linux-kernel - [PATCH] gdrom: fix a memory leak bug

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Message-Id: <1545876914-11283-1-git-send-email-wang6495@umn.edu>
Date:   Wed, 26 Dec 2018 20:15:13 -0600
From:   Wenwen Wang <wang6495@....edu>
To:     Wenwen Wang <wang6495@....edu>
Cc:     Jens Axboe <axboe@...nel.dk>,
        Maurizio Lombardi <mlombard@...hat.com>,
        zhong jiang <zhongjiang@...wei.com>,
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH] gdrom: fix a memory leak bug

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>
---
 drivers/cdrom/gdrom.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/cdrom/gdrom.c b/drivers/cdrom/gdrom.c
index a5b8afe..f8b7345 100644
--- a/drivers/cdrom/gdrom.c
+++ b/drivers/cdrom/gdrom.c
@@ -873,6 +873,7 @@ 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);
-- 
2.7.4