From: Ying Hsu yinghsu@chromium.org
commit 769bf60e17ee1a56a81e7c031192c3928312c52e upstream.
syzbot found a potential circular dependency leading to a deadlock: -> #3 (&hdev->req_lock){+.+.}-{3:3}: __mutex_lock_common+0x1b6/0x1bc2 kernel/locking/mutex.c:599 __mutex_lock kernel/locking/mutex.c:732 [inline] mutex_lock_nested+0x17/0x1c kernel/locking/mutex.c:784 hci_dev_do_close+0x3f/0x9f net/bluetooth/hci_core.c:551 hci_rfkill_set_block+0x130/0x1ac net/bluetooth/hci_core.c:935 rfkill_set_block+0x1e6/0x3b8 net/rfkill/core.c:345 rfkill_fop_write+0x2d8/0x672 net/rfkill/core.c:1274 vfs_write+0x277/0xcf5 fs/read_write.c:594 ksys_write+0x19b/0x2bd fs/read_write.c:650 do_syscall_x64 arch/x86/entry/common.c:55 [inline] do_syscall_64+0x51/0xba arch/x86/entry/common.c:93 entry_SYSCALL_64_after_hwframe+0x61/0xcb
-> #2 (rfkill_global_mutex){+.+.}-{3:3}: __mutex_lock_common+0x1b6/0x1bc2 kernel/locking/mutex.c:599 __mutex_lock kernel/locking/mutex.c:732 [inline] mutex_lock_nested+0x17/0x1c kernel/locking/mutex.c:784 rfkill_register+0x30/0x7e3 net/rfkill/core.c:1045 hci_register_dev+0x48f/0x96d net/bluetooth/hci_core.c:2622 __vhci_create_device drivers/bluetooth/hci_vhci.c:341 [inline] vhci_create_device+0x3ad/0x68f drivers/bluetooth/hci_vhci.c:374 vhci_get_user drivers/bluetooth/hci_vhci.c:431 [inline] vhci_write+0x37b/0x429 drivers/bluetooth/hci_vhci.c:511 call_write_iter include/linux/fs.h:2109 [inline] new_sync_write fs/read_write.c:509 [inline] vfs_write+0xaa8/0xcf5 fs/read_write.c:596 ksys_write+0x19b/0x2bd fs/read_write.c:650 do_syscall_x64 arch/x86/entry/common.c:55 [inline] do_syscall_64+0x51/0xba arch/x86/entry/common.c:93 entry_SYSCALL_64_after_hwframe+0x61/0xcb
-> #1 (&data->open_mutex){+.+.}-{3:3}: __mutex_lock_common+0x1b6/0x1bc2 kernel/locking/mutex.c:599 __mutex_lock kernel/locking/mutex.c:732 [inline] mutex_lock_nested+0x17/0x1c kernel/locking/mutex.c:784 vhci_send_frame+0x68/0x9c drivers/bluetooth/hci_vhci.c:75 hci_send_frame+0x1cc/0x2ff net/bluetooth/hci_core.c:2989 hci_sched_acl_pkt net/bluetooth/hci_core.c:3498 [inline] hci_sched_acl net/bluetooth/hci_core.c:3583 [inline] hci_tx_work+0xb94/0x1a60 net/bluetooth/hci_core.c:3654 process_one_work+0x901/0xfb8 kernel/workqueue.c:2310 worker_thread+0xa67/0x1003 kernel/workqueue.c:2457 kthread+0x36a/0x430 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298
-> #0 ((work_completion)(&hdev->tx_work)){+.+.}-{0:0}: check_prev_add kernel/locking/lockdep.c:3053 [inline] check_prevs_add kernel/locking/lockdep.c:3172 [inline] validate_chain kernel/locking/lockdep.c:3787 [inline] __lock_acquire+0x2d32/0x77fa kernel/locking/lockdep.c:5011 lock_acquire+0x273/0x4d5 kernel/locking/lockdep.c:5622 __flush_work+0xee/0x19f kernel/workqueue.c:3090 hci_dev_close_sync+0x32f/0x1113 net/bluetooth/hci_sync.c:4352 hci_dev_do_close+0x47/0x9f net/bluetooth/hci_core.c:553 hci_rfkill_set_block+0x130/0x1ac net/bluetooth/hci_core.c:935 rfkill_set_block+0x1e6/0x3b8 net/rfkill/core.c:345 rfkill_fop_write+0x2d8/0x672 net/rfkill/core.c:1274 vfs_write+0x277/0xcf5 fs/read_write.c:594 ksys_write+0x19b/0x2bd fs/read_write.c:650 do_syscall_x64 arch/x86/entry/common.c:55 [inline] do_syscall_64+0x51/0xba arch/x86/entry/common.c:93 entry_SYSCALL_64_after_hwframe+0x61/0xcb
This change removes the need for acquiring the open_mutex in vhci_send_frame, thus eliminating the potential deadlock while maintaining the required packet ordering.
Fixes: 92d4abd66f70 ("Bluetooth: vhci: Fix race when opening vhci device") Signed-off-by: Ying Hsu yinghsu@chromium.org Signed-off-by: Luiz Augusto von Dentz luiz.von.dentz@intel.com [Daniil: In order to adapt this patch to branches 5.10 and 5.15 redundant fields of struct vhci_data were removed as these fields are not used in 5.10 and 5.15.] Signed-off-by: Daniil Dulov d.dulov@aladdin.ru --- drivers/bluetooth/hci_vhci.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-)
diff --git a/drivers/bluetooth/hci_vhci.c b/drivers/bluetooth/hci_vhci.c index 31d70bad83d2..93773ec90795 100644 --- a/drivers/bluetooth/hci_vhci.c +++ b/drivers/bluetooth/hci_vhci.c @@ -11,6 +11,7 @@ #include <linux/module.h> #include <asm/unaligned.h>
+#include <linux/atomic.h> #include <linux/kernel.h> #include <linux/init.h> #include <linux/slab.h> @@ -37,6 +38,7 @@ struct vhci_data {
struct mutex open_mutex; struct delayed_work open_timeout; + atomic_t initialized; };
static int vhci_open_dev(struct hci_dev *hdev) @@ -68,11 +70,10 @@ static int vhci_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1);
- mutex_lock(&data->open_mutex); skb_queue_tail(&data->readq, skb); - mutex_unlock(&data->open_mutex);
- wake_up_interruptible(&data->read_wait); + if (atomic_read(&data->initialized)) + wake_up_interruptible(&data->read_wait); return 0; }
@@ -139,7 +140,8 @@ static int __vhci_create_device(struct vhci_data *data, __u8 opcode) skb_put_u8(skb, 0xff); skb_put_u8(skb, opcode); put_unaligned_le16(hdev->id, skb_put(skb, 2)); - skb_queue_tail(&data->readq, skb); + skb_queue_head(&data->readq, skb); + atomic_inc(&data->initialized);
wake_up_interruptible(&data->read_wait); return 0;