linux-kernel - [PATCH] media: em28xx: return error on media_device

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Date: Wed, 10 Jan 2024 09:39:58 -0800
From: Nikita Zhandarovich <n.zhandarovich@...tech.ru>
To: Mauro Carvalho Chehab <mchehab@...nel.org>
CC: Nikita Zhandarovich <n.zhandarovich@...tech.ru>,
	<linux-media@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH] media: em28xx: return error on media_device_register() failure

In an unlikely case of failure in media_device_register(), release
resources and return the erroneous value. Otherwise, possible issues
with registering the device will continue to be ignored.

Found by Linux Verification Center (linuxtesting.org) with static
analysis tool SVACE.

Fixes: 37ecc7b1278f ("[media] em28xx: add media controller support")
Signed-off-by: Nikita Zhandarovich <n.zhandarovich@...tech.ru>
---
 drivers/media/usb/em28xx/em28xx-cards.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/media/usb/em28xx/em28xx-cards.c b/drivers/media/usb/em28xx/em28xx-cards.c
index 4d037c92af7c..dae731dfc569 100644
--- a/drivers/media/usb/em28xx/em28xx-cards.c
+++ b/drivers/media/usb/em28xx/em28xx-cards.c
@@ -4095,6 +4095,8 @@ static int em28xx_usb_probe(struct usb_interface *intf,
 	 */
 #ifdef CONFIG_MEDIA_CONTROLLER
 	retval = media_device_register(dev->media_dev);
+	if (retval)
+		goto err_free;
 #endif
 
 	return 0;