On Thu, Mar 22, 2012 at 09:22:18PM +0800, Ming Lei wrote: > Commit 4231d47e6fe69f061f96c98c30eaf9fb4c14b96d(net/usbnet: avoid > recursive locking in usbnet_stop()) fixes the recursive locking > problem by releasing the skb queue lock, but it makes usb_unlink_urb > racing with defer_bh, and the URB to being unlinked may be freed before > or during calling usb_unlink_urb, so use-after-free problem may be > triggerd inside usb_unlink_urb. > > The patch fixes the use-after-free problem by increasing URB > reference count with skb queue lock held before calling > usb_unlink_urb, so the URB won't be freed until return from > usb_unlink_urb. > > Cc: stable@xxxxxxxxxx > Cc: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx> > Cc: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> > Cc: Oliver Neukum <oliver@xxxxxxxxxx> > Reported-by: Dave Jones <davej@xxxxxxxxxx> > Signed-off-by: Ming Lei <tom.leiming@xxxxxxxxx> Acked-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
