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BUG: KASAN: use-after-free in ext4_htree_fill_tree+0x1316/0x13e0 fs/ext4/namei.c:1220
Read of size 1 at addr ffff888117087a67 by task syz-executor/500

CPU: 0 PID: 500 Comm: syz-executor Not tainted 5.10.222-syzkaller-1003210-gfd58936f3c1f #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack_lvl+0x1e2/0x24b lib/dump_stack.c:118
 print_address_description+0x81/0x3b0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:435 [inline]
 kasan_report+0x179/0x1c0 mm/kasan/report.c:452
 __asan_report_load1_noabort+0x14/0x20 mm/kasan/report_generic.c:306
 ext4_htree_fill_tree+0x1316/0x13e0 fs/ext4/namei.c:1220
 ext4_dx_readdir fs/ext4/dir.c:598 [inline]
 ext4_readdir+0x2dde/0x37c0 fs/ext4/dir.c:142
 iterate_dir+0x265/0x580
 __do_sys_getdents64 fs/readdir.c:369 [inline]
 __se_sys_getdents64+0x1c1/0x460 fs/readdir.c:354
 __x64_sys_getdents64+0x7b/0x90 fs/readdir.c:354
 do_syscall_64+0x34/0x70
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7fef18aeebf3
Code: c1 66 0f 1f 44 00 00 48 83 c4 08 48 89 ef 5b 5d e9 f2 44 f8 ff 66 90 b8 ff ff ff 7f 48 39 c2 48 0f 47 d0 b8 d9 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 05 c3 0f 1f 40 00 48 c7 c2 a8 ff ff ff f7 d8
RSP: 002b:00007ffe968e9838 EFLAGS: 00000293 ORIG_RAX: 00000000000000d9
RAX: ffffffffffffffda RBX: 00005555557294e0 RCX: 00007fef18aeebf3
RDX: 0000000000008000 RSI: 00005555557294e0 RDI: 0000000000000005
RBP: 00005555557294b4 R08: 0000000000028b61 R09: 0000000000000000
R10: 00007fef18c1bca0 R11: 0000000000000293 R12: ffffffffffffffa8
R13: 0000000000000010 R14: 00005555557294b0 R15: 000000000000d289

Allocated by task 149:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track mm/kasan/common.c:45 [inline]
 set_alloc_info mm/kasan/common.c:430 [inline]
 __kasan_slab_alloc+0xb1/0xe0 mm/kasan/common.c:463
 kasan_slab_alloc include/linux/kasan.h:244 [inline]
 slab_post_alloc_hook+0x61/0x2f0 mm/slab.h:583
 slab_alloc_node mm/slub.c:2947 [inline]
 slab_alloc mm/slub.c:2955 [inline]
 kmem_cache_alloc+0x168/0x2e0 mm/slub.c:2960
 prepare_creds+0x2f/0x5f0 kernel/cred.c:261
 access_override_creds fs/open.c:354 [inline]
 do_faccessat+0xee/0x810 fs/open.c:418
 __do_sys_access fs/open.c:483 [inline]
 __se_sys_access fs/open.c:481 [inline]
 __x64_sys_access+0x61/0x70 fs/open.c:481
 do_syscall_64+0x34/0x70
 entry_SYSCALL_64_after_hwframe+0x61/0xcb

The buggy address belongs to the object at ffff888117087a00
 which belongs to the cache cred_jar of size 168
The buggy address is located 103 bytes inside of
 168-byte region [ffff888117087a00, ffff888117087aa8)
The buggy address belongs to the page:
page:ffffea00045c21c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888117087e00 pfn:0x117087
flags: 0x4000000000000200(slab)
raw: 4000000000000200 ffffea0004581840 0000000b0000000b ffff888100191800
raw: ffff888117087e00 0000000080100006 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 143, ts 4891326243, free_ts 0
 set_page_owner include/linux/page_owner.h:35 [inline]
 post_alloc_hook mm/page_alloc.c:2456 [inline]
 prep_new_page+0x166/0x180 mm/page_alloc.c:2462
 get_page_from_freelist+0x2d8c/0x2f30 mm/page_alloc.c:4254
 __alloc_pages_nodemask+0x435/0xaf0 mm/page_alloc.c:5348
 allocate_slab mm/slub.c:1808 [inline]
 new_slab+0x80/0x400 mm/slub.c:1869
 new_slab_objects mm/slub.c:2627 [inline]
 ___slab_alloc+0x302/0x4b0 mm/slub.c:2791
 __slab_alloc+0x63/0xa0 mm/slub.c:2831
 slab_alloc_node mm/slub.c:2913 [inline]
 slab_alloc mm/slub.c:2955 [inline]
 kmem_cache_alloc+0x1b9/0x2e0 mm/slub.c:2960
 prepare_creds+0x2f/0x5f0 kernel/cred.c:261
 access_override_creds fs/open.c:354 [inline]
 do_faccessat+0xee/0x810 fs/open.c:418
 __do_sys_access fs/open.c:483 [inline]
 __se_sys_access fs/open.c:481 [inline]
 __x64_sys_access+0x61/0x70 fs/open.c:481
 do_syscall_64+0x34/0x70
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
page_owner free stack trace missing

Memory state around the buggy address:
 ffff888117087900: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888117087980: fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc
>ffff888117087a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                       ^
 ffff888117087a80: fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc
 ffff888117087b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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