================================================================== BUG: KASAN: slab-out-of-bounds in memcpy include/linux/string.h:373 [inline] BUG: KASAN: slab-out-of-bounds in bacpy include/net/bluetooth/bluetooth.h:236 [inline] BUG: KASAN: slab-out-of-bounds in hci_extended_inquiry_result_evt.isra.0+0x1aa/0x5b0 net/bluetooth/hci_event.c:4166 Read of size 6 at addr ffff888054c8ec46 by task kworker/u5:3/7922 CPU: 0 PID: 7922 Comm: kworker/u5:3 Not tainted 4.19.138-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: hci2 hci_rx_work Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2fe lib/dump_stack.c:118 print_address_description.cold+0x54/0x219 mm/kasan/report.c:256 kasan_report_error.cold+0x8a/0x1c7 mm/kasan/report.c:354 kasan_report+0x8f/0x96 mm/kasan/report.c:412 memcpy+0x20/0x50 mm/kasan/kasan.c:302 memcpy include/linux/string.h:373 [inline] bacpy include/net/bluetooth/bluetooth.h:236 [inline] hci_extended_inquiry_result_evt.isra.0+0x1aa/0x5b0 net/bluetooth/hci_event.c:4166 hci_event_packet+0x2025/0x858f net/bluetooth/hci_event.c:5857 hci_rx_work+0x46b/0xa90 net/bluetooth/hci_core.c:4359 process_one_work+0x864/0x1570 kernel/workqueue.c:2155 worker_thread+0x64c/0x1130 kernel/workqueue.c:2298 kthread+0x30b/0x410 kernel/kthread.c:246 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Allocated by task 13959: __do_kmalloc_node mm/slab.c:3689 [inline] __kmalloc_node_track_caller+0x4c/0x70 mm/slab.c:3703 __kmalloc_reserve net/core/skbuff.c:137 [inline] __alloc_skb+0xae/0x560 net/core/skbuff.c:205 alloc_skb include/linux/skbuff.h:995 [inline] bt_skb_alloc include/net/bluetooth/bluetooth.h:339 [inline] vhci_get_user drivers/bluetooth/hci_vhci.c:180 [inline] vhci_write+0xbd/0x450 drivers/bluetooth/hci_vhci.c:299 call_write_iter include/linux/fs.h:1821 [inline] new_sync_write fs/read_write.c:474 [inline] __vfs_write+0x51b/0x770 fs/read_write.c:487 vfs_write+0x1f3/0x540 fs/read_write.c:549 ksys_write+0x12b/0x2a0 fs/read_write.c:599 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 18: __cache_free mm/slab.c:3503 [inline] kfree+0xcc/0x210 mm/slab.c:3822 skb_free_head net/core/skbuff.c:554 [inline] skb_release_data+0x6de/0x920 net/core/skbuff.c:574 skb_release_all net/core/skbuff.c:631 [inline] __kfree_skb net/core/skbuff.c:645 [inline] kfree_skb+0x11a/0x3d0 net/core/skbuff.c:663 skb_queue_purge+0x14/0x30 net/core/skbuff.c:2858 netlink_sock_destruct+0x101/0x280 net/netlink/af_netlink.c:403 __sk_destruct+0x4b/0x810 net/core/sock.c:1559 sk_destruct net/core/sock.c:1599 [inline] __sk_free+0x165/0x3b0 net/core/sock.c:1610 sk_free+0x3b/0x50 net/core/sock.c:1621 deferred_put_nlk_sk+0x10d/0x280 net/netlink/af_netlink.c:743 __rcu_reclaim kernel/rcu/rcu.h:236 [inline] rcu_do_batch kernel/rcu/tree.c:2584 [inline] invoke_rcu_callbacks kernel/rcu/tree.c:2897 [inline] __rcu_process_callbacks kernel/rcu/tree.c:2864 [inline] rcu_process_callbacks+0x8ff/0x18b0 kernel/rcu/tree.c:2881 __do_softirq+0x26c/0x9a0 kernel/softirq.c:292 The buggy address belongs to the object at ffff888054c8ea40 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 6 bytes to the right of 512-byte region [ffff888054c8ea40, ffff888054c8ec40) The buggy address belongs to the page: page:ffffea0001532380 count:1 mapcount:0 mapping:ffff88812c39c940 index:0x0 flags: 0xfffe0000000100(slab) raw: 00fffe0000000100 ffffea0001490488 ffffea00022f4088 ffff88812c39c940 raw: 0000000000000000 ffff888054c8e040 0000000100000006 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888054c8eb00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888054c8eb80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888054c8ec00: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ^ ffff888054c8ec80: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ffff888054c8ed00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================