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BUG: KMSAN: uninit-value in hci_conn_complete_evt net/bluetooth/hci_event.c:2485 [inline]
BUG: KMSAN: uninit-value in hci_event_packet+0x12a3c/0x356e0 net/bluetooth/hci_event.c:5865
CPU: 0 PID: 2306 Comm: kworker/u5:0 Not tainted 5.5.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: hci0 hci_rx_work
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1c9/0x220 lib/dump_stack.c:118
 kmsan_report+0xf8/0x1e0 mm/kmsan/kmsan_report.c:118
 __msan_warning+0x58/0xa0 mm/kmsan/kmsan_instr.c:215
 hci_conn_complete_evt net/bluetooth/hci_event.c:2485 [inline]
 hci_event_packet+0x12a3c/0x356e0 net/bluetooth/hci_event.c:5865
 hci_rx_work+0x438/0xd40 net/bluetooth/hci_core.c:4491
 process_one_work+0x1572/0x1ef0 kernel/workqueue.c:2264
 worker_thread+0x111b/0x2460 kernel/workqueue.c:2410
 kthread+0x4b5/0x4f0 kernel/kthread.c:256
 ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:353

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:144 [inline]
 kmsan_internal_poison_shadow+0x5c/0xf0 mm/kmsan/kmsan.c:127
 kmsan_slab_alloc+0x8b/0xe0 mm/kmsan/kmsan_hooks.c:82
 slab_alloc_node mm/slub.c:2774 [inline]
 __kmalloc_node_track_caller+0xe47/0x11f0 mm/slub.c:4382
 __kmalloc_reserve net/core/skbuff.c:141 [inline]
 __alloc_skb+0x309/0xa50 net/core/skbuff.c:209
 alloc_skb include/linux/skbuff.h:1049 [inline]
 bt_skb_alloc include/net/bluetooth/bluetooth.h:339 [inline]
 bcsp_recv+0x2ec/0x1f00 drivers/bluetooth/hci_bcsp.c:673
 hci_uart_tty_receive+0x35c/0x5d0 drivers/bluetooth/hci_ldisc.c:613
 tty_ldisc_receive_buf+0x2ea/0x350 drivers/tty/tty_buffer.c:465
 tty_port_default_receive_buf+0x14f/0x1e0 drivers/tty/tty_port.c:38
 receive_buf drivers/tty/tty_buffer.c:481 [inline]
 flush_to_ldisc+0x477/0x870 drivers/tty/tty_buffer.c:533
 process_one_work+0x1572/0x1ef0 kernel/workqueue.c:2264
 worker_thread+0x111b/0x2460 kernel/workqueue.c:2410
 kthread+0x4b5/0x4f0 kernel/kthread.c:256
 ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:353
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