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BUG: KASAN: use-after-free in cipso_v4_genopt.part.9.constprop.13+0x124f/0x17a0 net/ipv4/cipso_ipv4.c:1776
Read of size 1 at addr ffff888238fdf610 by task syz-executor.0/10694

CPU: 0 PID: 10694 Comm: syz-executor.0 Not tainted 5.4.0-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+0x96/0xe0 lib/dump_stack.c:118
 print_address_description.constprop.4.cold.6+0x9/0x373 mm/kasan/report.c:374
 __kasan_report.cold.7+0x7a/0x95 mm/kasan/report.c:506
 kasan_report+0xe/0x20 mm/kasan/common.c:634
 cipso_v4_genopt.part.9.constprop.13+0x124f/0x17a0 net/ipv4/cipso_ipv4.c:1776
 cipso_v4_genopt net/ipv4/cipso_ipv4.c:1767 [inline]
 cipso_v4_sock_setattr+0x6e/0x3c0 net/ipv4/cipso_ipv4.c:1858
 netlbl_sock_setattr+0x1b1/0x2c0 net/netlabel/netlabel_kapi.c:989
 smack_netlabel+0x10f/0x150 security/smack/smack_lsm.c:2431
 security_socket_post_create+0x58/0xa0 security/security.c:1981
 __sock_create+0x41f/0x5b0 net/socket.c:1434
 sock_create net/socket.c:1469 [inline]
 __sys_socket+0xd1/0x1a0 net/socket.c:1511
 __do_sys_socket net/socket.c:1520 [inline]
 __se_sys_socket net/socket.c:1518 [inline]
 __x64_sys_socket+0x6a/0xb0 net/socket.c:1518
 do_syscall_64+0x8e/0x4e0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x465ef9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f827f94f188 EFLAGS: 00000246 ORIG_RAX: 0000000000000029
RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000465ef9
RDX: 0000000000000002 RSI: 0000000000000003 RDI: 0000040000000002
RBP: 00000000004bcd1c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60
R13: 00007ffd58d8e3cf R14: 00007f827f94f300 R15: 0000000000022000

Allocated by task 1:
 save_stack+0x19/0x80 mm/kasan/common.c:69
 set_track mm/kasan/common.c:77 [inline]
 __kasan_kmalloc mm/kasan/common.c:510 [inline]
 __kasan_kmalloc.constprop.11+0xc1/0xd0 mm/kasan/common.c:483
 kmalloc include/linux/slab.h:556 [inline]
 smk_cipso_doi+0x224/0x4d0 security/smack/smackfs.c:696
 init_smk_fs+0xd4/0x154 security/smack/smackfs.c:2974
 do_one_initcall+0xc3/0x51f init/main.c:938
 do_initcall_level init/main.c:1006 [inline]
 do_initcalls init/main.c:1014 [inline]
 do_basic_setup init/main.c:1031 [inline]
 kernel_init_freeable+0x51f/0x5b9 init/main.c:1191
 kernel_init+0x7/0x123 init/main.c:1109
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352

Freed by task 5340:
 save_stack+0x19/0x80 mm/kasan/common.c:69
 set_track mm/kasan/common.c:77 [inline]
 kasan_set_free_info mm/kasan/common.c:332 [inline]
 __kasan_slab_free+0x124/0x170 mm/kasan/common.c:471
 slab_free_hook mm/slub.c:1424 [inline]
 slab_free_freelist_hook+0x53/0x140 mm/slub.c:1457
 slab_free mm/slub.c:3004 [inline]
 kfree+0xd6/0x3b0 mm/slub.c:3956
 __rcu_reclaim kernel/rcu/rcu.h:222 [inline]
 rcu_do_batch kernel/rcu/tree.c:2157 [inline]
 rcu_core+0x9bf/0x1240 kernel/rcu/tree.c:2377
 __do_softirq+0x24a/0xa97 kernel/softirq.c:292

The buggy address belongs to the object at ffff888238fdf600
 which belongs to the cache kmalloc-64 of size 64
The buggy address is located 16 bytes inside of
 64-byte region [ffff888238fdf600, ffff888238fdf640)
The buggy address belongs to the page:
page:ffffea0008e3f7c0 refcount:1 mapcount:0 mapping:ffff8880b5803180 index:0x0
raw: 057ff00000000200 ffffea0008ead980 0000000e00000002 ffff8880b5803180
raw: 0000000000000000 0000000000200020 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff888238fdf500: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc
 ffff888238fdf580: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc
>ffff888238fdf600: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
                         ^
 ffff888238fdf680: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc
 ffff888238fdf700: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc
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