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Subject[PATCH] ax25: Fix NULL pointer dereference in ax25_kill_by_device
Date
When two ax25 devices attempted to establish connection, the requester use ax25_create(),
ax25_bind() and ax25_connect() to initiate connection. The receiver use ax25_rcv() to
accept connection and use ax25_create_cb() in ax25_rcv() to create ax25_cb, but the
ax25_cb->sk is NULL. When the receiver is detaching, a NULL pointer dereference bug
caused by sock_hold(sk) in ax25_kill_by_device() will happen. The corresponding
fail log is shown below:

===============================================================
BUG: KASAN: null-ptr-deref in ax25_device_event+0xfd/0x290
Call Trace:
...
ax25_device_event+0xfd/0x290
raw_notifier_call_chain+0x5e/0x70
dev_close_many+0x174/0x220
unregister_netdevice_many+0x1f7/0xa60
unregister_netdevice_queue+0x12f/0x170
unregister_netdev+0x13/0x20
mkiss_close+0xcd/0x140
tty_ldisc_release+0xc0/0x220
tty_release_struct+0x17/0xa0
tty_release+0x62d/0x670
...

This patch add condition check in ax25_kill_by_device(). If s->sk is
NULL, it will goto if branch to kill device.

Fixes: 4e0f718daf97 ("ax25: improve the incomplete fix to avoid UAF and NPD bugs")
Reported-by: Thomas Osterried <thomas@osterried.de>
Signed-off-by: Duoming Zhou <duoming@zju.edu.cn>
---
net/ax25/af_ax25.c | 7 +++++++
1 file changed, 7 insertions(+)

diff --git a/net/ax25/af_ax25.c b/net/ax25/af_ax25.c
index d53cbb4e250..6bd09718077 100644
--- a/net/ax25/af_ax25.c
+++ b/net/ax25/af_ax25.c
@@ -87,6 +87,13 @@ static void ax25_kill_by_device(struct net_device *dev)
ax25_for_each(s, &ax25_list) {
if (s->ax25_dev == ax25_dev) {
sk = s->sk;
+ if (!sk) {
+ spin_unlock_bh(&ax25_list_lock);
+ s->ax25_dev = NULL;
+ ax25_disconnect(s, ENETUNREACH);
+ spin_lock_bh(&ax25_list_lock);
+ goto again;
+ }
sock_hold(sk);
spin_unlock_bh(&ax25_list_lock);
lock_sock(sk);
--
2.17.1
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