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net: sched: fix possible null pointer deref in tcf_block_put

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We need to check block for being null in both tcf_block_put and
tcf_block_put_ext.

Fixes: 343723dd51 ("net: sched: fix clsact init error path")
Reported-by: Prashant Bhole <bhole_prashant_q7@lab.ntt.co.jp>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jiri Pirko 2017-12-21 13:13:59 +01:00 committed by David S. Miller
parent 0a3d805c9c
commit 4853f128c1
1 changed files with 2 additions and 0 deletions
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net/sched/cls_api.c
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@ -379,6 +379,8 @@ void tcf_block_put(struct tcf_block *block)
{
struct tcf_block_ext_info ei = {0, };
if (!block)
return;
tcf_block_put_ext(block, block->q, &ei);
}