syzbot

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BUG: KASAN: slab-out-of-bounds in memcpy include/linux/string.h:344 [inline]
BUG: KASAN: slab-out-of-bounds in tcp_v6_syn_recv_sock+0x1612/0x23a0 net/ipv6/tcp_ipv6.c:1076
Write of size 160 at addr ffff8801c0de3460 by task ksoftirqd/1/16

CPU: 1 PID: 16 Comm: ksoftirqd/1 Not tainted 4.15.0-rc5+ #244
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x194/0x257 lib/dump_stack.c:53
 print_address_description+0x73/0x250 mm/kasan/report.c:252
 kasan_report_error mm/kasan/report.c:351 [inline]
 kasan_report+0x25b/0x340 mm/kasan/report.c:409
 check_memory_region_inline mm/kasan/kasan.c:260 [inline]
 check_memory_region+0x137/0x190 mm/kasan/kasan.c:267
 memcpy+0x37/0x50 mm/kasan/kasan.c:303
 memcpy include/linux/string.h:344 [inline]
 tcp_v6_syn_recv_sock+0x1612/0x23a0 net/ipv6/tcp_ipv6.c:1076
 tcp_get_cookie_sock+0x102/0x540 net/ipv4/syncookies.c:213
 cookie_v4_check+0x1a87/0x2920 net/ipv4/syncookies.c:396
 tcp_v4_cookie_check net/ipv4/tcp_ipv4.c:1439 [inline]
 tcp_v4_do_rcv+0x6e9/0x7d0 net/ipv4/tcp_ipv4.c:1476
 tcp_v4_rcv+0x275f/0x2eb0 net/ipv4/tcp_ipv4.c:1735
 ip_local_deliver_finish+0x2f1/0xc50 net/ipv4/ip_input.c:216
 NF_HOOK include/linux/netfilter.h:250 [inline]
 ip_local_deliver+0x1ce/0x6e0 net/ipv4/ip_input.c:257
 dst_input include/net/dst.h:466 [inline]
 ip_rcv_finish+0x959/0x1e30 net/ipv4/ip_input.c:397
 NF_HOOK include/linux/netfilter.h:250 [inline]
 ip_rcv+0xc5a/0x1840 net/ipv4/ip_input.c:493
 __netif_receive_skb_core+0x1a41/0x3460 net/core/dev.c:4461
 __netif_receive_skb+0x2c/0x1b0 net/core/dev.c:4526
 process_backlog+0x203/0x740 net/core/dev.c:5205
 napi_poll net/core/dev.c:5603 [inline]
 net_rx_action+0x792/0x1910 net/core/dev.c:5669
 __do_softirq+0x2d7/0xb85 kernel/softirq.c:285
 run_ksoftirqd+0x50/0x100 kernel/softirq.c:666
 smpboot_thread_fn+0x450/0x7c0 kernel/smpboot.c:164
 kthread+0x33c/0x400 kernel/kthread.c:238
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:524

Allocated by task 16:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:447
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:551
 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:489
 kmem_cache_alloc+0x12e/0x760 mm/slab.c:3544
 sk_prot_alloc+0x65/0x2a0 net/core/sock.c:1463
 sk_clone_lock+0x152/0x1570 net/core/sock.c:1649
 inet_csk_clone_lock+0x92/0x4f0 net/ipv4/inet_connection_sock.c:781
 tcp_create_openreq_child+0x9b/0x1b70 net/ipv4/tcp_minisocks.c:449
 tcp_v4_syn_recv_sock+0x119/0x1270 net/ipv4/tcp_ipv4.c:1350
 tcp_v6_syn_recv_sock+0x1574/0x23a0 net/ipv6/tcp_ipv6.c:1063
 tcp_get_cookie_sock+0x102/0x540 net/ipv4/syncookies.c:213
 cookie_v4_check+0x1a87/0x2920 net/ipv4/syncookies.c:396
 tcp_v4_cookie_check net/ipv4/tcp_ipv4.c:1439 [inline]
 tcp_v4_do_rcv+0x6e9/0x7d0 net/ipv4/tcp_ipv4.c:1476
 tcp_v4_rcv+0x275f/0x2eb0 net/ipv4/tcp_ipv4.c:1735
 ip_local_deliver_finish+0x2f1/0xc50 net/ipv4/ip_input.c:216
 NF_HOOK include/linux/netfilter.h:250 [inline]
 ip_local_deliver+0x1ce/0x6e0 net/ipv4/ip_input.c:257
 dst_input include/net/dst.h:466 [inline]
 ip_rcv_finish+0x959/0x1e30 net/ipv4/ip_input.c:397
 NF_HOOK include/linux/netfilter.h:250 [inline]
 ip_rcv+0xc5a/0x1840 net/ipv4/ip_input.c:493
 __netif_receive_skb_core+0x1a41/0x3460 net/core/dev.c:4461
 __netif_receive_skb+0x2c/0x1b0 net/core/dev.c:4526
 process_backlog+0x203/0x740 net/core/dev.c:5205
 napi_poll net/core/dev.c:5603 [inline]
 net_rx_action+0x792/0x1910 net/core/dev.c:5669
 __do_softirq+0x2d7/0xb85 kernel/softirq.c:285

Freed by task 0:
(stack is not available)

The buggy address belongs to the object at ffff8801c0de2a80
 which belongs to the cache TCP of size 2528
The buggy address is located 0 bytes to the right of
 2528-byte region [ffff8801c0de2a80, ffff8801c0de3460)
The buggy address belongs to the page:
page:00000000970e19e7 count:1 mapcount:0 mapping:000000004ca425a4 index:0xffff8801c0de3ffd compound_mapcount: 0
flags: 0x2fffc0000008100(slab|head)
raw: 02fffc0000008100 ffff8801c0de2000 ffff8801c0de3ffd 0000000100000003
raw: ffffea00074cb720 ffff8801d8374148 ffff8801d7f4fc40 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801c0de3300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8801c0de3380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8801c0de3400: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc
                                                       ^
 ffff8801c0de3480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8801c0de3500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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