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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 8928 at addr ffff888029234c20 by task syz-executor.1/22866

CPU: 1 PID: 22866 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]
 cake_enqueue+0x2808/0x39f0 net/sched/sch_cake.c:1742
 __dev_xmit_skb net/core/dev.c:3807 [inline]
 __dev_queue_xmit+0x1913/0x2dd0 net/core/dev.c:4119
 neigh_hh_output include/net/neighbour.h:499 [inline]
 neigh_output include/net/neighbour.h:508 [inline]
 ip6_finish_output2+0x8db/0x16c0 net/ipv6/ip6_output.c:117
 __ip6_finish_output net/ipv6/ip6_output.c:182 [inline]
 __ip6_finish_output+0x4c1/0xe10 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_sendmsg_locked+0xa1c/0x2e40 net/ipv4/tcp.c:1410
 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:00007f17c9641c68 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 000000000045e219
RDX: 00000000fffffdda RSI: 00000000200000c0 RDI: 0000000000000009
RBP: 000000000119c128 R08: 0000000000000000 R09: 0600000000000004
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119c0dc
R13: 00007ffcabe254ff R14: 00007f17c96429c0 R15: 000000000119c0dc

Allocated by task 22861:
 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
 add_port drivers/infiniband/core/sysfs.c:1109 [inline]
 ib_setup_port_attrs+0x42b/0x14f0 drivers/infiniband/core/sysfs.c:1395
 add_one_compat_dev+0x4ab/0x800 drivers/infiniband/core/device.c:954
 rdma_dev_init_net+0x2dc/0x480 drivers/infiniband/core/device.c:1170
 ops_init+0xaf/0x470 net/core/net_namespace.c:152
 setup_net+0x2de/0x850 net/core/net_namespace.c:342
 copy_net_ns+0x31e/0x760 net/core/net_namespace.c:483
 create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110
 unshare_nsproxy_namespaces+0xbd/0x1f0 kernel/nsproxy.c:226
 ksys_unshare+0x445/0x8e0 kernel/fork.c:2957
 __do_sys_unshare kernel/fork.c:3025 [inline]
 __se_sys_unshare kernel/fork.c:3023 [inline]
 __x64_sys_unshare+0x2d/0x40 kernel/fork.c:3023
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

The buggy address belongs to the object at ffff888029234bc8
 which belongs to the cache kernfs_node_cache of size 168
The buggy address is located 88 bytes inside of
 168-byte region [ffff888029234bc8, ffff888029234c70)
The buggy address belongs to the page:
page:0000000096a69c34 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x29234
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:
 ffff888029234b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888029234b80: 00 fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00
>ffff888029234c00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc
                               ^
 ffff888029234c80: fc fc fc fc fc fc 00 00 00 00 00 00 00 00 00 00
 ffff888029234d00: 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc
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