================================================================== BUG: KASAN: slab-out-of-bounds in hci_inquiry_result_evt net/bluetooth/hci_event.c:2538 [inline] BUG: KASAN: slab-out-of-bounds in hci_event_packet+0x2240/0x18260 net/bluetooth/hci_event.c:6029 Read of size 3 at addr ffff8880a22d5dff by task kworker/u5:1/8089 CPU: 1 PID: 8089 Comm: kworker/u5:1 Not tainted 5.8.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: hci1 hci_rx_work Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1f0/0x31e lib/dump_stack.c:118 print_address_description+0x66/0x5a0 mm/kasan/report.c:383 __kasan_report mm/kasan/report.c:513 [inline] kasan_report+0x132/0x1d0 mm/kasan/report.c:530 check_memory_region_inline mm/kasan/generic.c:183 [inline] check_memory_region+0x2b5/0x2f0 mm/kasan/generic.c:192 memcpy+0x25/0x60 mm/kasan/common.c:105 hci_inquiry_result_evt net/bluetooth/hci_event.c:2538 [inline] hci_event_packet+0x2240/0x18260 net/bluetooth/hci_event.c:6029 hci_rx_work+0x236/0x9c0 net/bluetooth/hci_core.c:4705 process_one_work+0x789/0xfc0 kernel/workqueue.c:2269 worker_thread+0xaa4/0x1460 kernel/workqueue.c:2415 kthread+0x37e/0x3a0 drivers/block/aoe/aoecmd.c:1234 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293 Allocated by task 19679: save_stack mm/kasan/common.c:48 [inline] set_track mm/kasan/common.c:56 [inline] __kasan_kmalloc+0x103/0x140 mm/kasan/common.c:494 __kmalloc_reserve net/core/skbuff.c:142 [inline] __alloc_skb+0xde/0x4f0 net/core/skbuff.c:210 alloc_skb include/linux/skbuff.h:1083 [inline] bt_skb_alloc include/net/bluetooth/bluetooth.h:377 [inline] vhci_get_user drivers/bluetooth/hci_vhci.c:165 [inline] vhci_write+0xb7/0x400 drivers/bluetooth/hci_vhci.c:285 call_write_iter include/linux/fs.h:1908 [inline] new_sync_write fs/read_write.c:503 [inline] vfs_write+0xa08/0xc70 fs/read_write.c:578 ksys_write+0x11b/0x220 fs/read_write.c:631 do_syscall_64+0x73/0xe0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Freed by task 3901: save_stack mm/kasan/common.c:48 [inline] set_track mm/kasan/common.c:56 [inline] kasan_set_free_info mm/kasan/common.c:316 [inline] __kasan_slab_free+0x114/0x170 mm/kasan/common.c:455 __cache_free mm/slab.c:3426 [inline] kfree+0x10a/0x220 mm/slab.c:3757 kernfs_fop_release+0x211/0x2b0 fs/kernfs/file.c:782 __fput+0x2f0/0x750 fs/file_table.c:281 task_work_run+0x137/0x1c0 kernel/task_work.c:135 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop arch/x86/entry/common.c:239 [inline] __prepare_exit_to_usermode+0x14c/0x1e0 arch/x86/entry/common.c:269 do_syscall_64+0x7f/0xe0 arch/x86/entry/common.c:393 entry_SYSCALL_64_after_hwframe+0x44/0xa9 The buggy address belongs to the object at ffff8880a22d5c00 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 511 bytes inside of 512-byte region [ffff8880a22d5c00, ffff8880a22d5e00) The buggy address belongs to the page: page:ffffea000288b540 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 flags: 0xfffe0000000200(slab) raw: 00fffe0000000200 ffffea000280bdc8 ffffea0002a57008 ffff8880aa400a80 raw: 0000000000000000 ffff8880a22d5000 0000000100000004 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a22d5d00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880a22d5d80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8880a22d5e00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff8880a22d5e80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880a22d5f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================