================================================================== BUG: KASAN: use-after-free in __read_once_size include/linux/compiler.h:183 [inline] BUG: KASAN: use-after-free in deliver_ptype_list_skb net/core/dev.c:1888 [inline] BUG: KASAN: use-after-free in __netif_receive_skb_core+0x23e1/0x2a30 net/core/dev.c:4462 Read of size 8 at addr ffff88805fbafd28 by task syz-executor.2/21778 CPU: 0 PID: 21778 Comm: syz-executor.2 Not tainted 4.14.198-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x283 lib/dump_stack.c:58 print_address_description.cold+0x54/0x1d3 mm/kasan/report.c:252 kasan_report_error.cold+0x8a/0x194 mm/kasan/report.c:351 kasan_report mm/kasan/report.c:409 [inline] __asan_report_load8_noabort+0x68/0x70 mm/kasan/report.c:430 __read_once_size include/linux/compiler.h:183 [inline] deliver_ptype_list_skb net/core/dev.c:1888 [inline] __netif_receive_skb_core+0x23e1/0x2a30 net/core/dev.c:4462 __netif_receive_skb+0x27/0x1a0 net/core/dev.c:4512 process_backlog+0x210/0x6f0 net/core/dev.c:5194 napi_poll net/core/dev.c:5596 [inline] net_rx_action+0x466/0xfd0 net/core/dev.c:5662 __do_softirq+0x254/0xa1d kernel/softirq.c:288 invoke_softirq kernel/softirq.c:368 [inline] irq_exit+0x193/0x240 kernel/softirq.c:409 exiting_irq arch/x86/include/asm/apic.h:648 [inline] smp_apic_timer_interrupt+0x141/0x5e0 arch/x86/kernel/apic/apic.c:1102 apic_timer_interrupt+0x93/0xa0 arch/x86/entry/entry_64.S:793 RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline] RIP: 0010:_raw_spin_unlock_irq+0x50/0x80 kernel/locking/spinlock.c:200 RSP: 0018:ffff8880558f7508 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff10 RAX: 1ffffffff0fa2d23 RBX: ffff888059c6c580 RCX: 1ffff1100b38d9ca RDX: dffffc0000000000 RSI: ffff888059c6ce58 RDI: ffff888059c6ce04 RBP: ffff8880aea2b580 R08: ffffffff8a0a3890 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880aea2b580 R13: ffff88809f278640 R14: 0000000000000000 R15: ffff8880aea2bed0 finish_lock_switch kernel/sched/sched.h:1352 [inline] finish_task_switch+0x178/0x610 kernel/sched/core.c:2675 context_switch kernel/sched/core.c:2811 [inline] __schedule+0x893/0x1de0 kernel/sched/core.c:3384 preempt_schedule_common+0x45/0xc0 kernel/sched/core.c:3508 ___preempt_schedule+0x16/0x18 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [inline] _raw_spin_unlock_irqrestore+0xaf/0xe0 kernel/locking/spinlock.c:192 __rcu_read_unlock+0x158/0x160 kernel/rcu/update.c:260 rcu_read_unlock include/linux/rcupdate.h:684 [inline] ext4_get_group_desc+0x193/0x430 fs/ext4/balloc.c:294 recently_deleted fs/ext4/ialloc.c:689 [inline] find_inode_bit+0x18b/0x4e0 fs/ext4/ialloc.c:733 __ext4_new_inode+0x1379/0x4eb0 fs/ext4/ialloc.c:925 ext4_create+0x244/0x520 fs/ext4/namei.c:2496 lookup_open+0x77a/0x1750 fs/namei.c:3241 do_last fs/namei.c:3334 [inline] path_openat+0xe08/0x2970 fs/namei.c:3569 do_filp_open+0x179/0x3c0 fs/namei.c:3603 do_sys_open+0x296/0x410 fs/open.c:1081 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x45e179 RSP: 002b:00007f13e1e6fc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 0000000000021e00 RCX: 000000000045e179 RDX: 0000000000000040 RSI: 000000002000c380 RDI: ffffffffffffff9c RBP: 000000000118cf88 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cf4c R13: 00007fff551d291f R14: 00007f13e1e709c0 R15: 000000000118cf4c Allocated by task 21782: save_stack mm/kasan/kasan.c:447 [inline] set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:551 __do_kmalloc mm/slab.c:3720 [inline] __kmalloc+0x15a/0x400 mm/slab.c:3729 kmalloc include/linux/slab.h:493 [inline] sk_prot_alloc+0x1ba/0x290 net/core/sock.c:1467 sk_alloc+0x36/0xcd0 net/core/sock.c:1521 packet_create+0xf5/0x7f0 net/packet/af_packet.c:3288 __sock_create+0x303/0x620 net/socket.c:1275 sock_create net/socket.c:1315 [inline] SYSC_socket net/socket.c:1345 [inline] SyS_socket+0xd1/0x1b0 net/socket.c:1325 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb Freed by task 21779: save_stack mm/kasan/kasan.c:447 [inline] set_track mm/kasan/kasan.c:459 [inline] kasan_slab_free+0xc3/0x1a0 mm/kasan/kasan.c:524 __cache_free mm/slab.c:3496 [inline] kfree+0xc9/0x250 mm/slab.c:3815 sk_prot_free net/core/sock.c:1504 [inline] __sk_destruct+0x577/0x6e0 net/core/sock.c:1582 sk_destruct net/core/sock.c:1597 [inline] __sk_free+0xd9/0x2d0 net/core/sock.c:1605 sk_free+0x2b/0x40 net/core/sock.c:1616 sock_put include/net/sock.h:1662 [inline] packet_release+0x837/0xa80 net/packet/af_packet.c:3117 __sock_release+0xcd/0x2b0 net/socket.c:602 sock_close+0x15/0x20 net/socket.c:1139 __fput+0x25f/0x7a0 fs/file_table.c:210 task_work_run+0x11f/0x190 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:191 [inline] exit_to_usermode_loop+0x1ad/0x200 arch/x86/entry/common.c:164 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x46/0xbb The buggy address belongs to the object at ffff88805fbaf540 which belongs to the cache kmalloc-2048 of size 2048 The buggy address is located 2024 bytes inside of 2048-byte region [ffff88805fbaf540, ffff88805fbafd40) The buggy address belongs to the page: page:ffffea00017eeb80 count:1 mapcount:0 mapping:ffff88805fbae440 index:0x0 compound_mapcount: 0 flags: 0xfffe0000008100(slab|head) raw: 00fffe0000008100 ffff88805fbae440 0000000000000000 0000000100000003 raw: ffffea0002608020 ffffea00027beb20 ffff88812fe50c40 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88805fbafc00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88805fbafc80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88805fbafd00: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ^ ffff88805fbafd80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88805fbafe00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================