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net/x25: Fix null-ptr-deref caused by x25_disconnect

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When the link layer is terminating, x25->neighbour will be set to NULL
in x25_disconnect(). As a result, it could cause null-ptr-deref bugs in
x25_sendmsg(),x25_recvmsg() and x25_connect(). One of the bugs is
shown below.

    (Thread 1)                 |  (Thread 2)
x25_link_terminated()          | x25_recvmsg()
 x25_kill_by_neigh()           |  ...
  x25_disconnect()             |  lock_sock(sk)
   ...                         |  ...
   x25->neighbour = NULL //(1) |
   ...                         |  x25->neighbour->extended //(2)

The code sets NULL to x25->neighbour in position (1) and dereferences
x25->neighbour in position (2), which could cause null-ptr-deref bug.

This patch adds lock_sock() in x25_kill_by_neigh() in order to synchronize
with x25_sendmsg(), x25_recvmsg() and x25_connect(). What`s more, the
sock held by lock_sock() is not NULL, because it is extracted from x25_list
and uses x25_list_lock to synchronize.

Fixes: 4becb7ee5b ("net/x25: Fix x25_neigh refcnt leak when x25 disconnect")
Signed-off-by: Duoming Zhou <duoming@zju.edu.cn>
Reviewed-by: Lin Ma <linma@zju.edu.cn>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Duoming Zhou 2022-03-26 18:43:46 +08:00 committed by David S. Miller
parent 1521db37f0
commit 7781607938
1 changed files with 8 additions and 3 deletions
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11
net/x25/af_x25.c
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@ -1765,10 +1765,15 @@ void x25_kill_by_neigh(struct x25_neigh *nb)
write_lock_bh(&x25_list_lock);
sk_for_each(s, &x25_list)
if (x25_sk(s)->neighbour == nb)
sk_for_each(s, &x25_list) {
if (x25_sk(s)->neighbour == nb) {
write_unlock_bh(&x25_list_lock);
lock_sock(s);
x25_disconnect(s, ENETUNREACH, 0, 0);
release_sock(s);
write_lock_bh(&x25_list_lock);
}
}
write_unlock_bh(&x25_list_lock);
/* Remove any related forwards */