Check that filter is not NULL before passing it to tcf_walker->fn()
callback. This can happen when mall_change() failed to offload filter to
hardware.
Fixes: ed76f5edccc9 ("net: sched: protect filter_chain list with
filter_chain_lock mutex")
Reported-by: Ido Schimmel <ido...@mellanox.com>
Tested-by: Ido Schimmel <ido...@mellanox.com>
Signed-off-by: Vlad Buslov <vla...@mellanox.com>
---
net/sched/cls_matchall.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/net/sched/cls_matchall.c b/net/sched/cls_matchall.c
index a37137430e61..1f9d481b0fbb 100644
--- a/net/sched/cls_matchall.c
+++ b/net/sched/cls_matchall.c
@@ -247,6 +247,9 @@ static void mall_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;
skip:
--
2.13.6
