================================================================== BUG: KASAN: slab-out-of-bounds in hci_inquiry_result_with_rssi_evt net/bluetooth/hci_event.c:3988 [inline] BUG: KASAN: slab-out-of-bounds in hci_event_packet+0xb33e/0xc22e net/bluetooth/hci_event.c:5863 Read of size 1 at addr ffff888093ef7f40 by task kworker/u5:0/1172 CPU: 0 PID: 1172 Comm: kworker/u5:0 Not tainted 4.20.0+ #13 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+0x1db/0x2d0 lib/dump_stack.c:113 print_address_description.cold+0x7c/0x20d mm/kasan/report.c:187 kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317 __asan_report_load1_noabort+0x14/0x20 mm/kasan/generic_report.c:132 hci_inquiry_result_with_rssi_evt net/bluetooth/hci_event.c:3988 [inline] hci_event_packet+0xb33e/0xc22e net/bluetooth/hci_event.c:5863 hci_rx_work+0x578/0xcd0 net/bluetooth/hci_core.c:4412 process_one_work+0xd0c/0x1ce0 kernel/workqueue.c:2153 worker_thread+0x143/0x14a0 kernel/workqueue.c:2296 kthread+0x357/0x430 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 Allocated by task 8060: save_stack+0x45/0xd0 mm/kasan/common.c:73 set_track mm/kasan/common.c:85 [inline] kasan_kmalloc mm/kasan/common.c:482 [inline] kasan_kmalloc+0xcf/0xe0 mm/kasan/common.c:455 __do_kmalloc_node mm/slab.c:3671 [inline] __kmalloc_node_track_caller+0x4e/0x70 mm/slab.c:3685 __kmalloc_reserve.isra.0+0x40/0xe0 net/core/skbuff.c:140 __alloc_skb+0x12d/0x730 net/core/skbuff.c:208 alloc_skb include/linux/skbuff.h:1011 [inline] bt_skb_alloc include/net/bluetooth/bluetooth.h:339 [inline] vhci_get_user drivers/bluetooth/hci_vhci.c:180 [inline] vhci_write+0xc4/0x470 drivers/bluetooth/hci_vhci.c:299 call_write_iter include/linux/fs.h:1862 [inline] new_sync_write fs/read_write.c:474 [inline] __vfs_write+0x764/0xb40 fs/read_write.c:487 vfs_write+0x20c/0x580 fs/read_write.c:549 ksys_write+0x105/0x260 fs/read_write.c:598 __do_sys_write fs/read_write.c:610 [inline] __se_sys_write fs/read_write.c:607 [inline] __x64_sys_write+0x73/0xb0 fs/read_write.c:607 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 0: (stack is not available) The buggy address belongs to the object at ffff888093ef7b40 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 0 bytes to the right of 1024-byte region [ffff888093ef7b40, ffff888093ef7f40) The buggy address belongs to the page: page:ffffea00024fbd80 count:1 mapcount:0 mapping:ffff88812c3f0ac0 index:0x0 compound_mapcount: 0 flags: 0x1fffc0000010200(slab|head) raw: 01fffc0000010200 ffffea00022c4588 ffff88812c3f1848 ffff88812c3f0ac0 raw: 0000000000000000 ffff888093ef6040 0000000100000007 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888093ef7e00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888093ef7e80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888093ef7f00: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ^ ffff888093ef7f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888093ef8000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================