4.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Basil Gunn <basil@xxxxxxxxxxxxx>
[ Upstream commit 8a367e74c0120ef68c8c70d5a025648c96626dff ]
The ax.25 socket connection timed out & the sock struct has been
previously taken down ie. sock struct is now a NULL pointer. Checking
the sock_flag causes the segfault. Check if the socket struct pointer
is NULL before checking sock_flag. This segfault is seen in
timed out netrom connections.
Please submit to -stable.
Signed-off-by: Basil Gunn <basil@xxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/ax25/ax25_subr.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/net/ax25/ax25_subr.c
+++ b/net/ax25/ax25_subr.c
@@ -264,7 +264,7 @@ void ax25_disconnect(ax25_cb *ax25, int
{
ax25_clear_queues(ax25);
- if (!sock_flag(ax25->sk, SOCK_DESTROY))
+ if (!ax25->sk || !sock_flag(ax25->sk, SOCK_DESTROY))
ax25_stop_heartbeat(ax25);
ax25_stop_t1timer(ax25);
ax25_stop_t2timer(ax25);
--
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