net: fix a kernel infoleak in x25 module

net: fix a kernel infoleak in x25 module

Orabug: 25308086

[ Upstream commit 79e48650320e6fba48369fccf13fd045315b19b8 ]

Stack object "dte_facilities" is allocated in x25_rx_call_request(),
which is supposed to be initialized in x25_negotiate_facilities.
However, 5 fields (8 bytes in total) are not initialized. This
object is then copied to userland via copy_to_user, thus infoleak
occurs.

Signed-off-by: Kangjie Lu <kjlu@gatech.edu>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
(cherry picked from commit b2b95b3fbd93c910210922809f6c4d24be172b1c)
Signed-off-by: Dhaval Giani <dhaval.giani@oracle.com>