From: Jeremy Sowden <jer...@azazel.net> Date: Sun, 16 Jun 2019 16:54:37 +0100
> lapb_register calls lapb_create_cb, which initializes the control- > block's ref-count to one, and __lapb_insert_cb, which increments it when > adding the new block to the list of blocks. > > lapb_unregister calls __lapb_remove_cb, which decrements the ref-count > when removing control-block from the list of blocks, and calls lapb_put > itself to decrement the ref-count before returning. > > However, lapb_unregister also calls __lapb_devtostruct to look up the > right control-block for the given net_device, and __lapb_devtostruct > also bumps the ref-count, which means that when lapb_unregister returns > the ref-count is still 1 and the control-block is leaked. > > Call lapb_put after __lapb_devtostruct to fix leak. > > Reported-by: syzbot+afb980676c836b4a0...@syzkaller.appspotmail.com > Signed-off-by: Jeremy Sowden <jer...@azazel.net> Applied and queued up for -stable.
