From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Sat, 22 May 2010 20:37:44 +0000 (+0000)
Subject: net_sched: Fix qdisc_notify()
X-Git-Tag: v2.6.35-rc1~260^2~31
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=53b0f08042f04813cd1a7473dacd3edfacb28eb3;p=pandora-kernel.git

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>
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