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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 ffff888089363158 by task syz-executor.0/9550

CPU: 1 PID: 9550 Comm: syz-executor.0 Not tainted 5.7.0-rc6-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:571
 __sys_connect_file+0x155/0x1a0 net/socket.c:1859
 __sys_connect+0x160/0x190 net/socket.c:1876
 __do_sys_connect net/socket.c:1887 [inline]
 __se_sys_connect net/socket.c:1884 [inline]
 __ia32_sys_connect+0x6e/0xb0 net/socket.c:1884
 do_syscall_32_irqs_on arch/x86/entry/common.c:337 [inline]
 do_fast_syscall_32+0x270/0xe90 arch/x86/entry/common.c:396
 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139

Allocated by task 9550:
 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:2166 [inline]
 sock_kmalloc+0xb5/0x100 net/core/sock.c:2157
 ipv6_renew_options+0x274/0x940 net/ipv6/exthdrs.c:1275
 do_ipv6_setsockopt.isra.0+0x2eaf/0x42f0 net/ipv6/ipv6_sockglue.c:435
 compat_ipv6_setsockopt net/ipv6/ipv6_sockglue.c:980 [inline]
 compat_ipv6_setsockopt+0x115/0x210 net/ipv6/ipv6_sockglue.c:961
 compat_rawv6_setsockopt+0x55/0x140 net/ipv6/raw.c:1104
 compat_sock_common_setsockopt+0xaa/0x120 net/core/sock.c:3182
 __compat_sys_setsockopt+0x15d/0x310 net/compat.c:400
 __do_compat_sys_setsockopt net/compat.c:413 [inline]
 __se_compat_sys_setsockopt net/compat.c:410 [inline]
 __ia32_compat_sys_setsockopt+0xb9/0x150 net/compat.c:410
 do_syscall_32_irqs_on arch/x86/entry/common.c:337 [inline]
 do_fast_syscall_32+0x270/0xe90 arch/x86/entry/common.c:396
 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139

Freed by task 17433:
 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]
 kmem_cache_free_bulk+0x7d/0x280 mm/slab.c:3721
 kfree_bulk include/linux/slab.h:412 [inline]
 kfree_rcu_work+0x1a1/0x480 kernel/rcu/tree.c:2859
 process_one_work+0x965/0x16a0 kernel/workqueue.c:2268
 worker_thread+0x96/0xe20 kernel/workqueue.c:2414
 kthread+0x388/0x470 kernel/kthread.c:268
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:351

The buggy address belongs to the object at ffff888089363100
 which belongs to the cache kmalloc-96 of size 96
The buggy address is located 88 bytes inside of
 96-byte region [ffff888089363100, ffff888089363160)
The buggy address belongs to the page:
page:ffffea000224d8c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0
flags: 0xfffe0000000200(slab)
raw: 00fffe0000000200 ffffea00015d9dc8 ffffea0000e724c8 ffff8880aa000540
raw: 0000000000000000 ffff888089363000 0000000100000020 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff888089363000: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
 ffff888089363080: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
>ffff888089363100: 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc
                                                    ^
 ffff888089363180: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
 ffff888089363200: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
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