linux-kernel - [PATCH AUTOSEL 5.19 18/63] staging: vt6655: fix potential memory leak

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Message-Id: <20221013001842.1893243-18-sashal@kernel.org>
Date:   Wed, 12 Oct 2022 20:17:52 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Nam Cao <namcaov@...il.com>,
        Philipp Hortmann <philipp.g.hortmann@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Sasha Levin <sashal@...nel.org>, forest@...ttletooquiet.net,
        tomm.merciai@...il.com, linux-staging@...ts.linux.dev
Subject: [PATCH AUTOSEL 5.19 18/63] staging: vt6655: fix potential memory leak

From: Nam Cao <namcaov@...il.com>

[ Upstream commit c8ff91535880d41b49699b3829fb6151942de29e ]

In function device_init_td0_ring, memory is allocated for member
td_info of priv->apTD0Rings[i], with i increasing from 0. In case of
allocation failure, the memory is freed in reversed order, with i
decreasing to 0. However, the case i=0 is left out and thus memory is
leaked.

Modify the memory freeing loop to include the case i=0.

Tested-by: Philipp Hortmann <philipp.g.hortmann@...il.com>
Signed-off-by: Nam Cao <namcaov@...il.com>
Link: https://lore.kernel.org/r/20220909141338.19343-1-namcaov@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/staging/vt6655/device_main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/vt6655/device_main.c b/drivers/staging/vt6655/device_main.c
index afaf331fe125..3006eeb87ec6 100644
--- a/drivers/staging/vt6655/device_main.c
+++ b/drivers/staging/vt6655/device_main.c
@@ -675,7 +675,7 @@ static int device_init_td0_ring(struct vnt_private *priv)
 	return 0;
 
 err_free_desc:
-	while (--i) {
+	while (i--) {
 		desc = &priv->apTD0Rings[i];
 		kfree(desc->td_info);
 	}
-- 
2.35.1