linux-kernel - [PATCH][next] crypto: sun8i-ss: Fix memory leak of pad

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Date:   Thu,  1 Apr 2021 16:18:27 +0100
From:   Colin King <colin.king@...onical.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@...l.net>,
        linux-crypto@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH][next] crypto: sun8i-ss: Fix memory leak of pad

From: Colin Ian King <colin.king@...onical.com>

It appears there are several failure return paths that don't seem
to be free'ing pad. Fix these.

Addresses-Coverity: ("Resource leak")
Fixes: d9b45418a917 ("crypto: sun8i-ss - support hash algorithms")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 drivers/crypto/allwinner/sun8i-ss/sun8i-ss-hash.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/crypto/allwinner/sun8i-ss/sun8i-ss-hash.c b/drivers/crypto/allwinner/sun8i-ss/sun8i-ss-hash.c
index 7d1fc9aba665..3c073eb3db03 100644
--- a/drivers/crypto/allwinner/sun8i-ss/sun8i-ss-hash.c
+++ b/drivers/crypto/allwinner/sun8i-ss/sun8i-ss-hash.c
@@ -348,8 +348,10 @@ int sun8i_ss_hash_run(struct crypto_engine *engine, void *breq)
 	bf = (__le32 *)pad;
 
 	result = kzalloc(digestsize, GFP_KERNEL | GFP_DMA);
-	if (!result)
+	if (!result) {
+		kfree(pad);
 		return -ENOMEM;
+	}
 
 	for (i = 0; i < MAX_SG; i++) {
 		rctx->t_dst[i].addr = 0;
@@ -436,10 +438,9 @@ int sun8i_ss_hash_run(struct crypto_engine *engine, void *breq)
 		     DMA_TO_DEVICE);
 	dma_unmap_single(ss->dev, addr_res, digestsize, DMA_FROM_DEVICE);
 
-	kfree(pad);
-
 	memcpy(areq->result, result, algt->alg.hash.halg.digestsize);
 theend:
+	kfree(pad);
 	kfree(result);
 	crypto_finalize_hash_request(engine, breq, err);
 	return 0;
-- 
2.30.2