net_sched: check NULL in tcf_block_put()

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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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Cong Wang 2017-11-02 17:32:08 -07:00 • committed by David S. Miller

parent f67971e683

commit 8f918d3ff4

1 changed files with 2 additions and 3 deletions

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net/sched/cls_api.c

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