netlink: 24 bytes leftover after parsing attributes in process `syz-executor.3'. ================================================================== BUG: KASAN: slab-out-of-bounds in memcpy include/linux/string.h:373 [inline] BUG: KASAN: slab-out-of-bounds in hci_inquiry_result_evt net/bluetooth/hci_event.c:2378 [inline] BUG: KASAN: slab-out-of-bounds in hci_event_packet+0x3dbf/0x858f net/bluetooth/hci_event.c:5759 Read of size 3 at addr ffff888098c8b2bf by task kworker/u5:3/7907 CPU: 1 PID: 7907 Comm: kworker/u5:3 Not tainted 4.19.137-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: hci1 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] hci_inquiry_result_evt net/bluetooth/hci_event.c:2378 [inline] hci_event_packet+0x3dbf/0x858f net/bluetooth/hci_event.c:5759 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 2280: __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 835: __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] consume_skb+0x113/0x3d0 net/core/skbuff.c:705 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x4dd/0x690 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x6bb/0xc40 net/netlink/af_netlink.c:1909 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xc3/0x120 net/socket.c:632 ___sys_sendmsg+0x7bb/0x8e0 net/socket.c:2115 __sys_sendmsg net/socket.c:2153 [inline] __do_sys_sendmsg net/socket.c:2162 [inline] __se_sys_sendmsg net/socket.c:2160 [inline] __x64_sys_sendmsg+0x132/0x220 net/socket.c:2160 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff888098c8b0c0 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 511 bytes inside of 512-byte region [ffff888098c8b0c0, ffff888098c8b2c0) The buggy address belongs to the page: page:ffffea00026322c0 count:1 mapcount:0 mapping:ffff88812c39c940 index:0x0 flags: 0xfffe0000000100(slab) raw: 00fffe0000000100 ffffea000265f408 ffffea00027ade08 ffff88812c39c940 raw: 0000000000000000 ffff888098c8b0c0 0000000100000006 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888098c8b180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888098c8b200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888098c8b280: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ^ ffff888098c8b300: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00 ffff888098c8b380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================