================================================================== 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 ffff8880a42f2aa8 by task syz-executor.4/11720 CPU: 0 PID: 11720 Comm: syz-executor.4 Not tainted 4.14.228-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+0x1b2/0x281 lib/dump_stack.c:58 print_address_description.cold+0x54/0x1d3 mm/kasan/report.c:252 kasan_report_error.cold+0x8a/0x191 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+0x218/0x6f0 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+0x24d/0x9ff 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:638 [inline] smp_apic_timer_interrupt+0x141/0x5e0 arch/x86/kernel/apic/apic.c:1106 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:ffff88804633f540 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff10 RAX: 1ffffffff11e1259 RBX: 0000000000000286 RCX: 1ffff110169bd19a RDX: dffffc0000000000 RSI: ffff8880b4de8cd8 RDI: 0000000000000286 RBP: ffffffff88f79b00 R08: ffff8880b4de8790 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000286 R13: ffff8880b4de8798 R14: ffff8880b4de8788 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] is_bpf_text_address+0x9b/0x150 kernel/bpf/core.c:458 kernel_text_address kernel/extable.c:150 [inline] kernel_text_address+0xbd/0xf0 kernel/extable.c:120 __kernel_text_address+0x9/0x30 kernel/extable.c:105 unwind_get_return_address arch/x86/kernel/unwind_orc.c:252 [inline] unwind_get_return_address+0x51/0x90 arch/x86/kernel/unwind_orc.c:247 __save_stack_trace+0xa0/0x160 arch/x86/kernel/stacktrace.c:45 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 kmem_cache_alloc+0x124/0x3c0 mm/slab.c:3552 kmem_cache_zalloc include/linux/slab.h:651 [inline] __kernfs_new_node+0x6f/0x470 fs/kernfs/dir.c:632 kernfs_new_node+0x7b/0xe0 fs/kernfs/dir.c:677 __kernfs_create_file+0x3d/0x320 fs/kernfs/file.c:989 sysfs_add_file_mode_ns+0x1e1/0x450 fs/sysfs/file.c:308 create_files fs/sysfs/group.c:64 [inline] internal_create_group+0x22b/0x710 fs/sysfs/group.c:134 sysfs_create_group fs/sysfs/group.c:156 [inline] sysfs_create_groups fs/sysfs/group.c:183 [inline] sysfs_create_groups+0x92/0x130 fs/sysfs/group.c:173 device_add_groups drivers/base/core.c:1064 [inline] device_add_attrs drivers/base/core.c:1223 [inline] device_add+0x879/0x15c0 drivers/base/core.c:1901 netdev_register_kobject+0x181/0x410 net/core/net-sysfs.c:1627 register_netdevice+0x955/0xe40 net/core/dev.c:7660 register_netdev+0x17/0x30 net/core/dev.c:7805 br_add_bridge+0x97/0xe0 net/bridge/br_if.c:392 br_ioctl_deviceless_stub+0x561/0x5f0 net/bridge/br_ioctl.c:378 sock_ioctl+0x254/0x4c0 net/socket.c:1038 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x466459 RSP: 002b:00007f214bb8f188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000466459 RDX: 0000000020000000 RSI: 00000000000089a0 RDI: 0000000000000005 RBP: 00000000004bf9fb R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007ffc8caa87cf R14: 00007f214bb8f300 R15: 0000000000022000 Allocated by task 11696: 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:3295 __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 11686: 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+0x5e3/0x760 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:3124 __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 ffff8880a42f22c0 which belongs to the cache kmalloc-2048 of size 2048 The buggy address is located 2024 bytes inside of 2048-byte region [ffff8880a42f22c0, ffff8880a42f2ac0) The buggy address belongs to the page: page:ffffea000290bc80 count:1 mapcount:0 mapping:ffff8880a42f22c0 index:0x0 compound_mapcount: 0 flags: 0xfff00000008100(slab|head) raw: 00fff00000008100 ffff8880a42f22c0 0000000000000000 0000000100000003 raw: ffffea00028d4120 ffffea0002ce6a20 ffff88813fe80c40 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a42f2980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880a42f2a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880a42f2a80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ^ ffff8880a42f2b00: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ffff8880a42f2b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================