linux/include
Luiz Augusto von Dentz f1a8f402f1 Bluetooth: L2CAP: Fix deadlock
This fixes the following deadlock introduced by 39a92a55be13
("bluetooth/l2cap: sync sock recv cb and release")

============================================
WARNING: possible recursive locking detected
6.10.0-rc3-g4029dba6b6f1 #6823 Not tainted
--------------------------------------------
kworker/u5:0/35 is trying to acquire lock:
ffff888002ec2510 (&chan->lock#2/1){+.+.}-{3:3}, at:
l2cap_sock_recv_cb+0x44/0x1e0

but task is already holding lock:
ffff888002ec2510 (&chan->lock#2/1){+.+.}-{3:3}, at:
l2cap_get_chan_by_scid+0xaf/0xd0

other info that might help us debug this:
 Possible unsafe locking scenario:

       CPU0
       ----
  lock(&chan->lock#2/1);
  lock(&chan->lock#2/1);

 *** DEADLOCK ***

 May be due to missing lock nesting notation

3 locks held by kworker/u5:0/35:
 #0: ffff888002b8a940 ((wq_completion)hci0#2){+.+.}-{0:0}, at:
process_one_work+0x750/0x930
 #1: ffff888002c67dd0 ((work_completion)(&hdev->rx_work)){+.+.}-{0:0},
at: process_one_work+0x44e/0x930
 #2: ffff888002ec2510 (&chan->lock#2/1){+.+.}-{3:3}, at:
l2cap_get_chan_by_scid+0xaf/0xd0

To fix the original problem this introduces l2cap_chan_lock at
l2cap_conless_channel to ensure that l2cap_sock_recv_cb is called with
chan->lock held.

Fixes: 89e856e124 ("bluetooth/l2cap: sync sock recv cb and release")
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
2024-06-28 14:32:02 -04:00
..
acpi ACPI: EC: Evaluate orphan _REG under EC device 2024-06-13 11:28:54 +02:00
asm-generic asm-generic cleanups for 6.10 2024-05-20 15:18:34 -07:00
clocksource
crypto This push fixes a bug in the new ecc P521 code as well as a buggy 2024-05-20 08:47:54 -07:00
drm Short summary of fixes pull: 2024-05-27 13:47:14 +10:00
dt-bindings dt-bindings: net: dp8386x: Add MIT license along with GPL-2.0 2024-06-07 12:16:22 +01:00
keys
kunit
kvm
linux net/mlx5: IFC updates for changing max EQs 2024-06-28 12:58:10 +01:00
math-emu
media
memory
misc
net Bluetooth: L2CAP: Fix deadlock 2024-06-28 14:32:02 -04:00
pcmcia
ras tracing/treewide: Remove second parameter of __assign_str() 2024-05-22 20:14:47 -04:00
rdma The usual shower of singleton fixes and minor series all over MM, 2024-05-19 09:21:03 -07:00
rv
scsi scsi: core: Introduce the BLIST_SKIP_IO_HINTS flag 2024-06-13 21:03:13 -04:00
soc I'm actually surprised this time. There aren't any new Qualcomm SoC clk 2024-05-18 12:48:37 -07:00
sound ALSA: dmaengine: Synchronize dma channel after drop() 2024-06-11 17:13:31 +01:00
target
trace tracing/net_sched: NULL pointer dereference in perf_trace_qdisc_reset() 2024-06-27 11:06:30 +02:00
uapi vfs-6.10-rc4.fixes 2024-06-11 12:04:21 -07:00
ufs
vdso
video
xen