linux-kernel - [PATCH v2] crypto: sun8i-ce: fix multiple memory leaks in sun8i_ce_hash

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Date:   Tue,  3 Aug 2021 14:31:38 +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>,
        Eric Biggers <ebiggers@...gle.com>,
        Xiang Chen <chenxiang66@...ilicon.com>,
        Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        Dongliang Mu <mudongliangabcd@...il.com>
Cc:     Corentin Labbe <clabbe@...libre.com>,
        "Jason A. Donenfeld" <Jason@...c4.com>,
        Ard Biesheuvel <ardb@...nel.org>, linux-crypto@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-sunxi@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2] crypto: sun8i-ce: fix multiple memory leaks in sun8i_ce_hash_run

In sun8i_ce_hash_run, all the dma_mmap_sg/single will cause memory leak
due to no corresponding unmap operation if errors happen.

Fix this by freeing the objects allocated bydma_mmap_sg/single
when errors occur.

Fixes: 56f6d5aee88d ("crypto: sun8i-ce - support hash algorithms")
Signed-off-by: Dongliang Mu <mudongliangabcd@...il.com>
---
v1->v2: fix some wording and keep error handling code consistent
 .../crypto/allwinner/sun8i-ce/sun8i-ce-hash.c | 27 ++++++++++---------
 1 file changed, 15 insertions(+), 12 deletions(-)

diff --git a/drivers/crypto/allwinner/sun8i-ce/sun8i-ce-hash.c b/drivers/crypto/allwinner/sun8i-ce/sun8i-ce-hash.c
index 88194718a806..05bb781da701 100644
--- a/drivers/crypto/allwinner/sun8i-ce/sun8i-ce-hash.c
+++ b/drivers/crypto/allwinner/sun8i-ce/sun8i-ce-hash.c
@@ -288,14 +288,14 @@ int sun8i_ce_hash_run(struct crypto_engine *engine, void *breq)
 	buf = kzalloc(bs * 2, GFP_KERNEL | GFP_DMA);
 	if (!buf) {
 		err = -ENOMEM;
-		goto theend;
+		goto out;
 	}
 	bf = (__le32 *)buf;
 
 	result = kzalloc(digestsize, GFP_KERNEL | GFP_DMA);
 	if (!result) {
 		err = -ENOMEM;
-		goto theend;
+		goto err_buf;
 	}
 
 	flow = rctx->flow;
@@ -321,7 +321,7 @@ int sun8i_ce_hash_run(struct crypto_engine *engine, void *breq)
 	if (nr_sgs <= 0 || nr_sgs > MAX_SG) {
 		dev_err(ce->dev, "Invalid sg number %d\n", nr_sgs);
 		err = -EINVAL;
-		goto theend;
+		goto err_result;
 	}
 
 	len = areq->nbytes;
@@ -334,7 +334,7 @@ int sun8i_ce_hash_run(struct crypto_engine *engine, void *breq)
 	if (len > 0) {
 		dev_err(ce->dev, "remaining len %d\n", len);
 		err = -EINVAL;
-		goto theend;
+		goto err_unmap_sg;
 	}
 	addr_res = dma_map_single(ce->dev, result, digestsize, DMA_FROM_DEVICE);
 	cet->t_dst[0].addr = cpu_to_le32(addr_res);
@@ -342,7 +342,7 @@ int sun8i_ce_hash_run(struct crypto_engine *engine, void *breq)
 	if (dma_mapping_error(ce->dev, addr_res)) {
 		dev_err(ce->dev, "DMA map dest\n");
 		err = -EINVAL;
-		goto theend;
+		goto err_unmap_sg;
 	}
 
 	byte_count = areq->nbytes;
@@ -392,7 +392,7 @@ int sun8i_ce_hash_run(struct crypto_engine *engine, void *breq)
 	if (dma_mapping_error(ce->dev, addr_pad)) {
 		dev_err(ce->dev, "DMA error on padding SG\n");
 		err = -EINVAL;
-		goto theend;
+		goto err_addr_res;
 	}
 
 	if (ce->variant->hash_t_dlen_in_bits)
@@ -405,15 +405,18 @@ int sun8i_ce_hash_run(struct crypto_engine *engine, void *breq)
 	err = sun8i_ce_run_task(ce, flow, crypto_tfm_alg_name(areq->base.tfm));
 
 	dma_unmap_single(ce->dev, addr_pad, j * 4, DMA_TO_DEVICE);
+err_addr_res:
+	dma_unmap_single(ce->dev, addr_res, digestsize, DMA_FROM_DEVICE);
+err_unmap_sg:
 	dma_unmap_sg(ce->dev, areq->src, sg_nents(areq->src),
 		     DMA_TO_DEVICE);
-	dma_unmap_single(ce->dev, addr_res, digestsize, DMA_FROM_DEVICE);
-
-
 	memcpy(areq->result, result, algt->alg.hash.halg.digestsize);
-theend:
-	kfree(buf);
+err_result:
 	kfree(result);
-	crypto_finalize_hash_request(engine, breq, err);
+err_buf:
+	kfree(buf);
+out:
+	if (!err)
+		crypto_finalize_hash_request(engine, breq, err);
 	return 0;
 }
-- 
2.25.1