Debian GNU/Linux 7 syzkaller ttyS0 2017/09/12 06:25:00 parsed 1 programs 2017/09/12 06:25:00 executed programs: 0 syzkaller login: [ 33.257572] dev_remove_pack: ffff88003c79b300 not found [ 33.280142] ================================================================== [ 33.281008] BUG: KASAN: use-after-free in __dev_remove_pack+0x305/0x3b0 [ 33.281579] Read of size 8 at addr ffff88003cf5aa68 by task syz-executor0/2982 [ 33.282143] [ 33.282265] CPU: 3 PID: 2982 Comm: syz-executor0 Not tainted 4.13.0-next-20170912+ #2 [ 33.282860] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 [ 33.283445] Call Trace: [ 33.283637] dump_stack+0x194/0x257 [ 33.283929] ? arch_local_irq_restore+0x53/0x53 [ 33.284299] ? show_regs_print_info+0x65/0x65 [ 33.284656] ? __dev_remove_pack+0x305/0x3b0 [ 33.284981] print_address_description+0x73/0x250 [ 33.285331] ? __dev_remove_pack+0x305/0x3b0 [ 33.285649] kasan_report+0x24e/0x340 [ 33.285927] __asan_report_load8_noabort+0x14/0x20 [ 33.286306] __dev_remove_pack+0x305/0x3b0 [ 33.286614] ? dev_get_by_name_rcu+0x270/0x270 [ 33.287001] ? refcount_sub_and_test+0x115/0x1b0 [ 33.287441] __unregister_prot_hook+0x211/0x280 [ 33.287870] packet_release+0x8bb/0xd70 [ 33.288250] ? packet_set_ring+0x1b70/0x1b70 [ 33.288748] ? dentry_free+0xcd/0x130 [ 33.289121] ? rcu_read_lock_sched_held+0x108/0x120 [ 33.289641] ? kmem_cache_free+0x249/0x280 [ 33.290082] ? dentry_free+0xd2/0x130 [ 33.290486] ? locks_remove_file+0x3fa/0x5a0 [ 33.290915] ? fcntl_setlk+0x10d0/0x10d0 [ 33.291301] ? __fsnotify_parent+0xb4/0x3a0 [ 33.291700] ? fsnotify+0x1af0/0x1af0 [ 33.292266] sock_release+0x8d/0x1e0 [ 33.292580] ? sock_release+0x8d/0x1e0 [ 33.292879] ? sock_release+0x1e0/0x1e0 [ 33.293203] sock_close+0x16/0x20 [ 33.293476] __fput+0x333/0x7f0 [ 33.293742] ? fput+0x140/0x140 [ 33.294029] ? check_same_owner+0x320/0x320 [ 33.294331] ? _raw_spin_unlock_irq+0x27/0x70 [ 33.294654] ____fput+0x15/0x20 [ 33.294941] task_work_run+0x199/0x270 [ 33.295245] ? task_work_cancel+0x210/0x210 [ 33.295579] ? _raw_spin_unlock+0x22/0x30 [ 33.295875] ? switch_task_namespaces+0x87/0xc0 [ 33.296270] do_exit+0xa52/0x1b40 [ 33.296543] ? do_raw_spin_trylock+0x190/0x190 [ 33.296942] ? SyS_setgroups+0x250/0x250 [ 33.297307] ? mm_update_next_owner+0x930/0x930 [ 33.297633] ? sched_clock+0x31/0x40 [ 33.297925] ? trace_hardirqs_off+0xd/0x10 [ 33.298239] ? _raw_spin_unlock_irqrestore+0xa6/0xba [ 33.298609] ? try_to_wake_up+0x115/0x1850 [ 33.298920] ? find_held_lock+0x39/0x1d0 [ 33.299237] ? check_noncircular+0x20/0x20 [ 33.299603] ? migrate_swap_stop+0x970/0x970 [ 33.299926] ? do_nanosleep+0x508/0x6f0 [ 33.300250] ? schedule_timeout_idle+0x90/0x90 [ 33.300573] ? find_held_lock+0x39/0x1d0 [ 33.300874] ? lock_downgrade+0x990/0x990 [ 33.301173] ? do_group_exit+0x1fe/0x400 [ 33.301461] ? nanosleep_copyout+0x100/0x100 [ 33.301827] ? do_raw_spin_trylock+0x190/0x190 [ 33.302215] ? signal_wake_up_state+0x3a/0x40 [ 33.302611] ? zap_other_threads+0x1ca/0x240 [ 33.302949] ? force_sig+0x30/0x30 [ 33.303199] ? _raw_spin_unlock_irq+0x27/0x70 [ 33.303540] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 33.303923] do_group_exit+0x149/0x400 [ 33.304227] ? SyS_exit+0x30/0x30 [ 33.304471] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 33.304957] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 33.305393] SyS_exit_group+0x1d/0x20 [ 33.305793] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 33.306242] RIP: 0033:0x447299 [ 33.306542] RSP: 002b:00007ffdbade3da8 EFLAGS: 00000202 ORIG_RAX: 00000000000000e7 [ 33.307266] RAX: ffffffffffffffda RBX: 00000000000081ae RCX: 0000000000447299 [ 33.308006] RDX: 0000000000000000 RSI: 0000000000750698 RDI: 0000000000000000 [ 33.308682] RBP: 0000000000000082 R08: 0000000d00000007 R09: 0000000000000ba3 [ 33.309392] R10: 0000000000000000 R11: 0000000000000202 R12: fffffffffffffffe [ 33.310123] R13: 00000000007080dc R14: 0000000000000005 R15: 00000000208e3000 [ 33.310796] [ 33.310977] Allocated by task 2983: [ 33.311374] save_stack_trace+0x16/0x20 [ 33.311751] save_stack+0x43/0xd0 [ 33.312092] kasan_kmalloc+0xad/0xe0 [ 33.312452] kmem_cache_alloc_trace+0x136/0x750 [ 33.312919] fanout_add+0xa50/0x1190 [ 33.313259] packet_setsockopt+0xfdc/0x1e80 [ 33.314141] SyS_setsockopt+0x189/0x360 [ 33.314442] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 33.314810] [ 33.314973] Freed by task 2982: [ 33.315283] save_stack_trace+0x16/0x20 [ 33.315565] save_stack+0x43/0xd0 [ 33.315869] kasan_slab_free+0x71/0xc0 [ 33.316247] kfree+0xca/0x250 [ 33.316478] packet_release+0xa8f/0xd70 [ 33.316796] sock_release+0x8d/0x1e0 [ 33.317104] sock_close+0x16/0x20 [ 33.317380] __fput+0x333/0x7f0 [ 33.317614] ____fput+0x15/0x20 [ 33.317883] task_work_run+0x199/0x270 [ 33.318187] do_exit+0xa52/0x1b40 [ 33.318535] do_group_exit+0x149/0x400 [ 33.318909] SyS_exit_group+0x1d/0x20 [ 33.319241] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 33.319597] [ 33.319757] The buggy address belongs to the object at ffff88003cf5a1c0 [ 33.319757] which belongs to the cache kmalloc-4096 of size 4096 [ 33.320707] The buggy address is located 2216 bytes inside of [ 33.320707] 4096-byte region [ffff88003cf5a1c0, ffff88003cf5b1c0) [ 33.321550] The buggy address belongs to the page: [ 33.321894] page:ffffea0000f3d680 count:1 mapcount:0 mapping:ffff88003cf5a1c0 index:0x0 compound_mapcount: 0 [ 33.322647] flags: 0x100000000008100(slab|head) [ 33.323008] raw: 0100000000008100 ffff88003cf5a1c0 0000000000000000 0000000100000001 [ 33.323565] raw: ffffea0000f3d620 ffffea0000f4bda0 ffff88003e800dc0 0000000000000000 [ 33.324188] page dumped because: kasan: bad access detected [ 33.324597] [ 33.324724] Memory state around the buggy address: [ 33.325062] ffff88003cf5a900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 33.325570] ffff88003cf5a980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 33.326078] >ffff88003cf5aa00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 33.326617] ^ [ 33.327114] ffff88003cf5aa80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 33.327761] ffff88003cf5ab00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 33.328358] ================================================================== [ 33.328854] Disabling lock debugging due to kernel taint [ 33.329332] Kernel panic - not syncing: panic_on_warn set ... [ 33.329332] [ 33.330067] CPU: 3 PID: 2982 Comm: syz-executor0 Tainted: G B 4.13.0-next-20170912+ #2 [ 33.330748] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 [ 33.331392] Call Trace: [ 33.331601] dump_stack+0x194/0x257 [ 33.331876] ? arch_local_irq_restore+0x53/0x53 [ 33.332249] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 33.332612] ? __dev_remove_pack+0x2f0/0x3b0 [ 33.332949] panic+0x1e4/0x417 [ 33.333237] ? __warn+0x1d9/0x1d9 [ 33.333531] ? __dev_remove_pack+0x305/0x3b0 [ 33.333841] kasan_end_report+0x50/0x50 [ 33.334135] kasan_report+0x137/0x340 [ 33.334435] __asan_report_load8_noabort+0x14/0x20 [ 33.334817] __dev_remove_pack+0x305/0x3b0 [ 33.335518] ? dev_get_by_name_rcu+0x270/0x270 [ 33.335923] ? refcount_sub_and_test+0x115/0x1b0 [ 33.336293] __unregister_prot_hook+0x211/0x280 [ 33.336680] packet_release+0x8bb/0xd70 [ 33.336984] ? packet_set_ring+0x1b70/0x1b70 [ 33.337316] ? dentry_free+0xcd/0x130 [ 33.337604] ? rcu_read_lock_sched_held+0x108/0x120 [ 33.338053] ? kmem_cache_free+0x249/0x280 [ 33.338395] ? dentry_free+0xd2/0x130 [ 33.338680] ? locks_remove_file+0x3fa/0x5a0 [ 33.338999] ? fcntl_setlk+0x10d0/0x10d0 [ 33.339322] ? __fsnotify_parent+0xb4/0x3a0 [ 33.339659] ? fsnotify+0x1af0/0x1af0 [ 33.339945] sock_release+0x8d/0x1e0 [ 33.340255] ? sock_release+0x8d/0x1e0 [ 33.340568] ? sock_release+0x1e0/0x1e0 [ 33.340883] sock_close+0x16/0x20 [ 33.341184] __fput+0x333/0x7f0 [ 33.341425] ? fput+0x140/0x140 [ 33.341683] ? check_same_owner+0x320/0x320 [ 33.342048] ? _raw_spin_unlock_irq+0x27/0x70 [ 33.342371] ____fput+0x15/0x20 [ 33.342611] task_work_run+0x199/0x270 [ 33.342930] ? task_work_cancel+0x210/0x210 [ 33.343269] ? _raw_spin_unlock+0x22/0x30 [ 33.343607] ? switch_task_namespaces+0x87/0xc0 [ 33.343964] do_exit+0xa52/0x1b40 [ 33.344255] ? do_raw_spin_trylock+0x190/0x190 [ 33.344637] ? SyS_setgroups+0x250/0x250 [ 33.344985] ? mm_update_next_owner+0x930/0x930 [ 33.345370] ? sched_clock+0x31/0x40 [ 33.345639] ? trace_hardirqs_off+0xd/0x10 [ 33.345965] ? _raw_spin_unlock_irqrestore+0xa6/0xba [ 33.346381] ? try_to_wake_up+0x115/0x1850 [ 33.346691] ? find_held_lock+0x39/0x1d0 [ 33.346993] ? check_noncircular+0x20/0x20 [ 33.347339] ? migrate_swap_stop+0x970/0x970 [ 33.347682] ? do_nanosleep+0x508/0x6f0 [ 33.348007] ? schedule_timeout_idle+0x90/0x90 [ 33.348322] ? find_held_lock+0x39/0x1d0 [ 33.348631] ? lock_downgrade+0x990/0x990 [ 33.348973] ? do_group_exit+0x1fe/0x400 [ 33.349309] ? nanosleep_copyout+0x100/0x100 [ 33.349642] ? do_raw_spin_trylock+0x190/0x190 [ 33.350007] ? signal_wake_up_state+0x3a/0x40 [ 33.350333] ? zap_other_threads+0x1ca/0x240 [ 33.350664] ? force_sig+0x30/0x30 [ 33.350918] ? _raw_spin_unlock_irq+0x27/0x70 [ 33.351285] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 33.351659] do_group_exit+0x149/0x400 [ 33.351966] ? SyS_exit+0x30/0x30 [ 33.352222] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 33.352608] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 33.352976] SyS_exit_group+0x1d/0x20 [ 33.353223] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 33.353534] RIP: 0033:0x447299 [ 33.353740] RSP: 002b:00007ffdbade3da8 EFLAGS: 00000202 ORIG_RAX: 00000000000000e7 [ 33.354256] RAX: ffffffffffffffda RBX: 00000000000081ae RCX: 0000000000447299 [ 33.354805] RDX: 0000000000000000 RSI: 0000000000750698 RDI: 0000000000000000 [ 33.355308] RBP: 0000000000000082 R08: 0000000d00000007 R09: 0000000000000ba3 [ 33.355856] R10: 0000000000000000 R11: 0000000000000202 R12: fffffffffffffffe [ 33.356701] R13: 00000000007080dc R14: 0000000000000005 R15: 00000000208e3000 [ 33.357290] Dumping ftrace buffer: [ 33.357534] (ftrace buffer empty) [ 33.357840] Kernel Offset: disabled [ 33.358126] Rebooting in 86400 seconds..