linux-kernel - [PATCH 4.14 48/69] test_firmware: fix a memory leak bug

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Date:   Wed, 14 Aug 2019 19:01:46 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Wenwen Wang <wenwen@...uga.edu>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.14 48/69] test_firmware: fix a memory leak bug

[ Upstream commit d4fddac5a51c378c5d3e68658816c37132611e1f ]

In test_firmware_init(), the buffer pointed to by the global pointer
'test_fw_config' is allocated through kzalloc(). Then, the buffer is
initialized in __test_firmware_config_init(). In the case that the
initialization fails, the following execution in test_firmware_init() needs
to be terminated with an error code returned to indicate this failure.
However, the allocated buffer is not freed on this execution path, leading
to a memory leak bug.

To fix the above issue, free the allocated buffer before returning from
test_firmware_init().

Signed-off-by: Wenwen Wang <wenwen@...uga.edu>
Link: https://lore.kernel.org/r/1563084696-6865-1-git-send-email-wang6495@umn.edu
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 lib/test_firmware.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/lib/test_firmware.c b/lib/test_firmware.c
index f978aebe60c5b..2e5e18bbfd28e 100644
--- a/lib/test_firmware.c
+++ b/lib/test_firmware.c
@@ -895,8 +895,11 @@ static int __init test_firmware_init(void)
 		return -ENOMEM;

 	rc = __test_firmware_config_init();
-	if (rc)
+	if (rc) {
+		kfree(test_fw_config);
+		pr_err("could not init firmware test config: %d\n", rc);
 		return rc;
+	}

 	rc = misc_register(&test_fw_misc_device);
 	if (rc) {
-- 
2.20.1