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BUG: KASAN: slab-out-of-bounds in ext4_htree_fill_tree+0x1316/0x13e0 fs/ext4/namei.c:1220
Read of size 1 at addr ffff8881085a5a67 by task syz-executor255/286

CPU: 0 PID: 286 Comm: syz-executor255 Not tainted 5.10.221-syzkaller-01371-g1240968f7644 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
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: 0033:0x7f7a12597ca3
Code: c1 66 0f 1f 44 00 00 48 83 c4 08 48 89 ef 5b 5d e9 e2 0f fb 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 b8 ff ff ff f7 d8
RSP: 002b:00007ffdddbaf8b8 EFLAGS: 00000293 ORIG_RAX: 00000000000000d9
RAX: ffffffffffffffda RBX: 0000555556787730 RCX: 00007f7a12597ca3
RDX: 0000000000008000 RSI: 0000555556787730 RDI: 0000000000000004
RBP: 0000555556787704 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000001000 R11: 0000000000000293 R12: ffffffffffffffb8
R13: 0000000000000010 R14: 0000555556787700 R15: 0000000000000001

Allocated by task 1:
 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
 kmem_cache_zalloc include/linux/slab.h:654 [inline]
 __kernfs_new_node+0xdb/0x700 fs/kernfs/dir.c:662
 kernfs_new_node+0x130/0x230 fs/kernfs/dir.c:739
 kernfs_create_dir_ns+0x44/0x130 fs/kernfs/dir.c:1087
 sysfs_create_dir_ns+0x185/0x390 fs/sysfs/dir.c:59
 create_dir lib/kobject.c:89 [inline]
 kobject_add_internal+0x763/0xd90 lib/kobject.c:263
 kobject_add_varg lib/kobject.c:398 [inline]
 kobject_init_and_add+0x120/0x190 lib/kobject.c:481
 locate_module_kobject+0xe4/0x164 kernel/params.c:776
 kernel_add_sysfs_param+0x24/0x12d kernel/params.c:803
 param_sysfs_builtin+0x16a/0x1e2 kernel/params.c:851
 param_sysfs_init+0x6a/0x6f kernel/params.c:972
 do_one_initcall+0x189/0x620 init/main.c:1197
 do_initcall_level+0x186/0x304 init/main.c:1270
 do_initcalls+0x4e/0x8e init/main.c:1286
 do_basic_setup+0x88/0x91 init/main.c:1306
 kernel_init_freeable+0x2be/0x3f5 init/main.c:1510
 kernel_init+0x11/0x280 init/main.c:1397
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298

The buggy address belongs to the object at ffff8881085a59c0
 which belongs to the cache kernfs_node_cache of size 144
The buggy address is located 23 bytes to the right of
 144-byte region [ffff8881085a59c0, ffff8881085a5a50)
The buggy address belongs to the page:
page:ffffea0004216940 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8881085a5680 pfn:0x1085a5
flags: 0x4000000000000200(slab)
raw: 4000000000000200 ffffea0004216988 ffffea0004216888 ffff888100192000
raw: ffff8881085a5680 000000000013000e 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 1, ts 985291219, 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
 kmem_cache_zalloc include/linux/slab.h:654 [inline]
 __kernfs_new_node+0xdb/0x700 fs/kernfs/dir.c:662
 kernfs_new_node+0x130/0x230 fs/kernfs/dir.c:739
 __kernfs_create_file+0x4a/0x270 fs/kernfs/file.c:987
 sysfs_add_file_mode_ns+0x273/0x320 fs/sysfs/file.c:306
 create_files fs/sysfs/group.c:64 [inline]
 internal_create_group+0x573/0xf00 fs/sysfs/group.c:149
 sysfs_create_group+0x1f/0x30 fs/sysfs/group.c:175
 kernel_add_sysfs_param+0xea/0x12d kernel/params.c:814
 param_sysfs_builtin+0x16a/0x1e2 kernel/params.c:851
 param_sysfs_init+0x6a/0x6f kernel/params.c:972
page_owner free stack trace missing

Memory state around the buggy address:
 ffff8881085a5900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8881085a5980: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00
>ffff8881085a5a00: 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc
                                                       ^
 ffff8881085a5a80: fc fc fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8881085a5b00: fb fb fb fb fc fc fc fc fc fc fc fc 00 00 00 00
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