netem: change failed ================================================================== 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 ffff88805ba873e8 by task syz-executor.4/22653 CPU: 0 PID: 22653 Comm: syz-executor.4 Not tainted 4.14.194-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:5595 [inline] net_rx_action+0x466/0xfd0 net/core/dev.c:5661 __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:arch_local_irq_restore arch/x86/include/asm/paravirt.h:779 [inline] RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0xa3/0xe0 kernel/locking/spinlock.c:192 RSP: 0018:ffff88805a527640 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff10 RAX: 1ffffffff0fa2d21 RBX: 0000000000000286 RCX: 1ffff110125b71e2 RDX: dffffc0000000000 RSI: ffff888092db8f18 RDI: 0000000000000286 RBP: ffffffff87d88320 R08: ffff8880aeb2beb0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000286 R13: ffff888092db89d8 R14: ffff888092db89c8 R15: 0000000000000000 rcu_read_unlock_special+0x8db/0xdd0 kernel/rcu/tree_plugin.h:526 __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:2486 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: 0033:0x45d579 RSP: 002b:00007fdaba2fcc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 0000000000021b40 RCX: 000000000045d579 RDX: 0000000000000020 RSI: 00000000000040c2 RDI: 00000000200002c0 RBP: 000000000118cf80 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cf4c R13: 00007fffc938e99f R14: 00007fdaba2fd9c0 R15: 000000000118cf4c Allocated by task 22647: 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 22644: 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 ffff88805ba86c00 which belongs to the cache kmalloc-2048 of size 2048 The buggy address is located 2024 bytes inside of 2048-byte region [ffff88805ba86c00, ffff88805ba87400) The buggy address belongs to the page: page:ffffea00016ea180 count:1 mapcount:0 mapping:ffff88805ba86380 index:0x0 compound_mapcount: 0 flags: 0xfffe0000008100(slab|head) raw: 00fffe0000008100 ffff88805ba86380 0000000000000000 0000000100000003 raw: ffffea000281c8a0 ffffea0001696520 ffff88812fe52c40 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88805ba87280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88805ba87300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88805ba87380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88805ba87400: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88805ba87480: 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