[PATCH 5.12 220/384] media: em28xx: fix memory leak

From: Greg Kroah-Hartman
Date: Mon May 10 2021 - 08:26:06 EST

From: Muhammad Usama Anjum <musamaanjum@xxxxxxxxx>

[ Upstream commit 0ae10a7dc8992ee682ff0b1752ff7c83d472eef1 ]

If some error occurs, URB buffers should also be freed. If they aren't
freed with the dvb here, the em28xx_dvb_fini call doesn't frees the URB
buffers as dvb is set to NULL. The function in which error occurs should
do all the cleanup for the allocations it had done.

Tested the patch with the reproducer provided by syzbot. This patch
fixes the memleak.

Reported-by: syzbot+889397c820fa56adf25d@xxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Muhammad Usama Anjum <musamaanjum@xxxxxxxxx>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xxxxxxxxx>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
drivers/media/usb/em28xx/em28xx-dvb.c | 1 +
1 file changed, 1 insertion(+)

diff --git a/drivers/media/usb/em28xx/em28xx-dvb.c b/drivers/media/usb/em28xx/em28xx-dvb.c
index 526424279637..471bd74667e3 100644
--- a/drivers/media/usb/em28xx/em28xx-dvb.c
+++ b/drivers/media/usb/em28xx/em28xx-dvb.c
@@ -2010,6 +2010,7 @@ ret:
return result;

+ em28xx_uninit_usb_xfer(dev, EM28XX_DIGITAL_MODE);
dev->dvb = NULL;
goto ret;