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llc: fix NULL pointer deref for SOCK_ZAPPED 

For SOCK_ZAPPED socket, we don't need to care about llc->sap,
so we should just skip these refcount functions in this case.

Fixes: f7e4367268 ("llc: hold llc_sap before release_sock()")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Cong Wang 2018-04-19 21:54:34 -07:00 committed by David S. Miller
parent 5e391dc5a8
commit 3a04ce7130
1 changed files with 12 additions and 9 deletions
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13
net/llc/af_llc.c
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@ -189,7 +189,6 @@ static int llc_ui_release(struct socket *sock)
{
struct sock *sk = sock->sk;
struct llc_sock *llc;
struct llc_sap *sap;
if (unlikely(sk == NULL))
goto out;
@ -200,15 +199,19 @@ static int llc_ui_release(struct socket *sock)
llc->laddr.lsap, llc->daddr.lsap);
if (!llc_send_disc(sk))
llc_ui_wait_for_disc(sk, sk->sk_rcvtimeo);
sap = llc->sap;
/* Hold this for release_sock(), so that llc_backlog_rcv() could still
* use it.
if (!sock_flag(sk, SOCK_ZAPPED)) {
struct llc_sap *sap = llc->sap;
/* Hold this for release_sock(), so that llc_backlog_rcv()
* could still use it.
*/
llc_sap_hold(sap);
if (!sock_flag(sk, SOCK_ZAPPED))
llc_sap_remove_socket(llc->sap, sk);
release_sock(sk);
llc_sap_put(sap);
} else {
release_sock(sk);
}
if (llc->dev)
dev_put(llc->dev);
sock_put(sk);