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net: sched: matchall: verify that filter is not NULL in mall_walk()

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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 <idosch@mellanox.com>
Tested-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: Vlad Buslov <vladbu@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vlad Buslov 2019-02-15 17:17:56 +02:00 committed by David S. Miller
parent 3027ff41f6
commit d66022cd16
1 changed files with 3 additions and 0 deletions
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3
net/sched/cls_matchall.c
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@ -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: