protocol 86dd is buggy, dev sit0
protocol 86dd is buggy, dev sit0
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BUG: KASAN: slab-out-of-bounds in memcpy include/linux/string.h:352 [inline]
BUG: KASAN: slab-out-of-bounds in skb_copy_from_linear_data include/linux/skbuff.h:3414 [inline]
BUG: KASAN: slab-out-of-bounds in __pskb_copy_fclone+0x2dd/0xeb0 net/core/skbuff.c:1395
Read of size 4294967282 at addr ffff8801b7408a5c by task syz-executor0/20063

CPU: 0 PID: 20063 Comm: syz-executor0 Not tainted 4.20.0-rc1+ #141
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+0x244/0x39d lib/dump_stack.c:113
 print_address_description.cold.7+0x9/0x1ff mm/kasan/report.c:256
 kasan_report_error mm/kasan/report.c:354 [inline]
 kasan_report.cold.8+0x242/0x309 mm/kasan/report.c:412
 check_memory_region_inline mm/kasan/kasan.c:260 [inline]
 check_memory_region+0x13e/0x1b0 mm/kasan/kasan.c:267
 memcpy+0x23/0x50 mm/kasan/kasan.c:302
 memcpy include/linux/string.h:352 [inline]
 skb_copy_from_linear_data include/linux/skbuff.h:3414 [inline]
 __pskb_copy_fclone+0x2dd/0xeb0 net/core/skbuff.c:1395
 __pskb_copy include/linux/skbuff.h:1053 [inline]
 pskb_copy include/linux/skbuff.h:2897 [inline]
 skb_realloc_headroom+0xe7/0x120 net/core/skbuff.c:1539
 ipip6_tunnel_xmit net/ipv6/sit.c:965 [inline]
 sit_tunnel_xmit+0xe1b/0x30d0 net/ipv6/sit.c:1029
 __netdev_start_xmit include/linux/netdevice.h:4344 [inline]
 netdev_start_xmit include/linux/netdevice.h:4353 [inline]
 xmit_one net/core/dev.c:3252 [inline]
 dev_hard_start_xmit+0x295/0xc80 net/core/dev.c:3268
 __dev_queue_xmit+0x2f71/0x3ad0 net/core/dev.c:3838
 dev_queue_xmit+0x17/0x20 net/core/dev.c:3871
 __bpf_tx_skb net/core/filter.c:2017 [inline]
 __bpf_redirect_common net/core/filter.c:2055 [inline]
 __bpf_redirect+0x5cf/0xb20 net/core/filter.c:2062
 ____bpf_clone_redirect net/core/filter.c:2095 [inline]
 bpf_clone_redirect+0x2f6/0x490 net/core/filter.c:2067
 bpf_prog_41f2bcae09cd4ac3+0xd27/0x1000

Allocated by task 20063:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:448
 set_track mm/kasan/kasan.c:460 [inline]
 kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:553
 __do_kmalloc_node mm/slab.c:3684 [inline]
 __kmalloc_node_track_caller+0x50/0x70 mm/slab.c:3698
 __kmalloc_reserve.isra.40+0x41/0xe0 net/core/skbuff.c:137
 pskb_expand_head+0x230/0x10f0 net/core/skbuff.c:1460
 skb_ensure_writable+0x3dd/0x640 net/core/skbuff.c:5073
 __bpf_try_make_writable net/core/filter.c:1638 [inline]
 bpf_try_make_writable net/core/filter.c:1644 [inline]
 bpf_try_make_head_writable net/core/filter.c:1652 [inline]
 ____bpf_clone_redirect net/core/filter.c:2089 [inline]
 bpf_clone_redirect+0x14a/0x490 net/core/filter.c:2067
 bpf_prog_41f2bcae09cd4ac3+0xd27/0x1000

Freed by task 18614:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:448
 set_track mm/kasan/kasan.c:460 [inline]
 __kasan_slab_free+0x102/0x150 mm/kasan/kasan.c:521
 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528
 __cache_free mm/slab.c:3498 [inline]
 kfree+0xcf/0x230 mm/slab.c:3817
 sctp_endpoint_destroy net/sctp/endpointola.c:281 [inline]
 sctp_endpoint_put+0x22d/0x2c0 net/sctp/endpointola.c:297
 sctp_endpoint_free+0x71/0x90 net/sctp/endpointola.c:240
 sctp_destroy_sock+0xe6/0x550 net/sctp/socket.c:4829
 sk_common_release+0x6d/0x320 net/core/sock.c:2999
 sctp_close+0x504/0xad0 net/sctp/socket.c:1564
 inet_release+0x104/0x1f0 net/ipv4/af_inet.c:428
 __sock_release+0xd7/0x250 net/socket.c:579
 sock_close+0x19/0x20 net/socket.c:1141
 __fput+0x385/0xa30 fs/file_table.c:278
 ____fput+0x15/0x20 fs/file_table.c:309
 task_work_run+0x1e8/0x2a0 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_usermode_loop+0x318/0x380 arch/x86/entry/common.c:166
 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:268 [inline]
 do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff8801b7408a00
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 92 bytes inside of
 512-byte region [ffff8801b7408a00, ffff8801b7408c00)
The buggy address belongs to the page:
page:ffffea0006dd0200 count:1 mapcount:0 mapping:ffff8801da800940 index:0xffff8801b7408780
flags: 0x2fffc0000000200(slab)
raw: 02fffc0000000200 ffffea0007320b48 ffffea0006ed4b08 ffff8801da800940
raw: ffff8801b7408780 ffff8801b7408000 0000000100000005 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801b7408b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8801b7408b80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8801b7408c00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                   ^
 ffff8801b7408c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8801b7408d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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