap_sg/single
in the error handling code. In addition, it fixes the return value
when errors related with dma_mmap_sg/single occur.

Reported-by: Dongliang Mu <mudongliangabcd@gmail.com>
Fixes: 732b764099f65 ("crypto: sun8i-ce - fix two error path's memory leak")
Signed-off-by: Dongliang Mu <mudongliangabcd@gmail.com>
---
v1->v2: move crypto_finalize_hash_request to the end of function; move
the memcpy after the dma_mmap_sg/single functions. 
 .../crypto/allwinner/sun8i-ss/sun8i-ss-hash.c | 28 +++++++++----------
 1 file changed, 14 insertions(+), 14 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..fe5db3c84754 100644
--- a/drivers/crypto/allwinner/sun8i-ss/sun8i-ss-hash.c
+++ b/drivers/crypto/allwinner/sun8i-ss/sun8i-ss-hash.c
@@ -324,11 +324,10 @@ int sun8i_ss_hash_run(struct crypto_engine *engine, void *breq)
 	struct sun8i_ss_alg_template *algt;
 	struct sun8i_ss_dev *ss;
 	struct scatterlist *sg;
-	int nr_sgs, err, digestsize;
+	int j, i, todo, nr_sgs, digestsize, err;
 	unsigned int len;
 	u64 fill, min_fill, byte_count;
 	void *pad, *result;
-	int j, i, todo;
 	__be64 *bebits;
 	__le64 *lebits;
 	dma_addr_t addr_res, addr_pad;
@@ -368,14 +367,14 @@ 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 +389,7 @@ 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;
@@ -421,27 +420,28 @@ int sun8i_ss_hash_run(struct crypto_engine *engine, void *breq)
 	}
 
 	addr_pad = dma_map_single(ss->dev, pad, j * 4, DMA_TO_DEVICE);
-	rctx->t_src[i].addr = addr_pad;
-	rctx->t_src[i].len = j;
-	rctx->t_dst[i].addr = addr_res;
-	rctx->t_dst[i].len = digestsize / 4;
 	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;
 	}
+	rctx->t_src[i].addr = addr_pad;
+	rctx->t_src[i].len = j;
+	rctx->t_dst[i].addr = addr_res;
+	rctx->t_dst[i].len = digestsize / 4;
 
 	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);
-	return 0;
+	return err;
 }
-- 
2.25.1