================================================================== BUG: KASAN: slab-out-of-bounds in hci_le_direct_adv_report_evt net/bluetooth/hci_event.c:5850 [inline] BUG: KASAN: slab-out-of-bounds in hci_le_meta_evt+0x380c/0x3eb0 net/bluetooth/hci_event.c:5914 Read of size 1 at addr ffff88808de36e0c by task kworker/u5:3/8149 CPU: 0 PID: 8149 Comm: kworker/u5:3 Not tainted 5.8.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: hci4 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 hci_le_direct_adv_report_evt net/bluetooth/hci_event.c:5850 [inline] hci_le_meta_evt+0x380c/0x3eb0 net/bluetooth/hci_event.c:5914 hci_event_packet+0x245a/0x86f5 net/bluetooth/hci_event.c:6167 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 8618: 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:1908 [inline] new_sync_write+0x422/0x650 fs/read_write.c:503 vfs_write+0x59d/0x6b0 fs/read_write.c:578 ksys_write+0x12d/0x250 fs/read_write.c:631 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Freed by task 7302: save_stack+0x1b/0x40 mm/kasan/common.c:48 set_track mm/kasan/common.c:56 [inline] kasan_set_free_info mm/kasan/common.c:316 [inline] __kasan_slab_free+0xf5/0x140 mm/kasan/common.c:455 __cache_free mm/slab.c:3426 [inline] kfree+0x103/0x2c0 mm/slab.c:3757 skb_free_head net/core/skbuff.c:590 [inline] skb_release_data+0x6d9/0x910 net/core/skbuff.c:610 skb_release_all net/core/skbuff.c:664 [inline] __kfree_skb net/core/skbuff.c:678 [inline] consume_skb net/core/skbuff.c:837 [inline] consume_skb+0xc2/0x160 net/core/skbuff.c:831 netlink_broadcast_filtered+0x35c/0xdc0 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+0x90/0x250 net/netlink/af_netlink.c:2512 __neigh_notify+0xdc/0x160 net/core/neighbour.c:3367 neigh_cleanup_and_release+0x94/0x3a0 net/core/neighbour.c:102 neigh_del net/core/neighbour.c:194 [inline] neigh_remove_one+0x3b1/0x440 net/core/neighbour.c:215 neigh_forced_gc net/core/neighbour.c:242 [inline] neigh_alloc net/core/neighbour.c:389 [inline] ___neigh_create+0x165e/0x2500 net/core/neighbour.c:577 ip6_finish_output2+0xe3c/0x17b0 net/ipv6/ip6_output.c:114 __ip6_finish_output net/ipv6/ip6_output.c:143 [inline] __ip6_finish_output+0x447/0xab0 net/ipv6/ip6_output.c:128 ip6_finish_output+0x34/0x1f0 net/ipv6/ip6_output.c:153 NF_HOOK_COND include/linux/netfilter.h:296 [inline] ip6_output+0x1db/0x520 net/ipv6/ip6_output.c:176 dst_output include/net/dst.h:443 [inline] NF_HOOK include/linux/netfilter.h:307 [inline] ndisc_send_skb+0xa69/0x1720 net/ipv6/ndisc.c:506 ndisc_send_rs+0x12e/0x700 net/ipv6/ndisc.c:700 addrconf_rs_timer+0x2ec/0x7c0 net/ipv6/addrconf.c:3848 call_timer_fn+0x1ac/0x760 kernel/time/timer.c:1416 expire_timers kernel/time/timer.c:1461 [inline] __run_timers.part.0+0x54c/0xa20 kernel/time/timer.c:1792 __run_timers kernel/time/timer.c:1764 [inline] run_timer_softirq+0xae/0x1a0 kernel/time/timer.c:1805 __do_softirq+0x34c/0xa60 kernel/softirq.c:292 The buggy address belongs to the object at ffff88808de36c00 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 12 bytes to the right of 512-byte region [ffff88808de36c00, ffff88808de36e00) The buggy address belongs to the page: page:ffffea0002378d80 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 flags: 0xfffe0000000200(slab) raw: 00fffe0000000200 ffffea000298ea88 ffffea00024ea988 ffff8880aa000a80 raw: 0000000000000000 ffff88808de36000 0000000100000004 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88808de36d00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88808de36d80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88808de36e00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88808de36e80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88808de36f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================