linux-kernel - [PATCH] crypto: ccp - fix memleak in ccp_init_dm

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Date:   Thu, 23 Nov 2023 15:03:37 +0800
From:   Dinghao Liu <dinghao.liu@....edu.cn>
To:     dinghao.liu@....edu.cn
Cc:     Tom Lendacky <thomas.lendacky@....com>,
        John Allen <john.allen@....com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] crypto: ccp - fix memleak in ccp_init_dm_workarea

When dma_map_single() fails, we should free wa->address to
prevent potential memleak.

Fixes: 63b945091a07 ("crypto: ccp - CCP device driver and interface support")
Signed-off-by: Dinghao Liu <dinghao.liu@....edu.cn>
---
 drivers/crypto/ccp/ccp-ops.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/crypto/ccp/ccp-ops.c b/drivers/crypto/ccp/ccp-ops.c
index aa4e1a500691..45552ae6347e 100644
--- a/drivers/crypto/ccp/ccp-ops.c
+++ b/drivers/crypto/ccp/ccp-ops.c
@@ -179,8 +179,10 @@ static int ccp_init_dm_workarea(struct ccp_dm_workarea *wa,
 
 		wa->dma.address = dma_map_single(wa->dev, wa->address, len,
 						 dir);
-		if (dma_mapping_error(wa->dev, wa->dma.address))
+		if (dma_mapping_error(wa->dev, wa->dma.address)) {
+			kfree(wa->address);
 			return -ENOMEM;
+		}
 
 		wa->dma.length = len;
 	}
-- 
2.17.1