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* [PATCH v1] Bluetooth: RFCOMM: FIX possible deadlock in rfcomm_sk_state_change
@ 2024-09-30 19:30 Luiz Augusto von Dentz
  2024-09-30 20:36 ` Luiz Augusto von Dentz
  2024-10-01 16:10 ` [PATCH v1] Bluetooth: RFCOMM: FIX " patchwork-bot+bluetooth
  0 siblings, 2 replies; 5+ messages in thread
From: Luiz Augusto von Dentz @ 2024-09-30 19:30 UTC (permalink / raw)
  To: linux-bluetooth

From: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

rfcomm_sk_state_change attempts to use sock_lock so it must never be
called with it locked but rfcomm_sock_ioctl always attempt to lock it
causing the following trace:

======================================================
WARNING: possible circular locking dependency detected
6.8.0-syzkaller-08951-gfe46a7dd189e #0 Not tainted
------------------------------------------------------
syz-executor386/5093 is trying to acquire lock:
ffff88807c396258 (sk_lock-AF_BLUETOOTH-BTPROTO_RFCOMM){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1671 [inline]
ffff88807c396258 (sk_lock-AF_BLUETOOTH-BTPROTO_RFCOMM){+.+.}-{0:0}, at: rfcomm_sk_state_change+0x5b/0x310 net/bluetooth/rfcomm/sock.c:73

but task is already holding lock:
ffff88807badfd28 (&d->lock){+.+.}-{3:3}, at: __rfcomm_dlc_close+0x226/0x6a0 net/bluetooth/rfcomm/core.c:491

Reported-by: syzbot+d7ce59b06b3eb14fd218@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=d7ce59b06b3eb14fd218
Fixes: 3241ad820dbb ("[Bluetooth] Add timestamp support to L2CAP, RFCOMM and SCO")
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
---
 net/bluetooth/rfcomm/sock.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/net/bluetooth/rfcomm/sock.c b/net/bluetooth/rfcomm/sock.c
index 37d63d768afb..f48250e3f2e1 100644
--- a/net/bluetooth/rfcomm/sock.c
+++ b/net/bluetooth/rfcomm/sock.c
@@ -865,9 +865,7 @@ static int rfcomm_sock_ioctl(struct socket *sock, unsigned int cmd, unsigned lon
 
 	if (err == -ENOIOCTLCMD) {
 #ifdef CONFIG_BT_RFCOMM_TTY
-		lock_sock(sk);
 		err = rfcomm_dev_ioctl(sk, cmd, (void __user *) arg);
-		release_sock(sk);
 #else
 		err = -EOPNOTSUPP;
 #endif
-- 
2.46.1


^ permalink raw reply related	[flat|nested] 5+ messages in thread

end of thread, other threads:[~2024-10-01 16:10 UTC | newest]

Thread overview: 5+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2024-09-30 19:30 [PATCH v1] Bluetooth: RFCOMM: FIX possible deadlock in rfcomm_sk_state_change Luiz Augusto von Dentz
2024-09-30 20:36 ` Luiz Augusto von Dentz
2024-10-01 14:58   ` Luiz Augusto von Dentz
2024-10-01 15:52     ` [syzbot] [bluetooth?] " syzbot
2024-10-01 16:10 ` [PATCH v1] Bluetooth: RFCOMM: FIX " patchwork-bot+bluetooth

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