From a49184c229535ebedbb659214db2d4d1d77b7c07 Mon Sep 17 00:00:00 2001 From: Andrei Emeltchenko Date: Wed, 3 Nov 2010 12:32:44 +0200 Subject: [PATCH] Bluetooth: Check sk is not owned before freeing l2cap_conn Check that socket sk is not locked in user process before removing l2cap connection handler. lock_sock and release_sock do not hold a normal spinlock directly but instead hold the owner field. This means bh_lock_sock can still execute even if the socket is "locked". More info can be found here: http://www.linuxfoundation.org/collaborate/workgroups/networking/socketlocks krfcommd kernel thread may be preempted with l2cap tasklet which remove l2cap_conn structure. If krfcommd is in process of sending of RFCOMM reply (like "RFCOMM UA" reply to "RFCOMM DISC") then kernel crash happens. ... [ 694.175933] Unable to handle kernel NULL pointer dereference at virtual address 00000000 [ 694.184936] pgd = c0004000 [ 694.187683] [00000000] *pgd=00000000 [ 694.191711] Internal error: Oops: 5 [#1] PREEMPT [ 694.196350] last sysfs file: /sys/devices/platform/hci_h4p/firmware/hci_h4p/loading [ 694.260375] CPU: 0 Not tainted (2.6.32.10 #1) [ 694.265106] PC is at l2cap_sock_sendmsg+0x43c/0x73c [l2cap] [ 694.270721] LR is at 0xd7017303 ... [ 694.525085] Backtrace: [ 694.527587] [] (l2cap_sock_sendmsg+0x0/0x73c [l2cap]) from [] (sock_sendmsg+0xb8/0xd8) [ 694.537292] [] (sock_sendmsg+0x0/0xd8) from [] (kernel_sendmsg+0x48/0x80) Signed-off-by: Andrei Emeltchenko Acked-by: Marcel Holtmann Signed-off-by: Gustavo F. Padovan --- net/bluetooth/l2cap.c | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) diff --git a/net/bluetooth/l2cap.c b/net/bluetooth/l2cap.c index cd8f6ea03841..4ed38272df78 100644 --- a/net/bluetooth/l2cap.c +++ b/net/bluetooth/l2cap.c @@ -3078,6 +3078,14 @@ static inline int l2cap_connect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hd break; default: + /* don't delete l2cap channel if sk is owned by user */ + if (sock_owned_by_user(sk)) { + sk->sk_state = BT_DISCONN; + l2cap_sock_clear_timer(sk); + l2cap_sock_set_timer(sk, HZ / 5); + break; + } + l2cap_chan_del(sk, ECONNREFUSED); break; } @@ -3283,6 +3291,15 @@ static inline int l2cap_disconnect_req(struct l2cap_conn *conn, struct l2cap_cmd sk->sk_shutdown = SHUTDOWN_MASK; + /* don't delete l2cap channel if sk is owned by user */ + if (sock_owned_by_user(sk)) { + sk->sk_state = BT_DISCONN; + l2cap_sock_clear_timer(sk); + l2cap_sock_set_timer(sk, HZ / 5); + bh_unlock_sock(sk); + return 0; + } + l2cap_chan_del(sk, ECONNRESET); bh_unlock_sock(sk); @@ -3305,6 +3322,15 @@ static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, struct l2cap_cmd if (!sk) return 0; + /* don't delete l2cap channel if sk is owned by user */ + if (sock_owned_by_user(sk)) { + sk->sk_state = BT_DISCONN; + l2cap_sock_clear_timer(sk); + l2cap_sock_set_timer(sk, HZ / 5); + bh_unlock_sock(sk); + return 0; + } + l2cap_chan_del(sk, 0); bh_unlock_sock(sk); -- GitLab