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BUG: KASAN: slab-out-of-bounds in fl6_update_dst+0x2bb/0x2c0 net/ipv6/exthdrs.c:1356
Read of size 16 at addr ffff8880959a8ce8 by task syz-executor.2/31982

CPU: 1 PID: 31982 Comm: syz-executor.2 Not tainted 5.7.0-rc5-syzkaller #0
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+0x188/0x20d lib/dump_stack.c:118
 print_address_description.constprop.0.cold+0xd3/0x413 mm/kasan/report.c:382
 __kasan_report.cold+0x20/0x38 mm/kasan/report.c:511
 kasan_report+0x33/0x50 mm/kasan/common.c:625
 fl6_update_dst+0x2bb/0x2c0 net/ipv6/exthdrs.c:1356
 ip6_datagram_dst_update+0x587/0xc80 net/ipv6/datagram.c:85
 __ip6_datagram_connect+0x5e9/0x15d0 net/ipv6/datagram.c:247
 ip6_datagram_connect+0x2b/0x40 net/ipv6/datagram.c:271
 ip6_datagram_connect_v6_only+0x63/0x90 net/ipv6/datagram.c:283
 inet_dgram_connect+0x14a/0x2d0 net/ipv4/af_inet.c:574
 __sys_connect_file+0x155/0x1a0 net/socket.c:1854
 __sys_connect+0x160/0x190 net/socket.c:1871
 __do_sys_connect net/socket.c:1882 [inline]
 __se_sys_connect net/socket.c:1879 [inline]
 __x64_sys_connect+0x6f/0xb0 net/socket.c:1879
 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x49/0xb3
RIP: 0033:0x45ca29
Code: 0d b7 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 b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fa97f79cc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002a
RAX: ffffffffffffffda RBX: 00000000004daf40 RCX: 000000000045ca29
RDX: 000000000000001c RSI: 00000000200000c0 RDI: 0000000000000006
RBP: 000000000078bfa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000084 R14: 00000000004c33c2 R15: 00007fa97f79d6d4

Allocated by task 31982:
 save_stack+0x1b/0x40 mm/kasan/common.c:49
 set_track mm/kasan/common.c:57 [inline]
 __kasan_kmalloc mm/kasan/common.c:495 [inline]
 __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:468
 __do_kmalloc mm/slab.c:3656 [inline]
 __kmalloc+0x161/0x7a0 mm/slab.c:3665
 kmalloc include/linux/slab.h:560 [inline]
 sock_kmalloc net/core/sock.c:2174 [inline]
 sock_kmalloc+0xb5/0x100 net/core/sock.c:2165
 ipv6_renew_options+0x274/0x940 net/ipv6/exthdrs.c:1275
 do_ipv6_setsockopt.isra.0+0x2e75/0x41c0 net/ipv6/ipv6_sockglue.c:470
 ipv6_setsockopt+0xfb/0x180 net/ipv6/ipv6_sockglue.c:956
 rawv6_setsockopt+0x55/0x140 net/ipv6/raw.c:1081
 __sys_setsockopt+0x248/0x480 net/socket.c:2127
 __do_sys_setsockopt net/socket.c:2143 [inline]
 __se_sys_setsockopt net/socket.c:2140 [inline]
 __x64_sys_setsockopt+0xba/0x150 net/socket.c:2140
 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x49/0xb3

Freed by task 31301:
 save_stack+0x1b/0x40 mm/kasan/common.c:49
 set_track mm/kasan/common.c:57 [inline]
 kasan_set_free_info mm/kasan/common.c:317 [inline]
 __kasan_slab_free+0xf7/0x140 mm/kasan/common.c:456
 __cache_free mm/slab.c:3426 [inline]
 kfree+0x109/0x2b0 mm/slab.c:3757
 hash_ipmark4_destroy+0x27a/0x400 net/netfilter/ipset/ip_set_hash_gen.h:489
 ip_set_create+0xd82/0x13b0 net/netfilter/ipset/ip_set_core.c:1180
 nfnetlink_rcv_msg+0xc83/0xf30 net/netfilter/nfnetlink.c:229
 netlink_rcv_skb+0x15a/0x410 net/netlink/af_netlink.c:2469
 nfnetlink_rcv+0x1ac/0x420 net/netfilter/nfnetlink.c:563
 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline]
 netlink_unicast+0x537/0x740 net/netlink/af_netlink.c:1329
 netlink_sendmsg+0x882/0xe10 net/netlink/af_netlink.c:1918
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:672
 ____sys_sendmsg+0x6e6/0x810 net/socket.c:2352
 ___sys_sendmsg+0x100/0x170 net/socket.c:2406
 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2439
 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x49/0xb3

The buggy address belongs to the object at ffff8880959a8c00
 which belongs to the cache kmalloc-256 of size 256
The buggy address is located 232 bytes inside of
 256-byte region [ffff8880959a8c00, ffff8880959a8d00)
The buggy address belongs to the page:
page:ffffea0002566a00 refcount:1 mapcount:0 mapping:00000000434b58b1 index:0xffff8880959a8a00
flags: 0xfffe0000000200(slab)
raw: 00fffe0000000200 ffffea00024f2388 ffffea00029ffb08 ffff8880aa0008c0
raw: ffff8880959a8a00 ffff8880959a8000 0000000100000006 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880959a8b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8880959a8c00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8880959a8c80: 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc
                                                          ^
 ffff8880959a8d00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8880959a8d80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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