Hello, syzbot found the following crash on: HEAD commit: a581387e Merge tag 'io_uring-5.8-2020-07-10' of git://git... git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=173dd65d100000 kernel config: https://syzkaller.appspot.com/x/.config?x=66ad203c2bb6d8b dashboard link: https://syzkaller.appspot.com/bug?extid=3a430af182785b4c7360 compiler: gcc (GCC) 10.1.0-syz 20200507 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12badf8f100000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1000d6db100000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+3a430af182785b4c7360@xxxxxxxxxxxxxxxxxxxxxxxxx ================================================================== BUG: KASAN: slab-out-of-bounds in memcpy include/linux/string.h:406 [inline] BUG: KASAN: slab-out-of-bounds in bacpy include/net/bluetooth/bluetooth.h:274 [inline] BUG: KASAN: slab-out-of-bounds in hci_inquiry_result_with_rssi_evt+0x230/0x6b0 net/bluetooth/hci_event.c:4169 Read of size 6 at addr ffff88809dbc85fb by task kworker/u5:0/1521 CPU: 1 PID: 1521 Comm: kworker/u5:0 Not tainted 5.8.0-rc4-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+0x18f/0x20d lib/dump_stack.c:118 print_address_description.constprop.0.cold+0xae/0x436 mm/kasan/report.c:383 __kasan_report mm/kasan/report.c:513 [inline] kasan_report.cold+0x1f/0x37 mm/kasan/report.c:530 check_memory_region_inline mm/kasan/generic.c:186 [inline] check_memory_region+0x13d/0x180 mm/kasan/generic.c:192 memcpy+0x20/0x60 mm/kasan/common.c:105 memcpy include/linux/string.h:406 [inline] bacpy include/net/bluetooth/bluetooth.h:274 [inline] hci_inquiry_result_with_rssi_evt+0x230/0x6b0 net/bluetooth/hci_event.c:4169 hci_event_packet+0x1e8c/0x86f5 net/bluetooth/hci_event.c:6103 hci_rx_work+0x22e/0xb10 net/bluetooth/hci_core.c:4705 process_one_work+0x94c/0x1670 kernel/workqueue.c:2269 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415 kthread+0x3b5/0x4a0 kernel/kthread.c:291 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293 Allocated by task 6905: save_stack+0x1b/0x40 mm/kasan/common.c:48 set_track mm/kasan/common.c:56 [inline] __kasan_kmalloc.constprop.0+0xc2/0xd0 mm/kasan/common.c:494 __kmalloc_reserve net/core/skbuff.c:142 [inline] __alloc_skb+0xae/0x550 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+0xbd/0x450 drivers/bluetooth/hci_vhci.c:285 call_write_iter include/linux/fs.h:1908 [inline] new_sync_write+0x422/0x650 fs/read_write.c:503 vfs_write+0x59d/0x6b0 fs/read_write.c:578 ksys_write+0x12d/0x250 fs/read_write.c:631 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Freed by task 4921: save_stack+0x1b/0x40 mm/kasan/common.c:48 set_track mm/kasan/common.c:56 [inline] kasan_set_free_info mm/kasan/common.c:316 [inline] __kasan_slab_free+0xf5/0x140 mm/kasan/common.c:455 __cache_free mm/slab.c:3426 [inline] kfree+0x103/0x2c0 mm/slab.c:3757 ep_eventpoll_release+0x41/0x60 fs/eventpoll.c:864 __fput+0x33c/0x880 fs/file_table.c:281 task_work_run+0xdd/0x190 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+0x1e9/0x1f0 arch/x86/entry/common.c:269 do_syscall_64+0x6c/0xe0 arch/x86/entry/common.c:393 entry_SYSCALL_64_after_hwframe+0x44/0xa9 The buggy address belongs to the object at ffff88809dbc8400 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 507 bytes inside of 512-byte region [ffff88809dbc8400, ffff88809dbc8600) The buggy address belongs to the page: page:ffffea000276f200 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 flags: 0xfffe0000000200(slab) raw: 00fffe0000000200 ffffea000288bb48 ffffea0002877488 ffff8880aa000a80 raw: 0000000000000000 ffff88809dbc8000 0000000100000004 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88809dbc8500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88809dbc8580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88809dbc8600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88809dbc8680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88809dbc8700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ================================================================== --- This bug is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this bug report. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. syzbot can test patches for this bug, for details see: https://goo.gl/tpsmEJ#testing-patches
