tree 025244cdb7c4f0872f372564de2b82130fc7e867
parent a6c0f8217c17d46da22fa56923f3cbd03615cb7c
author Eric Dumazet <eric.dumazet@gmail.com> 1274560664 +0000
committer David S. Miller <davem@davemloft.net> 1274681467 -0700

net_sched: Fix qdisc_notify()

Ben Pfaff reported a kernel oops and provided a test program to
reproduce it.

https://kerneltrap.org/mailarchive/linux-netdev/2010/5/21/6277805

tc_fill_qdisc() should not be called for builtin qdisc, or it
dereference a NULL pointer to get device ifindex.

Fix is to always use tc_qdisc_dump_ignore() before calling
tc_fill_qdisc().

Reported-by: Ben Pfaff <blp@nicira.com>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>