Bluetooth: hci4: Frame reassembly failed (-84) Bluetooth: hci5: Entering manufacturer mode failed (-110) Bluetooth: hci5 command 0xfc11 tx timeout Bluetooth: hci0: Entering manufacturer mode failed (-110) ================================================================== BUG: KASAN: use-after-free in hci_cmd_timeout+0x1a2/0x1c0 net/bluetooth/hci_core.c:2525 Read of size 2 at addr ffff88809c7ce348 by task kworker/0:4/7091 CPU: 0 PID: 7091 Comm: kworker/0:4 Not tainted 4.14.178-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events hci_cmd_timeout Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0xf7/0x13b lib/dump_stack.c:58 print_address_description.cold.7+0x9/0x1c9 mm/kasan/report.c:252 kasan_report_error mm/kasan/report.c:351 [inline] kasan_report.cold.8+0x11a/0x2d3 mm/kasan/report.c:409 __asan_report_load_n_noabort+0xf/0x20 mm/kasan/report.c:440 hci_cmd_timeout+0x1a2/0x1c0 net/bluetooth/hci_core.c:2525 process_one_work+0x79e/0x16c0 kernel/workqueue.c:2116 worker_thread+0xcc/0xee0 kernel/workqueue.c:2250 kthread+0x338/0x400 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 Allocated by task 1177: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59 save_stack+0x43/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:551 __do_kmalloc_node mm/slab.c:3682 [inline] __kmalloc_node_track_caller+0x50/0x70 mm/slab.c:3696 __kmalloc_reserve.isra.38+0x2c/0xc0 net/core/skbuff.c:137 __alloc_skb+0xc1/0x500 net/core/skbuff.c:205 alloc_skb include/linux/skbuff.h:980 [inline] bt_skb_alloc include/net/bluetooth/bluetooth.h:336 [inline] hci_prepare_cmd+0x2c/0x200 net/bluetooth/hci_request.c:298 hci_req_add_ev+0x7f/0x1f0 net/bluetooth/hci_request.c:332 __hci_cmd_sync_ev+0x15d/0x5f0 net/bluetooth/hci_request.c:129 __hci_cmd_sync+0x12/0x20 net/bluetooth/hci_request.c:185 btintel_enter_mfg+0x71/0xd0 drivers/bluetooth/btintel.c:81 ag6xx_setup+0x103/0x790 drivers/bluetooth/hci_ag6xx.c:180 hci_uart_setup+0x19c/0x3a0 drivers/bluetooth/hci_ldisc.c:429 hci_dev_do_open+0x8c4/0xe70 net/bluetooth/hci_core.c:1384 hci_power_on+0x7d/0x360 net/bluetooth/hci_core.c:2080 process_one_work+0x79e/0x16c0 kernel/workqueue.c:2116 worker_thread+0xcc/0xee0 kernel/workqueue.c:2250 kthread+0x338/0x400 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 Freed by task 1177: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59 save_stack+0x43/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_slab_free+0x71/0xc0 mm/kasan/kasan.c:524 __cache_free mm/slab.c:3496 [inline] kfree+0xcc/0x270 mm/slab.c:3815 skb_free_head+0x74/0x90 net/core/skbuff.c:554 skb_release_data+0x4d3/0x860 net/core/skbuff.c:574 skb_release_all+0x3d/0x50 net/core/skbuff.c:631 __kfree_skb net/core/skbuff.c:645 [inline] kfree_skb+0x8a/0x2b0 net/core/skbuff.c:663 hci_dev_do_open+0x7e8/0xe70 net/bluetooth/hci_core.c:1469 hci_power_on+0x7d/0x360 net/bluetooth/hci_core.c:2080 process_one_work+0x79e/0x16c0 kernel/workqueue.c:2116 worker_thread+0xcc/0xee0 kernel/workqueue.c:2250 kthread+0x338/0x400 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 The buggy address belongs to the object at ffff88809c7ce340 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 8 bytes inside of 512-byte region [ffff88809c7ce340, ffff88809c7ce540) The buggy address belongs to the page: page:ffffea000271f380 count:1 mapcount:0 mapping:ffff88809c7ce0c0 index:0x0 flags: 0xfffe0000000100(slab) raw: 00fffe0000000100 ffff88809c7ce0c0 0000000000000000 0000000100000006 raw: ffffea000251e420 ffffea00026edd20 ffff8880aa800940 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88809c7ce200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88809c7ce280: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff88809c7ce300: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ^ ffff88809c7ce380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88809c7ce400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================