================================================================== BUG: KASAN: use-after-free in memcpy include/linux/string.h:447 [inline] BUG: KASAN: use-after-free in skb_copy_from_linear_data_offset include/linux/skbuff.h:3676 [inline] BUG: KASAN: use-after-free in skb_segment+0x14ba/0x37a0 net/core/skbuff.c:3996 Read of size 2324 at addr ffff888012c2b2f7 by task syz-executor.3/18593 CPU: 0 PID: 18593 Comm: syz-executor.3 Not tainted 5.11.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x107/0x163 lib/dump_stack.c:120 print_address_description.constprop.0.cold+0x5b/0x2f8 mm/kasan/report.c:230 __kasan_report mm/kasan/report.c:396 [inline] kasan_report.cold+0x79/0xd5 mm/kasan/report.c:413 check_memory_region_inline mm/kasan/generic.c:179 [inline] check_memory_region+0x13d/0x180 mm/kasan/generic.c:185 memcpy+0x20/0x60 mm/kasan/shadow.c:64 memcpy include/linux/string.h:447 [inline] skb_copy_from_linear_data_offset include/linux/skbuff.h:3676 [inline] skb_segment+0x14ba/0x37a0 net/core/skbuff.c:3996 udp4_ufo_fragment+0x4ae/0x700 net/ipv4/udp_offload.c:363 inet_gso_segment+0x502/0x1110 net/ipv4/af_inet.c:1378 skb_mac_gso_segment+0x26e/0x530 net/core/dev.c:3326 __skb_gso_segment+0x330/0x6e0 net/core/dev.c:3399 skb_gso_segment include/linux/netdevice.h:4708 [inline] validate_xmit_skb+0x69e/0xee0 net/core/dev.c:3644 __dev_queue_xmit+0x988/0x2dd0 net/core/dev.c:4142 packet_snd net/packet/af_packet.c:3006 [inline] packet_sendmsg+0x2406/0x52a0 net/packet/af_packet.c:3031 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:672 __sys_sendto+0x21c/0x320 net/socket.c:1975 __do_sys_sendto net/socket.c:1987 [inline] __se_sys_sendto net/socket.c:1983 [inline] __x64_sys_sendto+0xdd/0x1b0 net/socket.c:1983 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45e219 Code: 0d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f3140b17c68 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 000000000045e219 RDX: 000000000000fc13 RSI: 0000000020000280 RDI: 0000000000000003 RBP: 000000000119c080 R08: 0000000000000000 R09: 000000000000002f R10: 0000000000000800 R11: 0000000000000246 R12: 000000000119c034 R13: 00007fffd23b2b2f R14: 00007f3140b189c0 R15: 000000000119c034 Allocated by task 8484: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:401 [inline] ____kasan_kmalloc.constprop.0+0x82/0xa0 mm/kasan/common.c:429 kasan_slab_alloc include/linux/kasan.h:205 [inline] slab_post_alloc_hook mm/slab.h:512 [inline] slab_alloc_node mm/slub.c:2891 [inline] slab_alloc mm/slub.c:2899 [inline] kmem_cache_alloc+0x1c6/0x440 mm/slub.c:2904 kmem_cache_zalloc include/linux/slab.h:672 [inline] __kernfs_new_node+0xd4/0x8b0 fs/kernfs/dir.c:626 kernfs_new_node+0x93/0x120 fs/kernfs/dir.c:688 __kernfs_create_file+0x51/0x350 fs/kernfs/file.c:1002 sysfs_add_file_mode_ns+0x226/0x540 fs/sysfs/file.c:306 create_files fs/sysfs/group.c:64 [inline] internal_create_group+0x328/0xb20 fs/sysfs/group.c:149 internal_create_groups.part.0+0x90/0x140 fs/sysfs/group.c:189 internal_create_groups fs/sysfs/group.c:185 [inline] sysfs_create_groups+0x25/0x50 fs/sysfs/group.c:215 device_add_groups drivers/base/core.c:2186 [inline] device_add_attrs drivers/base/core.c:2334 [inline] device_add+0x824/0x1d90 drivers/base/core.c:3042 netdev_register_kobject+0x181/0x430 net/core/net-sysfs.c:1939 register_netdevice+0xd67/0x1760 net/core/dev.c:10037 ipvlan_link_new+0x3a4/0xc10 drivers/net/ipvlan/ipvlan_main.c:586 __rtnl_newlink+0x108b/0x16e0 net/core/rtnetlink.c:3443 rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3491 rtnetlink_rcv_msg+0x44e/0xad0 net/core/rtnetlink.c:5553 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2494 netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1330 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:672 __sys_sendto+0x21c/0x320 net/socket.c:1975 __do_sys_sendto net/socket.c:1987 [inline] __se_sys_sendto net/socket.c:1983 [inline] __x64_sys_sendto+0xdd/0x1b0 net/socket.c:1983 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Freed by task 24: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track+0x1c/0x30 mm/kasan/common.c:46 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:356 ____kasan_slab_free+0xe1/0x110 mm/kasan/common.c:362 kasan_slab_free include/linux/kasan.h:188 [inline] slab_free_hook mm/slub.c:1547 [inline] slab_free_freelist_hook+0x5d/0x150 mm/slub.c:1580 slab_free mm/slub.c:3142 [inline] kmem_cache_free+0x82/0x350 mm/slub.c:3158 kernfs_put.part.0+0x2c4/0x540 fs/kernfs/dir.c:537 kernfs_put+0x42/0x50 fs/kernfs/dir.c:511 __kernfs_remove+0x6fe/0xa90 fs/kernfs/dir.c:1343 kernfs_remove_by_name_ns+0x51/0xb0 fs/kernfs/dir.c:1515 kernfs_remove_by_name include/linux/kernfs.h:593 [inline] remove_files+0x96/0x1c0 fs/sysfs/group.c:28 sysfs_remove_group+0x87/0x170 fs/sysfs/group.c:289 sysfs_remove_groups fs/sysfs/group.c:313 [inline] sysfs_remove_groups+0x5c/0xa0 fs/sysfs/group.c:305 device_remove_groups drivers/base/core.c:2193 [inline] device_remove_attrs+0x123/0x160 drivers/base/core.c:2390 device_del+0x4fa/0xd40 drivers/base/core.c:3269 rollback_registered_many+0xcd4/0x14c0 net/core/dev.c:9507 unregister_netdevice_many.part.0+0x1a/0x2f0 net/core/dev.c:10715 unregister_netdevice_many net/core/dev.c:10714 [inline] default_device_exit_batch+0x30c/0x3d0 net/core/dev.c:11198 ops_exit_list+0x10d/0x160 net/core/net_namespace.c:190 cleanup_net+0x4ea/0xb10 net/core/net_namespace.c:604 process_one_work+0x98d/0x15f0 kernel/workqueue.c:2275 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 The buggy address belongs to the object at ffff888012c2b2b8 which belongs to the cache kernfs_node_cache of size 168 The buggy address is located 63 bytes inside of 168-byte region [ffff888012c2b2b8, ffff888012c2b360) The buggy address belongs to the page: page:00000000b8be2dd5 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x12c2b flags: 0xfff00000000200(slab) raw: 00fff00000000200 dead000000000100 dead000000000122 ffff8880101be780 raw: 0000000000000000 0000000000110011 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888012c2b180: fb fb fc fc fc fc fc fc fc fc fa fb fb fb fb fb ffff888012c2b200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc >ffff888012c2b280: fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb fb ^ ffff888012c2b300: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ffff888012c2b380: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb fb ==================================================================