linux-kernel - [PATCH] Fix dereferencing freed memory 'fw'

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Message-ID: <20240922105212.28099-1-kdipendra88@gmail.com>
Date: Sun, 22 Sep 2024 10:52:11 +0000
From: Dipendra Khadka <kdipendra88@...il.com>
To: heikki.krogerus@...ux.intel.com,
	gregkh@...uxfoundation.org
Cc: Dipendra Khadka <kdipendra88@...il.com>,
	linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] Fix  dereferencing freed memory 'fw'

smatch reported dereferencing freed memory as below:
'''
drivers/usb/typec/tipd/core.c:1196 tps6598x_apply_patch() error: dereferencing freed memory 'fw'
'''

Invoking release_firware(fw) just after checking ret.

Signed-off-by: Dipendra Khadka <kdipendra88@...il.com>
---
 drivers/usb/typec/tipd/core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/typec/tipd/core.c b/drivers/usb/typec/tipd/core.c
index ea768b19a7f1..eb5596e3406a 100644
--- a/drivers/usb/typec/tipd/core.c
+++ b/drivers/usb/typec/tipd/core.c
@@ -1191,11 +1191,11 @@ static int tps6598x_apply_patch(struct tps6598x *tps)
 	dev_info(tps->dev, "Firmware update succeeded\n");
 
 release_fw:
-	release_firmware(fw);
 	if (ret) {
 		dev_err(tps->dev, "Failed to write patch %s of %zu bytes\n",
 			firmware_name, fw->size);
 	}
+	release_firmware(fw);
 
 	return ret;
 };
-- 
2.43.0