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net_sched: check NULL in tcf_block_put()
Callers of tcf_block_put() could pass NULL so
we can't use block->q before checking if block is
NULL or not.
tcf_block_put_ext() callers are fine, it is always
non-NULL.
Fixes: 8c4083b30e
("net: sched: add block bind/unbind notif. and extended block_get/put")
Reported-by: Dave Taht <dave.taht@gmail.com>
Cc: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Reviewed-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -340,9 +340,6 @@ void tcf_block_put_ext(struct tcf_block *block,
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{
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{
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struct tcf_chain *chain, *tmp;
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struct tcf_chain *chain, *tmp;
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if (!block)
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return;
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list_for_each_entry_safe(chain, tmp, &block->chain_list, list)
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list_for_each_entry_safe(chain, tmp, &block->chain_list, list)
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tcf_chain_flush(chain);
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tcf_chain_flush(chain);
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@ -362,6 +359,8 @@ void tcf_block_put(struct tcf_block *block)
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{
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{
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struct tcf_block_ext_info ei = {0, };
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struct tcf_block_ext_info ei = {0, };
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if (!block)
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return;
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tcf_block_put_ext(block, NULL, block->q, &ei);
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tcf_block_put_ext(block, NULL, block->q, &ei);
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}
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}
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