================================================================== BUG: KASAN: slab-out-of-bounds in hci_inquiry_result_evt net/bluetooth/hci_event.c:2538 [inline] BUG: KASAN: slab-out-of-bounds in hci_event_packet+0x2240/0x18260 net/bluetooth/hci_event.c:6029 Read of size 3 at addr ffff88808b2969ff by task kworker/u5:2/8090 CPU: 0 PID: 8090 Comm: kworker/u5:2 Not tainted 5.8.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: hci5 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 hci_inquiry_result_evt net/bluetooth/hci_event.c:2538 [inline] hci_event_packet+0x2240/0x18260 net/bluetooth/hci_event.c:6029 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 13526: 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:1908 [inline] new_sync_write fs/read_write.c:503 [inline] vfs_write+0xa08/0xc70 fs/read_write.c:578 ksys_write+0x11b/0x220 fs/read_write.c:631 do_syscall_64+0x73/0xe0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Freed by task 12: 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 netlink_broadcast_filtered+0x1035/0x1150 net/netlink/af_netlink.c:1513 netlink_broadcast net/netlink/af_netlink.c:1535 [inline] nlmsg_multicast include/net/netlink.h:1020 [inline] nlmsg_notify+0x104/0x1e0 net/netlink/af_netlink.c:2512 neigh_cleanup_and_release+0x27/0xb0 net/core/neighbour.c:102 neigh_periodic_work+0x39a/0xac0 net/core/neighbour.c:939 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 The buggy address belongs to the object at ffff88808b296800 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 511 bytes inside of 512-byte region [ffff88808b296800, ffff88808b296a00) The buggy address belongs to the page: page:ffffea00022ca580 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88808b296c00 flags: 0xfffe0000000200(slab) raw: 00fffe0000000200 ffffea00028ec388 ffffea000251b348 ffff8880aa400a80 raw: ffff88808b296c00 ffff88808b296000 0000000100000003 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88808b296900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88808b296980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88808b296a00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88808b296a80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88808b296b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================