================================================================== BUG: KASAN: use-after-free in __read_once_size include/linux/compiler.h:183 [inline] BUG: KASAN: use-after-free in dev_queue_xmit_nit+0x7cb/0x940 net/core/dev.c:1929 Read of size 8 at addr ffff8880653879e8 by task syz-executor.2/16913 CPU: 0 PID: 16913 Comm: syz-executor.2 Not tainted 4.14.148 #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+0x138/0x197 lib/dump_stack.c:53 print_address_description.cold+0x7c/0x1dc mm/kasan/report.c:252 kasan_report_error mm/kasan/report.c:351 [inline] kasan_report mm/kasan/report.c:409 [inline] kasan_report.cold+0xa9/0x2af mm/kasan/report.c:393 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:430 __read_once_size include/linux/compiler.h:183 [inline] dev_queue_xmit_nit+0x7cb/0x940 net/core/dev.c:1929 xmit_one net/core/dev.c:3005 [inline] dev_hard_start_xmit+0xa7/0x8b0 net/core/dev.c:3025 sch_direct_xmit+0x27a/0x550 net/sched/sch_generic.c:186 __dev_xmit_skb net/core/dev.c:3218 [inline] __dev_queue_xmit+0x1b6e/0x25e0 net/core/dev.c:3493 dev_queue_xmit+0x18/0x20 net/core/dev.c:3558 neigh_hh_output include/net/neighbour.h:490 [inline] neigh_output include/net/neighbour.h:498 [inline] ip6_finish_output2+0x10bd/0x21b0 net/ipv6/ip6_output.c:120 ip6_finish_output+0x4f4/0xb50 net/ipv6/ip6_output.c:154 NF_HOOK_COND include/linux/netfilter.h:239 [inline] ip6_output+0x20f/0x6d0 net/ipv6/ip6_output.c:171 dst_output include/net/dst.h:462 [inline] NF_HOOK include/linux/netfilter.h:250 [inline] NF_HOOK include/linux/netfilter.h:244 [inline] mld_sendpack+0x8d1/0xd60 net/ipv6/mcast.c:1660 mld_send_cr net/ipv6/mcast.c:1956 [inline] mld_ifc_timer_expire+0x3b6/0x7b0 net/ipv6/mcast.c:2455 call_timer_fn+0x161/0x670 kernel/time/timer.c:1279 expire_timers kernel/time/timer.c:1318 [inline] __run_timers kernel/time/timer.c:1634 [inline] __run_timers kernel/time/timer.c:1602 [inline] run_timer_softirq+0x5b4/0x1570 kernel/time/timer.c:1647 __do_softirq+0x244/0x9a0 kernel/softirq.c:288 invoke_softirq kernel/softirq.c:368 [inline] irq_exit+0x160/0x1b0 kernel/softirq.c:409 exiting_irq arch/x86/include/asm/apic.h:648 [inline] smp_apic_timer_interrupt+0x146/0x5e0 arch/x86/kernel/apic/apic.c:1102 apic_timer_interrupt+0x96/0xa0 arch/x86/entry/entry_64.S:792 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+0x95/0xe0 kernel/locking/spinlock.c:192 RSP: 0018:ffff8880a5c36ec8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff10 RAX: 1ffffffff0ee2a81 RBX: 0000000000000286 RCX: 1ffff1100cb755bc RDX: dffffc0000000000 RSI: ffff888065baade8 RDI: 0000000000000286 RBP: ffff8880a5c36ed8 R08: ffff888065baa540 R09: ffff888065baade0 R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff87792ea0 R13: 0000000000000286 R14: ffffffff87791b10 R15: dffffc0000000000 swake_up+0x4d/0x60 kernel/sched/swait.c:39 __rcu_report_exp_rnp+0x1d8/0x270 kernel/rcu/tree_exp.h:185 rcu_report_exp_rnp kernel/rcu/tree_exp.h:210 [inline] rcu_read_unlock_special+0x660/0xd40 kernel/rcu/tree_plugin.h:540 __rcu_read_unlock+0x161/0x170 kernel/rcu/update.c:260 rcu_read_unlock include/linux/rcupdate.h:684 [inline] net_generic include/net/netns/generic.h:47 [inline] caif_device_list net/caif/caif_dev.c:69 [inline] caif_device_notify+0x2c8/0xfd3 net/caif/caif_dev.c:369 notifier_call_chain+0x111/0x1b0 kernel/notifier.c:93 __raw_notifier_call_chain kernel/notifier.c:394 [inline] raw_notifier_call_chain+0x2e/0x40 kernel/notifier.c:401 call_netdevice_notifiers_info+0x56/0x70 net/core/dev.c:1671 netdev_state_change net/core/dev.c:1318 [inline] netdev_state_change+0xbf/0xe0 net/core/dev.c:1312 do_setlink+0x2415/0x2d50 net/core/rtnetlink.c:2259 rtnl_group_changelink net/core/rtnetlink.c:2482 [inline] rtnl_newlink+0xbe4/0x1700 net/core/rtnetlink.c:2636 rtnetlink_rcv_msg+0x3eb/0xb70 net/core/rtnetlink.c:4285 netlink_rcv_skb+0x14f/0x3c0 net/netlink/af_netlink.c:2432 rtnetlink_rcv+0x1d/0x30 net/core/rtnetlink.c:4297 netlink_unicast_kernel net/netlink/af_netlink.c:1286 [inline] netlink_unicast+0x45d/0x640 net/netlink/af_netlink.c:1312 netlink_sendmsg+0x7c4/0xc60 net/netlink/af_netlink.c:1877 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg+0xce/0x110 net/socket.c:656 ___sys_sendmsg+0x70a/0x840 net/socket.c:2062 __sys_sendmsg+0xb9/0x140 net/socket.c:2096 SYSC_sendmsg net/socket.c:2107 [inline] SyS_sendmsg+0x2d/0x50 net/socket.c:2103 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x459a59 RSP: 002b:00007f628d4f6c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459a59 RDX: 000000000400c094 RSI: 0000000020000140 RDI: 0000000000000004 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f628d4f76d4 R13: 00000000004c7bd7 R14: 00000000004dd968 R15: 00000000ffffffff Allocated by task 16912: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59 save_stack+0x45/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc mm/kasan/kasan.c:551 [inline] kasan_kmalloc+0xce/0xf0 mm/kasan/kasan.c:529 __do_kmalloc mm/slab.c:3720 [inline] __kmalloc+0x15d/0x7a0 mm/slab.c:3729 kmalloc include/linux/slab.h:493 [inline] sk_prot_alloc+0x171/0x2a0 net/core/sock.c:1467 sk_alloc+0x39/0xd70 net/core/sock.c:1521 packet_create+0xfa/0x820 net/packet/af_packet.c:3264 __sock_create+0x2f6/0x620 net/socket.c:1275 sock_create net/socket.c:1315 [inline] SYSC_socket net/socket.c:1345 [inline] SyS_socket+0xd3/0x170 net/socket.c:1325 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 Freed by task 16907: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59 save_stack+0x45/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_slab_free+0x75/0xc0 mm/kasan/kasan.c:524 __cache_free mm/slab.c:3496 [inline] kfree+0xcc/0x270 mm/slab.c:3815 sk_prot_free net/core/sock.c:1504 [inline] __sk_destruct+0x450/0x580 net/core/sock.c:1581 sk_destruct+0xa4/0xd0 net/core/sock.c:1596 __sk_free+0x54/0x230 net/core/sock.c:1604 sk_free+0x35/0x40 net/core/sock.c:1615 sock_put include/net/sock.h:1653 [inline] packet_release+0x8ba/0xb50 net/packet/af_packet.c:3093 __sock_release+0xce/0x2b0 net/socket.c:602 sock_close+0x1b/0x30 net/socket.c:1139 __fput+0x275/0x7a0 fs/file_table.c:210 ____fput+0x16/0x20 fs/file_table.c:244 task_work_run+0x114/0x190 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:191 [inline] exit_to_usermode_loop+0x1da/0x220 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+0x4bc/0x640 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x42/0xb7 The buggy address belongs to the object at ffff888065387200 which belongs to the cache kmalloc-2048 of size 2048 The buggy address is located 2024 bytes inside of 2048-byte region [ffff888065387200, ffff888065387a00) The buggy address belongs to the page: page:ffffea000194e180 count:1 mapcount:0 mapping:ffff888065386100 index:0x0 compound_mapcount: 0 flags: 0x1fffc0000008100(slab|head) raw: 01fffc0000008100 ffff888065386100 0000000000000000 0000000100000003 raw: ffffea00019410a0 ffffea000181d3a0 ffff8880aa800c40 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888065387880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888065387900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888065387980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888065387a00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888065387a80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================