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BUG: KASAN: use-after-free in keyring_compare_object+0x1d0/0x220 security/keys/keyring.c:314
Read of size 8 at addr ffff8880984a3f38 by task syz-executor.0/27288

CPU: 1 PID: 27288 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+0x197/0x210 lib/dump_stack.c:118
 print_address_description.constprop.0.cold+0xd4/0x30b mm/kasan/report.c:374
 __kasan_report.cold+0x1b/0x41 mm/kasan/report.c:506
 kasan_report+0x12/0x20 mm/kasan/common.c:634
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:132
 keyring_compare_object+0x1d0/0x220 security/keys/keyring.c:314
 assoc_array_find+0x14b/0x1f0 lib/assoc_array.c:331
 search_keyring security/keys/keyring.c:655 [inline]
 search_nested_keyrings+0xb15/0xea0 security/keys/keyring.c:722
 keyring_search_rcu+0x1b4/0x290 security/keys/keyring.c:926
 search_cred_keyrings_rcu+0x1fa/0x2e0 security/keys/process_keys.c:501
 search_process_keyrings_rcu+0x1d/0x320 security/keys/process_keys.c:544
 request_key_and_link+0x2a5/0x12b0 security/keys/request_key.c:602
 __do_sys_request_key security/keys/keyctl.c:223 [inline]
 __se_sys_request_key security/keys/keyctl.c:168 [inline]
 __ia32_sys_request_key+0x288/0x430 security/keys/keyctl.c:168
 do_syscall_32_irqs_on arch/x86/entry/common.c:333 [inline]
 do_fast_syscall_32+0x27b/0xdb3 arch/x86/entry/common.c:404
 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139
RIP: 0023:0xf7feaa39
Code: 00 00 00 89 d3 5b 5e 5f 5d c3 b8 80 96 98 00 eb c4 8b 04 24 c3 8b 1c 24 c3 8b 34 24 c3 8b 3c 24 c3 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 002b:00000000f5de60cc EFLAGS: 00000296 ORIG_RAX: 000000000000011f
RAX: ffffffffffffffda RBX: 0000000020000100 RCX: 0000000020000340
RDX: 0000000020000380 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000

Allocated by task 20567:
 save_stack+0x23/0x90 mm/kasan/common.c:69
 set_track mm/kasan/common.c:77 [inline]
 __kasan_kmalloc mm/kasan/common.c:510 [inline]
 __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:483
 kasan_slab_alloc+0xf/0x20 mm/kasan/common.c:518
 slab_post_alloc_hook mm/slab.h:584 [inline]
 slab_alloc mm/slab.c:3319 [inline]
 kmem_cache_alloc+0x121/0x710 mm/slab.c:3483
 kmem_cache_zalloc include/linux/slab.h:680 [inline]
 key_alloc+0x426/0x1110 security/keys/key.c:276
 key_create_or_update+0x652/0xbe0 security/keys/key.c:924
 __do_sys_add_key security/keys/keyctl.c:132 [inline]
 __se_sys_add_key security/keys/keyctl.c:72 [inline]
 __ia32_sys_add_key+0x2c2/0x4f0 security/keys/keyctl.c:72
 do_syscall_32_irqs_on arch/x86/entry/common.c:333 [inline]
 do_fast_syscall_32+0x27b/0xdb3 arch/x86/entry/common.c:404
 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139

Freed by task 12560:
 save_stack+0x23/0x90 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+0x102/0x150 mm/kasan/common.c:471
 kasan_slab_free+0xe/0x10 mm/kasan/common.c:480
 __cache_free mm/slab.c:3425 [inline]
 kmem_cache_free+0x86/0x320 mm/slab.c:3693
 key_gc_unused_keys.constprop.0+0x194/0x5b0 security/keys/gc.c:157
 key_garbage_collector+0x3f3/0x940 security/keys/gc.c:292
 process_one_work+0x9af/0x1740 kernel/workqueue.c:2271
 worker_thread+0x98/0xe40 kernel/workqueue.c:2417
 kthread+0x361/0x430 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352

The buggy address belongs to the object at ffff8880984a3e40
 which belongs to the cache key_jar of size 312
The buggy address is located 248 bytes inside of
 312-byte region [ffff8880984a3e40, ffff8880984a3f78)
The buggy address belongs to the page:
page:ffffea00026128c0 refcount:1 mapcount:0 mapping:ffff88821bc4f000 index:0x0
raw: 01fffc0000000200 ffffea0002477888 ffffea0002a0c648 ffff88821bc4f000
raw: 0000000000000000 ffff8880984a30c0 000000010000000a 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880984a3e00: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
 ffff8880984a3e80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8880984a3f00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc
                                        ^
 ffff8880984a3f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8880984a4000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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