================================================================== BUG: KASAN: use-after-free in eth_header_parse_protocol+0xad/0xd0 net/ethernet/eth.c:282 Read of size 2 at addr ffff8881e398180b by task syz-executor.3/7487 CPU: 0 PID: 7487 Comm: syz-executor.3 Not tainted 5.4.111-syzkaller-00138-g3c5dbcf40ba8 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1d8/0x24e lib/dump_stack.c:118 print_address_description+0x9b/0x650 mm/kasan/report.c:384 __kasan_report+0x182/0x260 mm/kasan/report.c:516 kasan_report+0x30/0x60 mm/kasan/common.c:641 eth_header_parse_protocol+0xad/0xd0 net/ethernet/eth.c:282 dev_parse_header_protocol include/linux/netdevice.h:3016 [inline] virtio_net_hdr_to_skb+0x6de/0xd70 include/linux/virtio_net.h:83 packet_snd net/packet/af_packet.c:2976 [inline] packet_sendmsg+0x483a/0x6780 net/packet/af_packet.c:3013 sock_sendmsg_nosec net/socket.c:638 [inline] sock_sendmsg net/socket.c:658 [inline] sock_write_iter+0x330/0x450 net/socket.c:990 call_write_iter include/linux/fs.h:1971 [inline] new_sync_write fs/read_write.c:483 [inline] __vfs_write+0x5ec/0x780 fs/read_write.c:496 vfs_write+0x212/0x4e0 fs/read_write.c:558 ksys_write+0x186/0x2b0 fs/read_write.c:611 do_syscall_64+0xcb/0x1e0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x466459 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f4cc40fd188 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000466459 RDX: 0000000000000122 RSI: 0000000020000740 RDI: 0000000000000003 RBP: 00000000004bf9fb R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007ffeffd8bbef R14: 00007f4cc40fd300 R15: 0000000000022000 Allocated by task 149: save_stack mm/kasan/common.c:70 [inline] set_track mm/kasan/common.c:78 [inline] __kasan_kmalloc+0x137/0x1e0 mm/kasan/common.c:517 slab_post_alloc_hook mm/slab.h:584 [inline] slab_alloc_node mm/slub.c:2821 [inline] slab_alloc mm/slub.c:2829 [inline] __kmalloc_track_caller+0x13a/0x2e0 mm/slub.c:4439 __kmalloc_reserve net/core/skbuff.c:142 [inline] __alloc_skb+0xaf/0x4d0 net/core/skbuff.c:210 alloc_skb include/linux/skbuff.h:1057 [inline] nlmsg_new include/net/netlink.h:888 [inline] rtmsg_ifa+0x1f1/0x3b0 net/ipv4/devinet.c:1900 __inet_del_ifa+0x7df/0xdf0 net/ipv4/devinet.c:427 inet_del_ifa net/ipv4/devinet.c:465 [inline] inetdev_destroy net/ipv4/devinet.c:318 [inline] inetdev_event+0x647/0x1100 net/ipv4/devinet.c:1599 notifier_call_chain kernel/notifier.c:98 [inline] __raw_notifier_call_chain kernel/notifier.c:399 [inline] raw_notifier_call_chain+0x9e/0x110 kernel/notifier.c:406 call_netdevice_notifiers_info net/core/dev.c:1670 [inline] call_netdevice_notifiers_extack net/core/dev.c:1682 [inline] call_netdevice_notifiers net/core/dev.c:1696 [inline] rollback_registered_many+0xd26/0x1390 net/core/dev.c:8579 unregister_netdevice_many net/core/dev.c:9736 [inline] default_device_exit_batch+0x481/0x770 net/core/dev.c:10207 ops_exit_list net/core/net_namespace.c:175 [inline] cleanup_net+0x76c/0xd20 net/core/net_namespace.c:597 process_one_work+0x679/0x1030 kernel/workqueue.c:2277 worker_thread+0xa6f/0x1400 kernel/workqueue.c:2423 kthread+0x30f/0x330 kernel/kthread.c:268 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352 Freed by task 149: save_stack mm/kasan/common.c:70 [inline] set_track mm/kasan/common.c:78 [inline] kasan_set_free_info mm/kasan/common.c:333 [inline] __kasan_slab_free+0x18a/0x240 mm/kasan/common.c:475 slab_free_hook mm/slub.c:1454 [inline] slab_free_freelist_hook+0x7b/0x150 mm/slub.c:1492 slab_free mm/slub.c:3072 [inline] kfree+0xe0/0x660 mm/slub.c:4061 skb_release_all net/core/skbuff.c:675 [inline] __kfree_skb+0x55/0x170 net/core/skbuff.c:689 netlink_broadcast_filtered+0xf85/0x10a0 net/netlink/af_netlink.c:1513 netlink_broadcast net/netlink/af_netlink.c:1535 [inline] nlmsg_multicast include/net/netlink.h:968 [inline] nlmsg_notify+0xa2/0x140 net/netlink/af_netlink.c:2521 rtmsg_ifa+0x23e/0x3b0 net/ipv4/devinet.c:1911 __inet_del_ifa+0x7df/0xdf0 net/ipv4/devinet.c:427 inet_del_ifa net/ipv4/devinet.c:465 [inline] inetdev_destroy net/ipv4/devinet.c:318 [inline] inetdev_event+0x647/0x1100 net/ipv4/devinet.c:1599 notifier_call_chain kernel/notifier.c:98 [inline] __raw_notifier_call_chain kernel/notifier.c:399 [inline] raw_notifier_call_chain+0x9e/0x110 kernel/notifier.c:406 call_netdevice_notifiers_info net/core/dev.c:1670 [inline] call_netdevice_notifiers_extack net/core/dev.c:1682 [inline] call_netdevice_notifiers net/core/dev.c:1696 [inline] rollback_registered_many+0xd26/0x1390 net/core/dev.c:8579 unregister_netdevice_many net/core/dev.c:9736 [inline] default_device_exit_batch+0x481/0x770 net/core/dev.c:10207 ops_exit_list net/core/net_namespace.c:175 [inline] cleanup_net+0x76c/0xd20 net/core/net_namespace.c:597 process_one_work+0x679/0x1030 kernel/workqueue.c:2277 worker_thread+0xa6f/0x1400 kernel/workqueue.c:2423 kthread+0x30f/0x330 kernel/kthread.c:268 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352 The buggy address belongs to the object at ffff8881e3981800 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 11 bytes inside of 512-byte region [ffff8881e3981800, ffff8881e3981a00) The buggy address belongs to the page: page:ffffea00078e6000 refcount:1 mapcount:0 mapping:ffff8881f5c02500 index:0x0 compound_mapcount: 0 flags: 0x8000000000010200(slab|head) raw: 8000000000010200 dead000000000100 dead000000000122 ffff8881f5c02500 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8881e3981700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8881e3981780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8881e3981800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8881e3981880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881e3981900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================