================================================================== 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 net/bluetooth/hci_event.c:4394 [inline] BUG: KASAN: slab-out-of-bounds in hci_event_packet+0x6c7/0x18240 net/bluetooth/hci_event.c:6115 Read of size 6 at addr ffff88809a1da404 by task kworker/u5:0/1522 CPU: 0 PID: 1522 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+0x1f0/0x31e lib/dump_stack.c:118 print_address_description+0x66/0x5a0 mm/kasan/report.c:383 __kasan_report mm/kasan/report.c:513 [inline] kasan_report+0x132/0x1d0 mm/kasan/report.c:530 check_memory_region_inline mm/kasan/generic.c:183 [inline] check_memory_region+0x2b5/0x2f0 mm/kasan/generic.c:192 memcpy+0x25/0x60 mm/kasan/common.c:105 bacpy include/net/bluetooth/bluetooth.h:274 [inline] hci_extended_inquiry_result_evt net/bluetooth/hci_event.c:4394 [inline] hci_event_packet+0x6c7/0x18240 net/bluetooth/hci_event.c:6115 hci_rx_work+0x236/0x9c0 net/bluetooth/hci_core.c:4705 process_one_work+0x789/0xfc0 kernel/workqueue.c:2269 worker_thread+0xaa4/0x1460 kernel/workqueue.c:2415 kthread+0x37e/0x3a0 drivers/block/aoe/aoecmd.c:1234 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293 Allocated by task 6806: save_stack mm/kasan/common.c:48 [inline] set_track mm/kasan/common.c:56 [inline] __kasan_kmalloc+0x103/0x140 mm/kasan/common.c:494 __kmalloc_reserve net/core/skbuff.c:142 [inline] __alloc_skb+0xde/0x4f0 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+0xb7/0x400 drivers/bluetooth/hci_vhci.c:285 call_write_iter include/linux/fs.h:1907 [inline] new_sync_write fs/read_write.c:484 [inline] __vfs_write+0x52f/0x6e0 fs/read_write.c:497 vfs_write+0x274/0x580 fs/read_write.c:559 ksys_write+0x11b/0x220 fs/read_write.c:612 do_syscall_64+0x73/0xe0 arch/x86/entry/common.c:359 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Freed by task 1: save_stack mm/kasan/common.c:48 [inline] set_track mm/kasan/common.c:56 [inline] kasan_set_free_info mm/kasan/common.c:316 [inline] __kasan_slab_free+0x114/0x170 mm/kasan/common.c:455 __cache_free mm/slab.c:3426 [inline] kfree+0x10a/0x220 mm/slab.c:3757 skb_release_all net/core/skbuff.c:664 [inline] __kfree_skb+0x56/0x1c0 net/core/skbuff.c:678 skb_free_datagram+0x24/0xd0 net/core/datagram.c:325 netlink_recvmsg+0x553/0xfe0 net/netlink/af_netlink.c:1997 ____sys_recvmsg+0x24a/0x510 include/linux/uio.h:235 ___sys_recvmsg net/socket.c:2617 [inline] __sys_recvmsg+0x23b/0x7e0 net/socket.c:2651 do_syscall_64+0x73/0xe0 arch/x86/entry/common.c:359 entry_SYSCALL_64_after_hwframe+0x44/0xa9 The buggy address belongs to the object at ffff88809a1da000 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 4 bytes to the right of 1024-byte region [ffff88809a1da000, ffff88809a1da400) The buggy address belongs to the page: page:ffffea0002687680 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 flags: 0xfffe0000000200(slab) raw: 00fffe0000000200 ffffea00029c2a08 ffffea00027ac808 ffff8880aa400c40 raw: 0000000000000000 ffff88809a1da000 0000000100000002 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88809a1da300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88809a1da380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88809a1da400: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88809a1da480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88809a1da500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================