EXT4-fs error (device loop2): ext4_fill_super:4448: inode #2: comm syz-executor.2: iget: bad i_size value: -43701554229800960 ================================================================== BUG: KASAN: use-after-free in constant_test_bit arch/x86/include/asm/bitops.h:317 [inline] BUG: KASAN: use-after-free in sock_flag include/net/sock.h:839 [inline] BUG: KASAN: use-after-free in l2cap_sock_kill+0xdb/0x100 net/bluetooth/l2cap_sock.c:1046 Read of size 8 at addr ffff8880a063ebe0 by task syz-executor.3/26891 CPU: 0 PID: 26891 Comm: syz-executor.3 Not tainted 4.19.146-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: EXT4-fs (loop2): get root inode failed __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x22c/0x33e lib/dump_stack.c:118 print_address_description.cold+0x56/0x25c mm/kasan/report.c:256 kasan_report_error.cold+0x66/0xb9 mm/kasan/report.c:354 kasan_report mm/kasan/report.c:412 [inline] __asan_report_load8_noabort+0x88/0x90 mm/kasan/report.c:433 constant_test_bit arch/x86/include/asm/bitops.h:317 [inline] sock_flag include/net/sock.h:839 [inline] l2cap_sock_kill+0xdb/0x100 net/bluetooth/l2cap_sock.c:1046 EXT4-fs (loop2): mount failed l2cap_conn_del+0x3db/0x6b0 net/bluetooth/l2cap_core.c:1730 l2cap_disconn_cfm net/bluetooth/l2cap_core.c:7435 [inline] l2cap_disconn_cfm+0x85/0xa0 net/bluetooth/l2cap_core.c:7428 hci_disconn_cfm include/net/bluetooth/hci_core.h:1261 [inline] hci_conn_hash_flush+0x114/0x220 net/bluetooth/hci_conn.c:1495 hci_dev_do_close+0x623/0xe70 net/bluetooth/hci_core.c:1666 hci_unregister_dev+0x17c/0x7f0 net/bluetooth/hci_core.c:3271 vhci_release+0x70/0xe0 drivers/bluetooth/hci_vhci.c:354 __fput+0x2ce/0x8a0 fs/file_table.c:278 task_work_run+0x141/0x1c0 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0xc09/0x2d80 kernel/exit.c:887 do_group_exit+0x125/0x320 kernel/exit.c:990 __do_sys_exit_group kernel/exit.c:1001 [inline] __se_sys_exit_group kernel/exit.c:999 [inline] __x64_sys_exit_group+0x3a/0x50 kernel/exit.c:999 do_syscall_64+0xf9/0x670 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45d5f9 Code: 5d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 2b b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffc94f1cd78 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 0000000000000016 RCX: 000000000045d5f9 RDX: 0000000000416e81 RSI: 00000000016a85f0 RDI: 0000000000000000 RBP: 00000000004c210f R08: 000000000000000c R09: 0000000000000000 R10: 0000000001d55940 R11: 0000000000000246 R12: 00007ffc94f1e020 R13: 0000000001d5eaa0 R14: 0000000000000000 R15: 00007ffc94f1f0b0 Allocated by task 27133: __do_kmalloc mm/slab.c:3727 [inline] __kmalloc+0x15a/0x4f0 mm/slab.c:3736 kmalloc include/linux/slab.h:520 [inline] sk_prot_alloc+0x1e2/0x2d0 net/core/sock.c:1466 sk_alloc+0x36/0x1100 net/core/sock.c:1520 l2cap_sock_alloc.constprop.0+0x31/0x210 net/bluetooth/l2cap_sock.c:1590 l2cap_sock_create+0x110/0x1b0 net/bluetooth/l2cap_sock.c:1636 bt_sock_create+0x1d0/0x470 net/bluetooth/af_bluetooth.c:130 __sock_create+0x495/0x820 net/socket.c:1276 sock_create net/socket.c:1316 [inline] __sys_socket+0xef/0x200 net/socket.c:1346 __do_sys_socket net/socket.c:1355 [inline] __se_sys_socket net/socket.c:1353 [inline] __x64_sys_socket+0x6f/0xb0 net/socket.c:1353 do_syscall_64+0xf9/0x670 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 27128: __cache_free mm/slab.c:3503 [inline] kfree+0xcc/0x250 mm/slab.c:3822 sk_prot_free net/core/sock.c:1503 [inline] __sk_destruct+0x61d/0x830 net/core/sock.c:1584 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 sock_put include/net/sock.h:1711 [inline] l2cap_sock_kill+0xd4/0x100 net/bluetooth/l2cap_sock.c:1055 l2cap_sock_release+0xd9/0x100 net/bluetooth/l2cap_sock.c:1204 __sock_release+0xcd/0x2a0 net/socket.c:579 sock_close+0x15/0x20 net/socket.c:1140 __fput+0x2ce/0x8a0 fs/file_table.c:278 task_work_run+0x141/0x1c0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:193 [inline] exit_to_usermode_loop+0x269/0x2c0 arch/x86/entry/common.c:167 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath arch/x86/entry/common.c:271 [inline] do_syscall_64+0x57c/0x670 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8880a063eb80 which belongs to the cache kmalloc-2048 of size 2048 The buggy address is located 96 bytes inside of 2048-byte region [ffff8880a063eb80, ffff8880a063f380) The buggy address belongs to the page: page:ffffea0002818f80 count:1 mapcount:0 mapping:ffff88812c3f6c40 index:0x0 compound_mapcount: 0 flags: 0xfffe0000008100(slab|head) raw: 00fffe0000008100 ffffea00024c2e08 ffffea000217cf88 ffff88812c3f6c40 raw: 0000000000000000 ffff8880a063e300 0000000100000003 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a063ea80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880a063eb00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8880a063eb80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880a063ec00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880a063ec80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================