On Fri, May 14, 2021 at 08:34:25PM +0800, Dongliang Mu wrote:
> uss720_probe forgets to decrease the refcount of usbdev in uss720_probe.
> Fix this by decreasing the refcount of usbdev by usb_put_dev.
>
> BUG: memory leak
> unreferenced object 0xffff888101113800 (size 2048):
> comm "kworker/0:1", pid 7, jiffies 4294956777 (age 28.870s)
> hex dump (first 32 bytes):
> ff ff ff ff 31 00 00 00 00 00 00 00 00 00 00 00 ....1...........
> 00 00 00 00 00 00 00 00 00 00 00 00 03 00 00 00 ................
> backtrace:
> [<ffffffff82b8e822>] kmalloc include/linux/slab.h:554 [inline]
> [<ffffffff82b8e822>] kzalloc include/linux/slab.h:684 [inline]
> [<ffffffff82b8e822>] usb_alloc_dev+0x32/0x450 drivers/usb/core/usb.c:582
> [<ffffffff82b98441>] hub_port_connect drivers/usb/core/hub.c:5129 [inline]
> [<ffffffff82b98441>] hub_port_connect_change drivers/usb/core/hub.c:5363 [inline]
> [<ffffffff82b98441>] port_event drivers/usb/core/hub.c:5509 [inline]
> [<ffffffff82b98441>] hub_event+0x1171/0x20c0 drivers/usb/core/hub.c:5591
> [<ffffffff81259229>] process_one_work+0x2c9/0x600 kernel/workqueue.c:2275
> [<ffffffff81259b19>] worker_thread+0x59/0x5d0 kernel/workqueue.c:2421
> [<ffffffff81261228>] kthread+0x178/0x1b0 kernel/kthread.c:292
> [<ffffffff8100227f>] ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
>
> Reported-by: syzbot+636c58f40a86b4a879e7@xxxxxxxxxxxxxxxxxxxxxxxxx
> Fixes: 0f36163d3abe ("usb: fix uss720 schedule with interrupts off")
> Signed-off-by: Dongliang Mu <mudongliangabcd@xxxxxxxxx>
> ---
> drivers/usb/misc/uss720.c | 1 +
> 1 file changed, 1 insertion(+)
What changed from v1? That always goes below the --- line.
Please fix and send a v3.
thanks,
greg k-h
