================================================================== 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_extended_inquiry_result_evt.isra.0+0x1be/0x5e0 net/bluetooth/hci_event.c:4394 Read of size 6 at addr ffff8880a6dd2404 by task kworker/u5:0/1520 CPU: 0 PID: 1520 Comm: kworker/u5:0 Not tainted 5.8.0-rc3-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_extended_inquiry_result_evt.isra.0+0x1be/0x5e0 net/bluetooth/hci_event.c:4394 hci_event_packet+0x2828/0x86f5 net/bluetooth/hci_event.c:6115 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 6974: 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:1907 [inline] new_sync_write+0x422/0x650 fs/read_write.c:484 __vfs_write+0xc9/0x100 fs/read_write.c:497 vfs_write+0x268/0x5d0 fs/read_write.c:559 ksys_write+0x12d/0x250 fs/read_write.c:612 do_syscall_32_irqs_on+0x3f/0x60 arch/x86/entry/common.c:403 __do_fast_syscall_32 arch/x86/entry/common.c:448 [inline] do_fast_syscall_32+0x7f/0x120 arch/x86/entry/common.c:474 entry_SYSENTER_compat+0x6d/0x7c arch/x86/entry/entry_64_compat.S:138 Freed by task 0: (stack is not available) The buggy address belongs to the object at ffff8880a6dd2000 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 4 bytes to the right of 1024-byte region [ffff8880a6dd2000, ffff8880a6dd2400) The buggy address belongs to the page: page:ffffea00029b7480 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 flags: 0xfffe0000000200(slab) raw: 00fffe0000000200 ffffea00027f1d48 ffffea00029894c8 ffff8880aa000c40 raw: 0000000000000000 ffff8880a6dd2000 0000000100000002 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a6dd2300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880a6dd2380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8880a6dd2400: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff8880a6dd2480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880a6dd2500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================