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BUG: KASAN: slab-out-of-bounds in memcpy include/linux/fortify-string.h:191 [inline]
BUG: KASAN: slab-out-of-bounds in skb_copy_from_linear_data_offset include/linux/skbuff.h:3676 [inline]
BUG: KASAN: slab-out-of-bounds in skb_segment+0x14ba/0x37a0 net/core/skbuff.c:4000
Read of size 1428 at addr ffff888018c246d4 by task syz-executor.3/14738

CPU: 0 PID: 14738 Comm: syz-executor.3 Not tainted 5.11.0-rc4-next-20210119-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:397 [inline]
 kasan_report.cold+0x79/0xd5 mm/kasan/report.c:414
 check_region_inline mm/kasan/generic.c:180 [inline]
 kasan_check_range+0x13d/0x180 mm/kasan/generic.c:186
 memcpy+0x20/0x60 mm/kasan/shadow.c:65
 memcpy include/linux/fortify-string.h:191 [inline]
 skb_copy_from_linear_data_offset include/linux/skbuff.h:3676 [inline]
 skb_segment+0x14ba/0x37a0 net/core/skbuff.c:4000
 tcp_gso_segment+0x33d/0x17e0 net/ipv4/tcp_offload.c:98
 tcp4_gso_segment net/ipv4/tcp_offload.c:51 [inline]
 tcp4_gso_segment+0x194/0x3a0 net/ipv4/tcp_offload.c:29
 inet_gso_segment+0x502/0x1110 net/ipv4/af_inet.c:1378
 ipip_gso_segment+0xbe/0xf0 net/ipv4/af_inet.c:1430
 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
 neigh_hh_output include/net/neighbour.h:499 [inline]
 neigh_output include/net/neighbour.h:508 [inline]
 ip_finish_output2+0xeb6/0x21b0 net/ipv4/ip_output.c:230
 __ip_finish_output net/ipv4/ip_output.c:308 [inline]
 __ip_finish_output+0x396/0x640 net/ipv4/ip_output.c:290
 ip_finish_output+0x35/0x200 net/ipv4/ip_output.c:318
 NF_HOOK_COND include/linux/netfilter.h:290 [inline]
 ip_output+0x196/0x310 net/ipv4/ip_output.c:432
 dst_output include/net/dst.h:441 [inline]
 ip_local_out+0xaf/0x1a0 net/ipv4/ip_output.c:126
 iptunnel_xmit+0x5a3/0x9c0 net/ipv4/ip_tunnel_core.c:82
 ip_tunnel_xmit+0x1116/0x2b00 net/ipv4/ip_tunnel.c:806
 sit_tunnel_xmit__ net/ipv6/sit.c:1060 [inline]
 sit_tunnel_xmit+0x4fd/0x2a80 net/ipv6/sit.c:1076
 __netdev_start_xmit include/linux/netdevice.h:4758 [inline]
 netdev_start_xmit include/linux/netdevice.h:4772 [inline]
 xmit_one net/core/dev.c:3574 [inline]
 dev_hard_start_xmit+0x1eb/0x920 net/core/dev.c:3590
 __dev_queue_xmit+0x21db/0x2dd0 net/core/dev.c:4151
 neigh_connected_output+0x380/0x4c0 net/core/neighbour.c:1519
 neigh_output include/net/neighbour.h:510 [inline]
 ip_finish_output2+0x83d/0x21b0 net/ipv4/ip_output.c:230
 __ip_finish_output net/ipv4/ip_output.c:308 [inline]
 __ip_finish_output+0x396/0x640 net/ipv4/ip_output.c:290
 ip_finish_output+0x35/0x200 net/ipv4/ip_output.c:318
 NF_HOOK_COND include/linux/netfilter.h:290 [inline]
 ip_output+0x196/0x310 net/ipv4/ip_output.c:432
 dst_output include/net/dst.h:441 [inline]
 ip_local_out net/ipv4/ip_output.c:126 [inline]
 __ip_queue_xmit+0x8e9/0x1a00 net/ipv4/ip_output.c:532
 __tcp_transmit_skb+0x188c/0x38f0 net/ipv4/tcp_output.c:1405
 tcp_transmit_skb net/ipv4/tcp_output.c:1423 [inline]
 tcp_write_xmit+0xde7/0x6140 net/ipv4/tcp_output.c:2689
 tcp_sendmsg_locked+0xa1c/0x2e40 net/ipv4/tcp.c:1410
 tcp_sendmsg+0x2b/0x40 net/ipv4/tcp.c:1459
 inet_sendmsg+0x99/0xe0 net/ipv4/af_inet.c:817
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:672
 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2345
 ___sys_sendmsg+0xf3/0x170 net/socket.c:2399
 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2432
 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:00007f1faa2b9c68 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045e219
RDX: 0000000000006d70 RSI: 0000000020001400 RDI: 000000000000000b
RBP: 000000000119bfc0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119bf8c
R13: 00007ffc4275f4bf R14: 00007f1faa2ba9c0 R15: 000000000119bf8c

Allocated by task 14738:
 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:403 [inline]
 ____kasan_kmalloc mm/kasan/common.c:434 [inline]
 ____kasan_kmalloc.constprop.0+0xa0/0xd0 mm/kasan/common.c:406
 kasan_slab_alloc include/linux/kasan.h:209 [inline]
 slab_post_alloc_hook mm/slab.h:518 [inline]
 slab_alloc_node mm/slub.c:2903 [inline]
 __kmalloc_node_track_caller+0x191/0x320 mm/slub.c:4569
 __kmalloc_reserve net/core/skbuff.c:142 [inline]
 __alloc_skb+0xae/0x5a0 net/core/skbuff.c:210
 alloc_skb_fclone include/linux/skbuff.h:1150 [inline]
 sk_stream_alloc_skb+0x109/0xc30 net/ipv4/tcp.c:888
 tcp_sendmsg_locked+0xc00/0x2e40 net/ipv4/tcp.c:1310
 tcp_sendmsg+0x2b/0x40 net/ipv4/tcp.c:1459
 inet_sendmsg+0x99/0xe0 net/ipv4/af_inet.c:817
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:672
 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2345
 ___sys_sendmsg+0xf3/0x170 net/socket.c:2399
 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2432
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Last potentially related work creation:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
 kasan_record_aux_stack+0xe5/0x110 mm/kasan/generic.c:345
 __call_rcu kernel/rcu/tree.c:3011 [inline]
 call_rcu+0xbb/0x750 kernel/rcu/tree.c:3086
 pwq_unbound_release_workfn+0x23a/0x2d0 kernel/workqueue.c:3700
 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 ffff888018c24000
 which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 724 bytes to the right of
 1024-byte region [ffff888018c24000, ffff888018c24400)
The buggy address belongs to the page:
page:000000007dfa5dbc refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x18c24
head:000000007dfa5dbc order:2 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head)
raw: 00fff00000010200 dead000000000100 dead000000000122 ffff888010041140
raw: 0000000000000000 0000000000080008 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff888018c24580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888018c24600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888018c24680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                                                 ^
 ffff888018c24700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888018c24780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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