tree 4fdcb3313923315bb1d2065bbf1c2b522d8854b5
parent 45e093ae2830cd1264677d47ff9a95a71f5d9f9c
author Herbert Xu <herbert@gondor.apana.org.au> 1463390896 +0800
committer David S. Miller <davem@davemloft.net> 1463450715 -0400

netlink: Fix dump skb leak/double free

When we free cb->skb after a dump, we do it after releasing the
lock.  This means that a new dump could have started in the time
being and we'll end up freeing their skb instead of ours.

This patch saves the skb and module before we unlock so we free
the right memory.

Fixes: 16b304f3404f ("netlink: Eliminate kmalloc in netlink dump operation.")
Reported-by: Baozeng Ding <sploving1@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Acked-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>