linux-kernel - [PATCH v6] cypto: mediatek - fix leaks in mtk_desc_ring

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Message-Id: <20200914030051.16956-1-dawning.pang@gmail.com>
Date:   Mon, 14 Sep 2020 11:00:51 +0800
From:   Xiaoliang Pang <dawning.pang@...il.com>
To:     herbert@...dor.apana.org.au, davem@...emloft.net,
        matthias.bgg@...il.com, swboyd@...omium.org, yuehaibing@...wei.com,
        tianjia.zhang@...ux.alibaba.com, ryder.lee@...iatek.com
Cc:     linux-crypto@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        dawning.pang@...il.com
Subject: [PATCH v6] cypto: mediatek - fix leaks in mtk_desc_ring_alloc

In the init loop, if an error occurs in function 'dma_alloc_coherent',
then goto the err_cleanup section, after run i--,
in the array ring, the struct mtk_ring with index i will not be released,
causing memory leaks

Fixes: 785e5c616c849 ("crypto: mediatek - Add crypto driver support for some MediaTek chips")
Cc: Ryder Lee <ryder.lee@...iatek.com>
Signed-off-by: Xiaoliang Pang <dawning.pang@...il.com>
---
 drivers/crypto/mediatek/mtk-platform.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/crypto/mediatek/mtk-platform.c b/drivers/crypto/mediatek/mtk-platform.c
index 7e3ad085b5bd..f83cead30d8f 100644
--- a/drivers/crypto/mediatek/mtk-platform.c
+++ b/drivers/crypto/mediatek/mtk-platform.c
@@ -469,13 +469,13 @@ static int mtk_desc_ring_alloc(struct mtk_cryp *cryp)
 	return 0;
 
 err_cleanup:
-	for (; i--; ) {
+	do {
 		dma_free_coherent(cryp->dev, MTK_DESC_RING_SZ,
 				  ring[i]->res_base, ring[i]->res_dma);
 		dma_free_coherent(cryp->dev, MTK_DESC_RING_SZ,
 				  ring[i]->cmd_base, ring[i]->cmd_dma);
 		kfree(ring[i]);
-	}
+	} while (i--);
 	return err;
 }
 
-- 
2.17.1