================================================================== BUG: KASAN: slab-out-of-bounds in hci_extended_inquiry_result_evt net/bluetooth/hci_event.c:4281 [inline] BUG: KASAN: slab-out-of-bounds in hci_event_packet+0x5084/0xa931 net/bluetooth/hci_event.c:5984 Read of size 6 at addr ffff88809f254208 by task kworker/u5:0/1618 CPU: 0 PID: 1618 Comm: kworker/u5:0 Not tainted 5.6.0-rc6-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+0x188/0x20d lib/dump_stack.c:118 print_address_description.constprop.0.cold+0xd3/0x315 mm/kasan/report.c:374 __kasan_report.cold+0x1a/0x32 mm/kasan/report.c:506 kasan_report+0xe/0x20 mm/kasan/common.c:641 check_memory_region_inline mm/kasan/generic.c:185 [inline] check_memory_region+0x128/0x190 mm/kasan/generic.c:192 memcpy+0x20/0x50 mm/kasan/common.c:127 hci_extended_inquiry_result_evt net/bluetooth/hci_event.c:4281 [inline] hci_event_packet+0x5084/0xa931 net/bluetooth/hci_event.c:5984 hci_rx_work+0x239/0xb20 net/bluetooth/hci_core.c:4557 process_one_work+0x94b/0x1690 kernel/workqueue.c:2266 worker_thread+0x96/0xe20 kernel/workqueue.c:2412 kthread+0x357/0x430 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Allocated by task 9455: save_stack+0x1b/0x80 mm/kasan/common.c:72 set_track mm/kasan/common.c:80 [inline] __kasan_kmalloc mm/kasan/common.c:515 [inline] __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:488 __kmalloc_reserve.isra.0+0x39/0xe0 net/core/skbuff.c:142 __alloc_skb+0xef/0x5a0 net/core/skbuff.c:210 alloc_skb include/linux/skbuff.h:1081 [inline] bt_skb_alloc include/net/bluetooth/bluetooth.h:341 [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:1902 [inline] new_sync_write+0x49c/0x700 fs/read_write.c:483 __vfs_write+0xc9/0x100 fs/read_write.c:496 vfs_write+0x262/0x5c0 fs/read_write.c:558 ksys_write+0x127/0x250 fs/read_write.c:611 do_syscall_32_irqs_on arch/x86/entry/common.c:337 [inline] do_fast_syscall_32+0x270/0xe8f arch/x86/entry/common.c:408 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139 Freed by task 8497: save_stack+0x1b/0x80 mm/kasan/common.c:72 set_track mm/kasan/common.c:80 [inline] kasan_set_free_info mm/kasan/common.c:337 [inline] __kasan_slab_free+0xf7/0x140 mm/kasan/common.c:476 __cache_free mm/slab.c:3426 [inline] kfree+0x109/0x2b0 mm/slab.c:3757 load_elf_binary+0x240d/0x4870 fs/binfmt_elf.c:1086 search_binary_handler fs/exec.c:1662 [inline] search_binary_handler+0x16b/0x580 fs/exec.c:1639 exec_binprm fs/exec.c:1705 [inline] __do_execve_file.isra.0+0x12fc/0x2270 fs/exec.c:1825 do_execveat_common fs/exec.c:1871 [inline] do_execve fs/exec.c:1888 [inline] __do_sys_execve fs/exec.c:1964 [inline] __se_sys_execve fs/exec.c:1959 [inline] __x64_sys_execve+0x8a/0xb0 fs/exec.c:1959 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff88809f254000 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 8 bytes to the right of 512-byte region [ffff88809f254000, ffff88809f254200) The buggy address belongs to the page: page:ffffea00027c9500 refcount:1 mapcount:0 mapping:ffff8880aa000a80 index:0x0 flags: 0xfffe0000000200(slab) raw: 00fffe0000000200 ffffea00027cd908 ffffea00027ebf48 ffff8880aa000a80 raw: 0000000000000000 ffff88809f254000 0000000100000004 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88809f254100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88809f254180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88809f254200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88809f254280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88809f254300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================