Debian GNU/Linux 7 syzkaller ttyS0 executing program syzkaller login: [ 16.856821] ================================================================== [ 16.857585] BUG: KASAN: use-after-free in tipc_group_self+0x1a2/0x1b0 [ 16.858198] Read of size 4 at addr ffff88006d00066c by task syzkaller694842/2985 [ 16.858880] [ 16.859040] CPU: 3 PID: 2985 Comm: syzkaller694842 Not tainted 4.14.0-rc5-next-20171018+ #8 [ 16.859799] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 [ 16.860880] Call Trace: [ 16.861284] dump_stack+0x194/0x257 [ 16.861639] ? arch_local_irq_restore+0x53/0x53 [ 16.862068] ? show_regs_print_info+0x65/0x65 [ 16.862492] ? tipc_group_self+0x1a2/0x1b0 [ 16.862888] print_address_description+0x73/0x250 [ 16.863340] ? tipc_group_self+0x1a2/0x1b0 [ 16.863735] kasan_report+0x25b/0x340 [ 16.864207] __asan_report_load4_noabort+0x14/0x20 [ 16.864849] tipc_group_self+0x1a2/0x1b0 [ 16.865164] tipc_sk_leave+0xfc/0x200 [ 16.865453] ? tipc_sk_withdraw+0x6b0/0x6b0 [ 16.865771] ? __local_bh_enable_ip+0x9d/0x160 [ 16.866114] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 16.866479] ? lock_sock_nested+0x91/0x110 [ 16.866789] ? trace_hardirqs_on+0xd/0x10 [ 16.867097] ? __local_bh_enable_ip+0x9d/0x160 [ 16.867438] tipc_release+0x154/0xfe0 [ 16.867755] ? mntput_no_expire+0x130/0xa90 [ 16.868085] ? tipc_sk_backlog_rcv+0x370/0x370 [ 16.868422] ? lock_release+0xa40/0xa40 [ 16.868714] ? dentry_free+0xcd/0x130 [ 16.868998] ? rcu_read_lock_sched_held+0x108/0x120 [ 16.869367] ? kmem_cache_free+0x249/0x280 [ 16.869783] ? dentry_free+0xd2/0x130 [ 16.870109] ? locks_remove_file+0x3fa/0x5a0 [ 16.870470] ? fcntl_setlk+0x10c0/0x10c0 [ 16.870775] ? __fsnotify_parent+0xb4/0x3a0 [ 16.871107] ? fsnotify+0x1af0/0x1af0 [ 16.871423] ? rcu_note_context_switch+0x710/0x710 [ 16.871840] sock_release+0x8d/0x1e0 [ 16.872130] ? sock_release+0x1e0/0x1e0 [ 16.872433] sock_close+0x16/0x20 [ 16.872717] __fput+0x327/0x7e0 [ 16.872996] ? fput+0x140/0x140 [ 16.873259] ? trace_event_raw_event_sched_switch+0x8a0/0x8a0 [ 16.873839] ? _raw_spin_unlock_irq+0x27/0x70 [ 16.874181] ____fput+0x15/0x20 [ 16.874430] task_work_run+0x199/0x270 [ 16.874723] ? task_work_cancel+0x210/0x210 [ 16.875059] ? _raw_spin_unlock+0x22/0x30 [ 16.875383] ? switch_task_namespaces+0x87/0xc0 [ 16.875768] do_exit+0x9b5/0x1ad0 [ 16.876046] ? mm_update_next_owner+0x930/0x930 [ 16.876403] ? reacquire_held_locks+0x1fd/0x3d0 [ 16.876806] ? find_held_lock+0x35/0x1d0 [ 16.877186] ? release_sock+0x1d4/0x2a0 [ 16.877646] ? lock_downgrade+0x990/0x990 [ 16.878035] ? lock_downgrade+0x990/0x990 [ 16.878423] ? do_raw_spin_trylock+0x190/0x190 [ 16.878856] ? tipc_group_delete+0x2c0/0x3c0 [ 16.879265] ? __local_bh_enable_ip+0x9d/0x160 [ 16.879652] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 16.879964] ? trace_hardirqs_on+0xd/0x10 [ 16.880228] ? __local_bh_enable_ip+0x9d/0x160 [ 16.880518] ? release_sock+0x1d4/0x2a0 [ 16.880773] ? tipc_nametbl_build_group+0x27a/0x370 [ 16.881538] ? tipc_setsockopt+0x703/0xc00 [ 16.881846] ? tipc_sk_leave+0x200/0x200 [ 16.882169] ? security_socket_setsockopt+0x89/0xb0 [ 16.882513] ? SyS_setsockopt+0x215/0x360 [ 16.882789] do_group_exit+0x149/0x400 [ 16.883124] ? SyS_recv+0x40/0x40 [ 16.883442] ? SyS_exit+0x30/0x30 [ 16.883765] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 16.884228] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 16.884677] SyS_exit_group+0x1d/0x20 [ 16.885034] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 16.885521] RIP: 0033:0x433a29 [ 16.885821] RSP: 002b:00007ffeb1904e28 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 16.886511] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000433a29 [ 16.887170] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 [ 16.887826] RBP: 0000000000000082 R08: 000000000000003c R09: 00000000000000e7 [ 16.888479] R10: ffffffffffffffc0 R11: 0000000000000246 R12: 0000000000000000 [ 16.888965] R13: 0000000000401860 R14: 00000000004018f0 R15: 0000000000000000 [ 16.889484] [ 16.889633] Allocated by task 2985: [ 16.889864] save_stack+0x43/0xd0 [ 16.890137] kasan_kmalloc+0xad/0xe0 [ 16.890473] kmem_cache_alloc_trace+0x136/0x750 [ 16.890896] tipc_group_create+0x116/0x9c0 [ 16.891279] tipc_setsockopt+0x25e/0xc00 [ 16.891651] SyS_setsockopt+0x189/0x360 [ 16.892019] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 16.892320] [ 16.892422] Freed by task 2985: [ 16.892625] save_stack+0x43/0xd0 [ 16.892832] kasan_slab_free+0x71/0xc0 [ 16.893111] kfree+0xca/0x250 [ 16.893300] tipc_group_delete+0x2c0/0x3c0 [ 16.893628] tipc_setsockopt+0xb33/0xc00 [ 16.893871] SyS_setsockopt+0x189/0x360 [ 16.894149] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 16.894432] [ 16.894533] The buggy address belongs to the object at ffff88006d000600 [ 16.894533] which belongs to the cache kmalloc-192 of size 192 [ 16.895302] The buggy address is located 108 bytes inside of [ 16.895302] 192-byte region [ffff88006d000600, ffff88006d0006c0) [ 16.896009] The buggy address belongs to the page: [ 16.896309] page:ffffea0001b40000 count:1 mapcount:0 mapping:ffff88006d000000 index:0xffff88006d000700 [ 16.896887] flags: 0x500000000000100(slab) [ 16.897175] raw: 0500000000000100 ffff88006d000000 ffff88006d000700 0000000100000008 [ 16.897813] raw: ffffea0001a9d2a0 ffffea0001b69d20 ffff88003e800040 0000000000000000 [ 16.898325] page dumped because: kasan: bad access detected [ 16.898672] [ 16.898772] Memory state around the buggy address: [ 16.899084] ffff88006d000500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 16.899515] ffff88006d000580: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc [ 16.899967] >ffff88006d000600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 16.900414] ^ [ 16.900827] ffff88006d000680: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 16.901290] ffff88006d000700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 16.901805] ================================================================== [ 16.902284] Disabling lock debugging due to kernel taint [ 16.902898] Kernel panic - not syncing: panic_on_warn set ... [ 16.902898] [ 16.903365] CPU: 3 PID: 2985 Comm: syzkaller694842 Tainted: G B 4.14.0-rc5-next-20171018+ #8 [ 16.903945] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 [ 16.904475] Call Trace: [ 16.904648] dump_stack+0x194/0x257 [ 16.904905] ? arch_local_irq_restore+0x53/0x53 [ 16.905324] ? kasan_end_report+0x32/0x50 [ 16.905736] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 16.906180] ? vsnprintf+0x1ed/0x1900 [ 16.906539] ? tipc_group_self+0xb0/0x1b0 [ 16.906863] panic+0x1e4/0x41c [ 16.907103] ? refcount_error_report+0x214/0x214 [ 16.907450] ? add_taint+0x1c/0x50 [ 16.907709] ? add_taint+0x1c/0x50 [ 16.907972] ? tipc_group_self+0x1a2/0x1b0 [ 16.908281] kasan_end_report+0x50/0x50 [ 16.908574] kasan_report+0x144/0x340 [ 16.908866] __asan_report_load4_noabort+0x14/0x20 [ 16.909245] tipc_group_self+0x1a2/0x1b0 [ 16.909662] tipc_sk_leave+0xfc/0x200 [ 16.909944] ? tipc_sk_withdraw+0x6b0/0x6b0 [ 16.910258] ? __local_bh_enable_ip+0x9d/0x160 [ 16.910589] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 16.911018] ? lock_sock_nested+0x91/0x110 [ 16.911412] ? trace_hardirqs_on+0xd/0x10 [ 16.911799] ? __local_bh_enable_ip+0x9d/0x160 [ 16.912229] tipc_release+0x154/0xfe0 [ 16.912568] ? mntput_no_expire+0x130/0xa90 [ 16.912828] ? tipc_sk_backlog_rcv+0x370/0x370 [ 16.913111] ? lock_release+0xa40/0xa40 [ 16.913348] ? dentry_free+0xcd/0x130 [ 16.913707] ? rcu_read_lock_sched_held+0x108/0x120 [ 16.914219] ? kmem_cache_free+0x249/0x280 [ 16.914473] ? dentry_free+0xd2/0x130 [ 16.914701] ? locks_remove_file+0x3fa/0x5a0 [ 16.914967] ? fcntl_setlk+0x10c0/0x10c0 [ 16.915220] ? __fsnotify_parent+0xb4/0x3a0 [ 16.915478] ? fsnotify+0x1af0/0x1af0 [ 16.915709] ? rcu_note_context_switch+0x710/0x710 [ 16.916019] sock_release+0x8d/0x1e0 [ 16.916251] ? sock_release+0x1e0/0x1e0 [ 16.916494] sock_close+0x16/0x20 [ 16.916709] __fput+0x327/0x7e0 [ 16.916911] ? fput+0x140/0x140 [ 16.917124] ? trace_event_raw_event_sched_switch+0x8a0/0x8a0 [ 16.917556] ? _raw_spin_unlock_irq+0x27/0x70 [ 16.917976] ____fput+0x15/0x20 [ 16.918284] task_work_run+0x199/0x270 [ 16.918647] ? task_work_cancel+0x210/0x210 [ 16.919050] ? _raw_spin_unlock+0x22/0x30 [ 16.919434] ? switch_task_namespaces+0x87/0xc0 [ 16.919864] do_exit+0x9b5/0x1ad0 [ 16.920187] ? mm_update_next_owner+0x930/0x930 [ 16.920617] ? reacquire_held_locks+0x1fd/0x3d0 [ 16.921049] ? find_held_lock+0x35/0x1d0 [ 16.921504] ? release_sock+0x1d4/0x2a0 [ 16.921799] ? lock_downgrade+0x990/0x990 [ 16.922058] ? lock_downgrade+0x990/0x990 [ 16.922306] ? do_raw_spin_trylock+0x190/0x190 [ 16.922584] ? tipc_group_delete+0x2c0/0x3c0 [ 16.922862] ? __local_bh_enable_ip+0x9d/0x160 [ 16.923155] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 16.923452] ? trace_hardirqs_on+0xd/0x10 [ 16.923698] ? __local_bh_enable_ip+0x9d/0x160 [ 16.923971] ? release_sock+0x1d4/0x2a0 [ 16.924222] ? tipc_nametbl_build_group+0x27a/0x370 [ 16.924525] ? tipc_setsockopt+0x703/0xc00 [ 16.925123] ? tipc_sk_leave+0x200/0x200 [ 16.925421] ? security_socket_setsockopt+0x89/0xb0 [ 16.925737] ? SyS_setsockopt+0x215/0x360 [ 16.925998] do_group_exit+0x149/0x400 [ 16.926238] ? SyS_recv+0x40/0x40 [ 16.926449] ? SyS_exit+0x30/0x30 [ 16.926655] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 16.926962] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 16.927253] SyS_exit_group+0x1d/0x20 [ 16.927481] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 16.927866] RIP: 0033:0x433a29 [ 16.928156] RSP: 002b:00007ffeb1904e28 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 16.928735] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000433a29 [ 16.929207] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 [ 16.929870] RBP: 0000000000000082 R08: 000000000000003c R09: 00000000000000e7 [ 16.930456] R10: ffffffffffffffc0 R11: 0000000000000246 R12: 0000000000000000 [ 16.930895] R13: 0000000000401860 R14: 00000000004018f0 R15: 0000000000000000 [ 16.931385] Dumping ftrace buffer: [ 16.931602] (ftrace buffer empty) [ 16.931824] Kernel Offset: disabled [ 16.932054] Rebooting in 86400 seconds..