================================================================== BUG: KASAN: slab-out-of-bounds in hci_le_direct_adv_report_evt net/bluetooth/hci_event.c:5864 [inline] BUG: KASAN: slab-out-of-bounds in hci_le_meta_evt+0x3922/0x3fd0 net/bluetooth/hci_event.c:5927 Read of size 1 at addr ffff8880908aa20c by task kworker/u5:2/8116 CPU: 1 PID: 8116 Comm: kworker/u5:2 Not tainted 5.8.0-rc7-next-20200731-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: hci4 hci_rx_work Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x18f/0x20d lib/dump_stack.c:118 print_address_description.constprop.0.cold+0xae/0x497 mm/kasan/report.c:383 __kasan_report mm/kasan/report.c:513 [inline] kasan_report.cold+0x1f/0x37 mm/kasan/report.c:530 hci_le_direct_adv_report_evt net/bluetooth/hci_event.c:5864 [inline] hci_le_meta_evt+0x3922/0x3fd0 net/bluetooth/hci_event.c:5927 hci_event_packet+0x2e25/0x87a8 net/bluetooth/hci_event.c:6180 hci_rx_work+0x22e/0xb50 net/bluetooth/hci_core.c:4889 process_one_work+0x94c/0x1670 kernel/workqueue.c:2269 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415 kthread+0x3b5/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Allocated by task 28676: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48 kasan_set_track mm/kasan/common.c:56 [inline] __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:461 __kmalloc_reserve net/core/skbuff.c:142 [inline] __alloc_skb+0xae/0x550 net/core/skbuff.c:210 alloc_skb include/linux/skbuff.h:1084 [inline] bt_skb_alloc include/net/bluetooth/bluetooth.h:389 [inline] vhci_get_user drivers/bluetooth/hci_vhci.c:165 [inline] vhci_write+0xbd/0x450 drivers/bluetooth/hci_vhci.c:285 call_write_iter include/linux/fs.h:1876 [inline] new_sync_write+0x422/0x650 fs/read_write.c:515 vfs_write+0x5ad/0x730 fs/read_write.c:595 ksys_write+0x12d/0x250 fs/read_write.c:648 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Last call_rcu(): kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48 kasan_record_aux_stack+0x82/0xb0 mm/kasan/generic.c:346 __call_rcu kernel/rcu/tree.c:2883 [inline] call_rcu+0x14f/0x7e0 kernel/rcu/tree.c:2957 put_ctx kernel/events/core.c:1271 [inline] put_ctx+0x116/0x1e0 kernel/events/core.c:1264 _free_event+0x3c5/0x1270 kernel/events/core.c:4826 put_event kernel/events/core.c:4906 [inline] perf_event_release_kernel+0xa24/0xe00 kernel/events/core.c:5021 perf_release+0x33/0x40 kernel/events/core.c:5031 __fput+0x285/0x920 fs/file_table.c:281 task_work_run+0xdd/0x190 kernel/task_work.c:135 exit_task_work include/linux/task_work.h:25 [inline] do_exit+0xb7d/0x29f0 kernel/exit.c:806 do_group_exit+0x125/0x310 kernel/exit.c:903 get_signal+0x40b/0x1ee0 kernel/signal.c:2743 arch_do_signal+0x82/0x2520 arch/x86/kernel/signal.c:811 exit_to_user_mode_loop kernel/entry/common.c:135 [inline] exit_to_user_mode_prepare+0x15d/0x1c0 kernel/entry/common.c:166 irqentry_exit_to_user_mode+0x5/0x30 kernel/entry/common.c:254 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:581 The buggy address belongs to the object at ffff8880908aa000 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 12 bytes to the right of 512-byte region [ffff8880908aa000, ffff8880908aa200) The buggy address belongs to the page: page:00000000392980ca refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x908aa flags: 0xfffe0000000200(slab) raw: 00fffe0000000200 ffffea0002468548 ffffea00025cec08 ffff8880aa000600 raw: 0000000000000000 ffff8880908aa000 0000000100000004 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880908aa100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880908aa180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8880908aa200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff8880908aa280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880908aa300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================