================================================================== BUG: KASAN: use-after-free in deliver_ptype_list_skb net/core/dev.c:1871 [inline] BUG: KASAN: use-after-free in __netif_receive_skb_core+0x2be3/0x33d0 net/core/dev.c:4406 Read of size 2 at addr ffff8801ca8a8dc0 by task syz-executor2/23548 CPU: 0 PID: 23548 Comm: syz-executor2 Not tainted 4.14.0-rc1+ #52 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 selinux_nlmsg_perm: 13 callbacks suppressed SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=23560 comm=syz-executor5 Call Trace: __dump_stack lib/dump_stack.c:16 [inline] dump_stack+0x194/0x257 lib/dump_stack.c:52 print_address_description+0x73/0x250 mm/kasan/report.c:252 kasan_report_error mm/kasan/report.c:351 [inline] kasan_report+0x24e/0x340 mm/kasan/report.c:409 __asan_report_load2_noabort+0x14/0x20 mm/kasan/report.c:428 deliver_ptype_list_skb net/core/dev.c:1871 [inline] __netif_receive_skb_core+0x2be3/0x33d0 net/core/dev.c:4406 __netif_receive_skb+0x2c/0x1b0 net/core/dev.c:4461 netif_receive_skb_internal+0x10b/0x670 net/core/dev.c:4534 napi_skb_finish net/core/dev.c:4895 [inline] napi_gro_receive+0x3d0/0x500 net/core/dev.c:4926 receive_buf+0x792/0x5320 drivers/net/virtio_net.c:881 virtnet_receive drivers/net/virtio_net.c:1127 [inline] virtnet_poll+0x359/0xbc0 drivers/net/virtio_net.c:1209 napi_poll net/core/dev.c:5537 [inline] net_rx_action+0x792/0x1910 net/core/dev.c:5603 __do_softirq+0x2bb/0xbd0 kernel/softirq.c:284 invoke_softirq kernel/softirq.c:364 [inline] irq_exit+0x1d3/0x210 kernel/softirq.c:405 exiting_irq arch/x86/include/asm/apic.h:638 [inline] do_IRQ+0xf6/0x190 arch/x86/kernel/irq.c:253 common_interrupt+0x9d/0x9d arch/x86/entry/entry_64.S:598 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:777 [inline] RIP: 0010:lock_is_held_type+0x18b/0x210 kernel/locking/lockdep.c:4042 RSP: 0018:ffff8801c396f2c0 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff6e RAX: dffffc0000000000 RBX: 0000000000000282 RCX: 0000000000000000 RDX: 1ffffffff0b59335 RSI: 00000000ffffffff RDI: 0000000000000282 RBP: ffff8801c396f2e0 R08: ffffffff842a1163 R09: 0000000000000000 R10: ffff8801c396f7d0 R11: 0000000000000000 R12: ffff8801cb2f8340 R13: 0000000000000000 R14: 00000000000002eb R15: 0000000000000000 lock_is_held include/linux/lockdep.h:436 [inline] rcu_preempt_sleep_check include/linux/rcupdate.h:301 [inline] ___might_sleep+0x35e/0x470 kernel/sched/core.c:5980 __might_sleep+0x95/0x190 kernel/sched/core.c:5968 __mutex_lock_common kernel/locking/mutex.c:747 [inline] __mutex_lock+0x13e/0x1870 kernel/locking/mutex.c:893 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908 unix_dgram_recvmsg+0x373/0x1990 net/unix/af_unix.c:2104 sock_recvmsg_nosec net/socket.c:806 [inline] sock_recvmsg+0xc9/0x110 net/socket.c:813 SYSC_recvfrom+0x2dc/0x570 net/socket.c:1802 SyS_recvfrom+0x40/0x50 net/socket.c:1774 entry_SYSCALL_64_fastpath+0x1f/0xbe RIP: 0033:0x4520a9 RSP: 002b:00007f6fceed1c08 EFLAGS: 00000216 ORIG_RAX: 000000000000002d RAX: ffffffffffffffda RBX: 0000000000718000 RCX: 00000000004520a9 RDX: 00000000000000e9 RSI: 000000002053ef17 RDI: 0000000000000018 RBP: 0000000000000082 R08: 0000000020eca000 R09: 000000000000000a R10: 0000000000000120 R11: 0000000000000216 R12: 00000000004bae37 R13: 00000000ffffffff R14: 0000000000000018 R15: 00000000200bd000 Allocated by task 23502: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59 save_stack+0x43/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:551 kmem_cache_alloc_trace+0x136/0x750 mm/slab.c:3627 kmalloc include/linux/slab.h:493 [inline] kzalloc include/linux/slab.h:666 [inline] fanout_add+0xa50/0x1190 net/packet/af_packet.c:1733 packet_setsockopt+0xfdc/0x1e80 net/packet/af_packet.c:3795 SYSC_setsockopt net/socket.c:1852 [inline] SyS_setsockopt+0x189/0x360 net/socket.c:1831 entry_SYSCALL_64_fastpath+0x1f/0xbe Freed by task 23537: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59 save_stack+0x43/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_slab_free+0x71/0xc0 mm/kasan/kasan.c:524 __cache_free mm/slab.c:3503 [inline] kfree+0xca/0x250 mm/slab.c:3820 packet_release+0xa8f/0xd70 net/packet/af_packet.c:3033 sock_release+0x8d/0x1e0 net/socket.c:597 sock_close+0x16/0x20 net/socket.c:1126 __fput+0x333/0x7f0 fs/file_table.c:210 ____fput+0x15/0x20 fs/file_table.c:244 task_work_run+0x199/0x270 kernel/task_work.c:112 exit_task_work include/linux/task_work.h:21 [inline] do_exit+0xa52/0x1b40 kernel/exit.c:865 do_group_exit+0x149/0x400 kernel/exit.c:968 get_signal+0x7e8/0x17e0 kernel/signal.c:2334 do_signal+0x94/0x1ee0 arch/x86/kernel/signal.c:808 exit_to_usermode_loop+0x224/0x300 arch/x86/entry/common.c:158 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath+0x42f/0x500 arch/x86/entry/common.c:266 entry_SYSCALL_64_fastpath+0xbc/0xbe The buggy address belongs to the object at ffff8801ca8a8540 which belongs to the cache kmalloc-4096 of size 4096 The buggy address is located 2176 bytes inside of 4096-byte region [ffff8801ca8a8540, ffff8801ca8a9540) The buggy address belongs to the page: page:ffffea00072a2a00 count:1 mapcount:0 mapping:ffff8801ca8a8540 index:0x0 compound_mapcount: 0 flags: 0x200000000008100(slab|head) raw: 0200000000008100 ffff8801ca8a8540 0000000000000000 0000000100000001 raw: ffffea00072ef5a0 ffffea000705f820 ffff8801dac00dc0 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801ca8a8c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801ca8a8d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8801ca8a8d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8801ca8a8e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801ca8a8e80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb 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