tree a4940a436eb0292f09a9e9c09d7bfccfc5a0d76f
parent 2edcd4ca43df3c1d1d392753531cc73a53e709ba
author Eric Dumazet <eric.dumazet@gmail.com> 1320274064 +0000
committer David S. Miller <davem@davemloft.net> 1320357733 -0400

l2tp: fix race in l2tp_recv_dequeue()

Misha Labjuk reported panics occurring in l2tp_recv_dequeue()

If we release reorder_q.lock, we must not keep a dangling pointer (tmp),
since another thread could manipulate reorder_q.

Instead we must restart the scan at beginning of list.

Reported-by: Misha Labjuk <spiked.yar@gmail.com>
Tested-by: Misha Labjuk <spiked.yar@gmail.com>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>