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authorVlad Buslov <vladbu@mellanox.com>2019-02-15 17:18:44 +0200
committerDavid S. Miller <davem@davemloft.net>2019-02-17 13:26:57 -0800
commit8b58d12f4ae1a10037b824b1fb409cf424d6aaac (patch)
treebdb529b1eae848320e967f01eb082ec5cd4430f0 /net/sched/cls_cgroup.c
parentnet: sched: matchall: verify that filter is not NULL in mall_walk() (diff)
downloadlinux-dev-8b58d12f4ae1a10037b824b1fb409cf424d6aaac.tar.xz
linux-dev-8b58d12f4ae1a10037b824b1fb409cf424d6aaac.zip
net: sched: cgroup: verify that filter is not NULL during walk
Check that filter is not NULL before passing it to tcf_walker->fn() callback in cls_cgroup_walk(). This can happen when cls_cgroup_change() failed to set first filter. Fixes: ed76f5edccc9 ("net: sched: protect filter_chain list with filter_chain_lock mutex") Signed-off-by: Vlad Buslov <vladbu@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to '')
-rw-r--r--net/sched/cls_cgroup.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/net/sched/cls_cgroup.c b/net/sched/cls_cgroup.c
index 1cef3b416094..02b05066b635 100644
--- a/net/sched/cls_cgroup.c
+++ b/net/sched/cls_cgroup.c
@@ -158,6 +158,8 @@ static void cls_cgroup_walk(struct tcf_proto *tp, struct tcf_walker *arg,
if (arg->count < arg->skip)
goto skip;
+ if (!head)
+ return;
if (arg->fn(tp, head, arg) < 0) {
arg->stop = 1;
return;