================================================================== BUG: KASAN: slab-out-of-bounds in hci_le_direct_adv_report_evt net/bluetooth/hci_event.c:5875 [inline] BUG: KASAN: slab-out-of-bounds in hci_le_meta_evt+0x3937/0x3ff0 net/bluetooth/hci_event.c:5939 Read of size 1 at addr ffff8880a27f5e0c by task kworker/u5:0/1542 CPU: 0 PID: 1542 Comm: kworker/u5:0 Not tainted 5.8.0-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+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:5875 [inline] hci_le_meta_evt+0x3937/0x3ff0 net/bluetooth/hci_event.c:5939 hci_event_packet+0x2e25/0x87a8 net/bluetooth/hci_event.c:6192 hci_rx_work+0x22e/0xb50 net/bluetooth/hci_core.c:4889 process_one_work+0x94c/0x1670 kernel/workqueue.c:2269 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415 kthread+0x3b5/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Allocated by task 23215: 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:1084 [inline] bt_skb_alloc include/net/bluetooth/bluetooth.h:389 [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:1872 [inline] new_sync_write+0x422/0x650 fs/read_write.c:503 vfs_write+0x5ad/0x730 fs/read_write.c:578 ksys_write+0x12d/0x250 fs/read_write.c:631 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Freed by task 22968: 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 sctp_endpoint_destroy+0x1b5/0x240 net/sctp/endpointola.c:220 sctp_endpoint_put net/sctp/endpointola.c:236 [inline] sctp_endpoint_free+0xd6/0x110 net/sctp/endpointola.c:183 sctp_destroy_sock+0x9c/0x3c0 net/sctp/socket.c:4981 sk_common_release+0x64/0x390 net/core/sock.c:3254 sctp_close+0x4ce/0x8b0 net/sctp/socket.c:1533 inet_release+0x12e/0x280 net/ipv4/af_inet.c:431 __sock_release+0xcd/0x280 net/socket.c:596 sock_close+0x18/0x20 net/socket.c:1277 __fput+0x285/0x920 fs/file_table.c:281 task_work_run+0xdd/0x190 kernel/task_work.c:135 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_user_mode_loop kernel/entry/common.c:139 [inline] exit_to_user_mode_prepare+0x1aa/0x1d0 kernel/entry/common.c:166 syscall_exit_to_user_mode+0x59/0x2b0 kernel/entry/common.c:241 entry_SYSCALL_64_after_hwframe+0x44/0xa9 The buggy address belongs to the object at ffff8880a27f5c00 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 12 bytes to the right of 512-byte region [ffff8880a27f5c00, ffff8880a27f5e00) The buggy address belongs to the page: page:ffffea000289fd40 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 flags: 0xfffe0000000200(slab) raw: 00fffe0000000200 ffffea000286a288 ffffea00027fc908 ffff8880aa040a80 raw: 0000000000000000 ffff8880a27f5000 0000000100000004 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a27f5d00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880a27f5d80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8880a27f5e00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff8880a27f5e80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880a27f5f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================