linux-kernel - [PATCH AUTOSEL 4.4 75/80] gdrom: fix a memory leak bug

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Message-Id: <20190128162401.58841-75-sashal@kernel.org>
Date:   Mon, 28 Jan 2019 11:23:56 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Wenwen Wang <wang6495@....edu>, Jens Axboe <axboe@...nel.dk>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH AUTOSEL 4.4 75/80] gdrom: fix a memory leak bug

From: Wenwen Wang <wang6495@....edu>

[ Upstream commit 093c48213ee37c3c3ff1cf5ac1aa2a9d8bc66017 ]

In probe_gdrom(), the buffer pointed by 'gd.cd_info' is allocated through
kzalloc() and is used to hold the information of the gdrom device. To
register and unregister the device, the pointer 'gd.cd_info' is passed to
the functions register_cdrom() and unregister_cdrom(), respectively.
However, this buffer is not freed after it is used, which can cause a
memory leak bug.

This patch simply frees the buffer 'gd.cd_info' in exit_gdrom() to fix the
above issue.

Signed-off-by: Wenwen Wang <wang6495@....edu>
Signed-off-by: Jens Axboe <axboe@...nel.dk>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/cdrom/gdrom.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/cdrom/gdrom.c b/drivers/cdrom/gdrom.c
index e2808fefbb78..1852d19d0d7b 100644
--- a/drivers/cdrom/gdrom.c
+++ b/drivers/cdrom/gdrom.c
@@ -882,6 +882,7 @@ static void __exit exit_gdrom(void)
 	platform_device_unregister(pd);
 	platform_driver_unregister(&gdrom_driver);
 	kfree(gd.toc);
+	kfree(gd.cd_info);
 }

 module_init(init_gdrom);
-- 
2.19.1