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Subject[PATCH] media: usb: fix memory leak in em28xx_dvb_init
Date
syzbot reported memory leak in em28xx_dvb_init()[1]
The problem was in wrong error handling after em28xx_alloc_urbs()[2] call.
In case of error allocated urbs must be freed

backtrace:
[<ffffffff8304c141>] kmalloc_array.constprop.0+0x41/0x60 include/linux/slab.h:594
[<ffffffff8304dba2>] kcalloc include/linux/slab.h:623 [inline]
[<ffffffff8304dba2>] em28xx_alloc_urbs+0x102/0x550 drivers/media/usb/em28xx/em28xx-core.c:930 [2]
[<ffffffff84279fa7>] em28xx_dvb_init drivers/media/usb/em28xx/em28xx-dvb.c:1517 [inline] [1]
[<ffffffff84279fa7>] em28xx_dvb_init.cold+0xa3/0x2bb1 drivers/media/usb/em28xx/em28xx-dvb.c:1483
[<ffffffff8304e33b>] em28xx_init_extension+0x9b/0xe0 drivers/media/usb/em28xx/em28xx-core.c:1126
[<ffffffff83050143>] request_module_async+0x33/0x40 drivers/media/usb/em28xx/em28xx-cards.c:3406
[<ffffffff81259229>] process_one_work+0x2c9/0x600 kernel/workqueue.c:2275
[<ffffffff81259dbb>] process_scheduled_works kernel/workqueue.c:2337 [inline]
[<ffffffff81259dbb>] worker_thread+0x2fb/0x5d0 kernel/workqueue.c:2426
[<ffffffff81261228>] kthread+0x178/0x1b0 kernel/kthread.c:292
[<ffffffff8100227f>] ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

Reported-by: syzbot+889397c820fa56adf25d@syzkaller.appspotmail.com
Signed-off-by: Pavel Skripkin <paskripkin@gmail.com>
---
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 @@ static int em28xx_dvb_init(struct em28xx *dev)
return result;

out_free:
+ em28xx_uninit_usb_xfer(dev, EM28XX_DIGITAL_MODE);
kfree(dvb);
dev->dvb = NULL;
goto ret;
--
2.30.2
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