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BUG: KASAN: slab-out-of-bounds in dtInsertEntry+0xd74/0x1270 fs/jfs/jfs_dtree.c:4049
Read of size 4 at addr ffff88805f3a120c by task syz.4.1577/10370

CPU: 0 PID: 10370 Comm: syz.4.1577 Not tainted 5.15.184-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106
 print_address_description+0x60/0x2d0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:434 [inline]
 kasan_report+0xdf/0x130 mm/kasan/report.c:451
 dtInsertEntry+0xd74/0x1270 fs/jfs/jfs_dtree.c:4049
 dtSplitPage+0x24f7/0x31d0 fs/jfs/jfs_dtree.c:1594
 dtSplitUp fs/jfs/jfs_dtree.c:1090 [inline]
 dtInsert+0xf2a/0x5730 fs/jfs/jfs_dtree.c:869
 jfs_create+0x69d/0xa50 fs/jfs/namei.c:137
 lookup_open fs/namei.c:3462 [inline]
 open_last_lookups fs/namei.c:3532 [inline]
 path_openat+0x11e1/0x2f30 fs/namei.c:3739
 do_filp_open+0x1b3/0x3e0 fs/namei.c:3769
 do_sys_openat2+0x142/0x4a0 fs/open.c:1253
 do_sys_open fs/open.c:1269 [inline]
 __do_sys_openat fs/open.c:1285 [inline]
 __se_sys_openat fs/open.c:1280 [inline]
 __x64_sys_openat+0x135/0x160 fs/open.c:1280
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f6cfc7f4969
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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f6cfa61a038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f6cfca1c160 RCX: 00007f6cfc7f4969
RDX: 000000000000275a RSI: 0000200000000080 RDI: ffffffffffffff9c
RBP: 00007f6cfc876ab1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007f6cfca1c160 R15: 00007fff6e931a78
 </TASK>

Allocated by task 10344:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track mm/kasan/common.c:46 [inline]
 set_alloc_info mm/kasan/common.c:434 [inline]
 __kasan_slab_alloc+0x9c/0xd0 mm/kasan/common.c:467
 kasan_slab_alloc include/linux/kasan.h:254 [inline]
 slab_post_alloc_hook+0x4c/0x380 mm/slab.h:519
 slab_alloc_node mm/slub.c:3220 [inline]
 slab_alloc mm/slub.c:3228 [inline]
 kmem_cache_alloc+0x100/0x290 mm/slub.c:3233
 jfs_alloc_inode+0x17/0x50 fs/jfs/super.c:105
 alloc_inode fs/inode.c:261 [inline]
 iget_locked+0x191/0x820 fs/inode.c:1308
 jfs_iget+0x20/0x3c0 fs/jfs/inode.c:29
 jfs_lookup+0x1c2/0x380 fs/jfs/namei.c:1467
 __lookup_slow+0x27d/0x3d0 fs/namei.c:1663
 lookup_slow+0x53/0x70 fs/namei.c:1680
 walk_component+0x319/0x460 fs/namei.c:1976
 link_path_walk+0x662/0xd40 fs/namei.c:-1
 path_parentat fs/namei.c:2502 [inline]
 __filename_parentat+0x1f3/0x5f0 fs/namei.c:2526
 filename_parentat fs/namei.c:2544 [inline]
 do_renameat2+0x233/0xf70 fs/namei.c:4901
 __do_sys_renameat2 fs/namei.c:5018 [inline]
 __se_sys_renameat2 fs/namei.c:5015 [inline]
 __x64_sys_renameat2+0xce/0xe0 fs/namei.c:5015
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0

The buggy address belongs to the object at ffff88805f3a0940
 which belongs to the cache jfs_ip of size 2240
The buggy address is located 12 bytes to the right of
 2240-byte region [ffff88805f3a0940, ffff88805f3a1200)
The buggy address belongs to the page:
page:ffffea00017ce800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5f3a0
head:ffffea00017ce800 order:3 compound_mapcount:0 compound_pincount:0
memcg:ffff888061908101
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 0000000000000000 dead000000000122 ffff888146415a00
raw: 0000000000000000 00000000800d000d 00000001ffffffff ffff888061908101
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Reclaimable, gfp_mask 0x1d2050(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL|__GFP_RECLAIMABLE), pid 10344, ts 571981035826, free_ts 31857034911
 prep_new_page mm/page_alloc.c:2426 [inline]
 get_page_from_freelist+0x1b77/0x1c60 mm/page_alloc.c:4192
 __alloc_pages+0x1e1/0x470 mm/page_alloc.c:5466
 alloc_slab_page mm/slub.c:1775 [inline]
 allocate_slab mm/slub.c:1912 [inline]
 new_slab+0xc0/0x4b0 mm/slub.c:1975
 ___slab_alloc+0x81e/0xdf0 mm/slub.c:3008
 __slab_alloc mm/slub.c:3095 [inline]
 slab_alloc_node mm/slub.c:3186 [inline]
 slab_alloc mm/slub.c:3228 [inline]
 kmem_cache_alloc+0x195/0x290 mm/slub.c:3233
 jfs_alloc_inode+0x17/0x50 fs/jfs/super.c:105
 alloc_inode fs/inode.c:261 [inline]
 iget_locked+0x191/0x820 fs/inode.c:1308
 jfs_iget+0x20/0x3c0 fs/jfs/inode.c:29
 jfs_fill_super+0x735/0xaf0 fs/jfs/super.c:585
 mount_bdev+0x287/0x3c0 fs/super.c:1400
 legacy_get_tree+0xe6/0x180 fs/fs_context.c:611
 vfs_get_tree+0x88/0x270 fs/super.c:1530
 do_new_mount+0x24a/0xa40 fs/namespace.c:3014
 do_mount fs/namespace.c:3357 [inline]
 __do_sys_mount fs/namespace.c:3565 [inline]
 __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:3542
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1340 [inline]
 free_pcp_prepare mm/page_alloc.c:1391 [inline]
 free_unref_page_prepare+0x637/0x6c0 mm/page_alloc.c:3317
 free_unref_page+0x94/0x280 mm/page_alloc.c:3396
 free_contig_range+0x96/0xf0 mm/page_alloc.c:9385
 destroy_args+0xef/0x8b0 mm/debug_vm_pgtable.c:1018
 debug_vm_pgtable+0x318/0x370 mm/debug_vm_pgtable.c:1331
 do_one_initcall+0x1ee/0x680 init/main.c:1302
 do_initcall_level+0x137/0x1f0 init/main.c:1375
 do_initcalls+0x4b/0x90 init/main.c:1391
 kernel_init_freeable+0x3ce/0x560 init/main.c:1615
 kernel_init+0x19/0x1b0 init/main.c:1506
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287

Memory state around the buggy address:
 ffff88805f3a1100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88805f3a1180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88805f3a1200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                      ^
 ffff88805f3a1280: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88805f3a1300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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