From: Oliver Neukum oneukum@suse.com
[ Upstream commit 296a193b06120aa6ae7cf5c0d7b5e5b55968026e ]
syzkaller reported an URB that should have been killed to be active. We do not understand it, but this should fix the issue if it is real.
Signed-off-by: Oliver Neukum oneukum@suse.com Reported-by: syzbot+be5b5f86a162a6c281e6@syzkaller.appspotmail.com Link: https://lore.kernel.org/r/20200507085806.5793-1-oneukum@suse.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/usb/class/usblp.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/class/usblp.c b/drivers/usb/class/usblp.c index 5e456a83779d5..b0471ce34011a 100644 --- a/drivers/usb/class/usblp.c +++ b/drivers/usb/class/usblp.c @@ -481,7 +481,8 @@ static int usblp_release(struct inode *inode, struct file *file) usb_autopm_put_interface(usblp->intf);
if (!usblp->present) /* finish cleanup from disconnect */ - usblp_cleanup(usblp); + usblp_cleanup(usblp); /* any URBs must be dead */ + mutex_unlock(&usblp_mutex); return 0; } @@ -1388,9 +1389,11 @@ static void usblp_disconnect(struct usb_interface *intf)
usblp_unlink_urbs(usblp); mutex_unlock(&usblp->mut); + usb_poison_anchored_urbs(&usblp->urbs);
if (!usblp->used) usblp_cleanup(usblp); + mutex_unlock(&usblp_mutex); }