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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 32751 at addr ffff888066e5f92f by task syz-executor.1/6818

CPU: 0 PID: 6818 Comm: syz-executor.1 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
 tcp_gso_segment+0x33d/0x17e0 net/ipv4/tcp_offload.c:98
 tcp6_gso_segment net/ipv6/tcpv6_offload.c:65 [inline]
 tcp6_gso_segment+0x1a0/0x460 net/ipv6/tcpv6_offload.c:41
 ipv6_gso_segment+0x48d/0xf50 net/ipv6/ip6_offload.c:115
 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]
 ip6_finish_output_gso_slowpath_drop net/ipv6/ip6_output.c:141 [inline]
 __ip6_finish_output net/ipv6/ip6_output.c:175 [inline]
 __ip6_finish_output+0xac6/0xe10 net/ipv6/ip6_output.c:161
 ip6_finish_output+0x35/0x200 net/ipv6/ip6_output.c:192
 NF_HOOK_COND include/linux/netfilter.h:290 [inline]
 ip6_output+0x1db/0x520 net/ipv6/ip6_output.c:215
 dst_output include/net/dst.h:441 [inline]
 NF_HOOK include/linux/netfilter.h:301 [inline]
 NF_HOOK include/linux/netfilter.h:295 [inline]
 ip6_xmit+0x127e/0x1eb0 net/ipv6/ip6_output.c:319
 inet6_csk_xmit+0x358/0x630 net/ipv6/inet6_connection_sock.c:135
 __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_push_pending_frames+0xaa/0x390 net/ipv4/tcp_output.c:2869
 tcp_push+0x446/0x6c0 net/ipv4/tcp.c:737
 tcp_sendmsg_locked+0x1170/0x2e40 net/ipv4/tcp.c:1416
 tcp_sendmsg+0x2b/0x40 net/ipv4/tcp.c:1459
 inet6_sendmsg+0x99/0xe0 net/ipv6/af_inet6.c:638
 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:00007fdd24308c68 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 000000000045e219
RDX: 00000000e0ffffff RSI: 00000000200005c0 RDI: 0000000000000004
RBP: 000000000119bfd8 R08: 0000000000000000 R09: 00000000000000d8
R10: 00000000010080fe R11: 0000000000000246 R12: 000000000119bf8c
R13: 00007ffc99e4afcf R14: 00007fdd243099c0 R15: 000000000119bf8c

The buggy address belongs to the page:
page:00000000628b865d refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x66e5f
flags: 0xfff00000000000()
raw: 00fff00000000000 ffffea0001dff408 ffffea00019b9788 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff888066e5f800: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888066e5f880: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff888066e5f900: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                  ^
 ffff888066e5f980: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888066e5fa00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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