netlink: 7 bytes leftover after parsing attributes in process `syz-executor5'. dev_remove_pack: ffff8801ceb23640 not found ================================================================== 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 ffff8801ca8c91c0 by task syz-executor4/3046 CPU: 0 PID: 3046 Comm: syz-executor4 Not tainted 4.14.0-rc1+ #44 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 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+0xcc5/0x51f0 drivers/net/virtio_net.c:841 virtnet_receive drivers/net/virtio_net.c:1087 [inline] virtnet_poll+0x304/0xad0 drivers/net/virtio_net.c:1168 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_acquire+0x256/0x580 kernel/locking/lockdep.c:4005 RSP: 0018:ffff8801a9c06a50 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff6e RAX: dffffc0000000000 RBX: ffff8801aa3fa2c0 RCX: 0000000000000000 RDX: 1ffffffff0b59335 RSI: ffffffff813f8afa RDI: 0000000000000282 RBP: ffff8801a9c06b48 R08: ffff8801a9c064c8 R09: ffff8801a9c064c0 R10: ffff8801a9c06438 R11: 1ffff1003547f6eb R12: 1ffff10035380d50 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000001 fs_reclaim_acquire.part.85+0x24/0x30 mm/page_alloc.c:3557 fs_reclaim_acquire+0x14/0x20 mm/page_alloc.c:3558 slab_pre_alloc_hook mm/slab.h:417 [inline] slab_alloc mm/slab.c:3383 [inline] kmem_cache_alloc+0x29/0x760 mm/slab.c:3559 ptlock_alloc mm/memory.c:4659 [inline] ptlock_init include/linux/mm.h:1729 [inline] pgtable_pmd_page_ctor include/linux/mm.h:1821 [inline] pmd_alloc_one arch/x86/include/asm/pgalloc.h:93 [inline] __pmd_alloc+0xb6/0x4e0 mm/memory.c:4150 pmd_alloc include/linux/mm.h:1679 [inline] copy_pmd_range mm/memory.c:1128 [inline] copy_pud_range mm/memory.c:1182 [inline] copy_p4d_range mm/memory.c:1204 [inline] copy_page_range+0x1679/0x27b0 mm/memory.c:1266 dup_mmap kernel/fork.c:711 [inline] dup_mm kernel/fork.c:1179 [inline] copy_mm+0xd68/0x1310 kernel/fork.c:1233 copy_process.part.36+0x1eae/0x4af0 kernel/fork.c:1735 copy_process kernel/fork.c:1548 [inline] _do_fork+0x1ef/0xfe0 kernel/fork.c:2027 SYSC_clone kernel/fork.c:2137 [inline] SyS_clone+0x37/0x50 kernel/fork.c:2131 do_syscall_64+0x26c/0x8c0 arch/x86/entry/common.c:287 entry_SYSCALL64_slow_path+0x25/0x25 RIP: 0033:0x45060a RSP: 002b:0000000000a6f9b0 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 0000000000a6f9b0 RCX: 000000000045060a RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011 RBP: 0000000000a6f9f0 R08: 0000000000000001 R09: 00000000018ae940 R10: 00000000018aec10 R11: 0000000000000246 R12: 0000000000000001 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000016 Allocated by task 9617: 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 9644: 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 ffff8801ca8c8940 which belongs to the cache kmalloc-4096 of size 4096 The buggy address is located 2176 bytes inside of 4096-byte region [ffff8801ca8c8940, ffff8801ca8c9940) The buggy address belongs to the page: page:ffffea00072a3200 count:1 mapcount:0 mapping:ffff8801ca8c8940 index:0x0 compound_mapcount: 0 flags: 0x200000000008100(slab|head) raw: 0200000000008100 ffff8801ca8c8940 0000000000000000 0000000100000001 raw: ffffea00072e3b20 ffffea0006fd1f20 ffff8801dac00dc0 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801ca8c9080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801ca8c9100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8801ca8c9180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8801ca8c9200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801ca8c9280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================