================================================================== BUG: KASAN: slab-out-of-bounds in memcpy include/linux/string.h:372 [inline] BUG: KASAN: slab-out-of-bounds in hci_inquiry_result_evt net/bluetooth/hci_event.c:2112 [inline] BUG: KASAN: slab-out-of-bounds in hci_event_packet+0x35fc/0x7c7a net/bluetooth/hci_event.c:5278 Read of size 3 at addr ffff88808d36e9ff by task kworker/u5:0/1201 CPU: 0 PID: 1201 Comm: kworker/u5:0 Not tainted 4.14.191-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:17 [inline] dump_stack+0x1b2/0x283 lib/dump_stack.c:58 print_address_description.cold+0x54/0x1d3 mm/kasan/report.c:252 kasan_report_error.cold+0x8a/0x194 mm/kasan/report.c:351 ptrace attach of "/root/syz-executor.5"[6950] was attempted by "/root/syz-executor.5"[6952] kasan_report+0x6f/0x7b mm/kasan/report.c:409 memcpy+0x20/0x50 mm/kasan/kasan.c:302 memcpy include/linux/string.h:372 [inline] hci_inquiry_result_evt net/bluetooth/hci_event.c:2112 [inline] hci_event_packet+0x35fc/0x7c7a net/bluetooth/hci_event.c:5278 hci_rx_work+0x3e6/0x970 net/bluetooth/hci_core.c:4244 process_one_work+0x793/0x14a0 kernel/workqueue.c:2116 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2250 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 Allocated by task 6945: save_stack mm/kasan/kasan.c:447 [inline] set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:551 __do_kmalloc_node mm/slab.c:3682 [inline] __kmalloc_node_track_caller+0x4c/0x70 mm/slab.c:3696 __kmalloc_reserve net/core/skbuff.c:137 [inline] __alloc_skb+0x96/0x510 net/core/skbuff.c:205 alloc_skb include/linux/skbuff.h:980 [inline] bt_skb_alloc include/net/bluetooth/bluetooth.h:336 [inline] vhci_get_user drivers/bluetooth/hci_vhci.c:180 [inline] vhci_write+0xb1/0x420 drivers/bluetooth/hci_vhci.c:299 call_write_iter include/linux/fs.h:1778 [inline] new_sync_write fs/read_write.c:469 [inline] __vfs_write+0x44c/0x630 fs/read_write.c:482 vfs_write+0x17f/0x4d0 fs/read_write.c:544 SYSC_write fs/read_write.c:590 [inline] SyS_write+0xf2/0x210 fs/read_write.c:582 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb Freed by task 3654: save_stack mm/kasan/kasan.c:447 [inline] set_track mm/kasan/kasan.c:459 [inline] kasan_slab_free+0xc3/0x1a0 mm/kasan/kasan.c:524 __cache_free mm/slab.c:3496 [inline] kfree+0xc9/0x250 mm/slab.c:3815 kernfs_fop_release+0x10e/0x180 fs/kernfs/file.c:783 __fput+0x25f/0x7a0 fs/file_table.c:210 task_work_run+0x11f/0x190 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:191 [inline] exit_to_usermode_loop+0x1ad/0x200 arch/x86/entry/common.c:164 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x46/0xbb The buggy address belongs to the object at ffff88808d36e800 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 511 bytes inside of 512-byte region [ffff88808d36e800, ffff88808d36ea00) The buggy address belongs to the page: page:ffffea000234db80 count:1 mapcount:0 mapping:ffff88808d36e080 index:0x0 flags: 0xfffe0000000100(slab) raw: 00fffe0000000100 ffff88808d36e080 0000000000000000 0000000100000006 raw: ffffea000253e660 ffffea0002a3efa0 ffff88812fe52940 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88808d36e900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88808d36e980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88808d36ea00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88808d36ea80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88808d36eb00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================