==================================================================
BUG: KASAN: use-after-free in diWrite+0x91c/0x1218 fs/jfs/jfs_imap.c:753
Write of size 32 at addr ffff0000e45d04e0 by task syz.2.262/5552

CPU: 1 PID: 5552 Comm: syz.2.262 Not tainted 5.15.181-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025
Call trace:
 dump_backtrace+0x0/0x43c arch/arm64/kernel/stacktrace.c:152
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216
 __dump_stack+0x30/0x40 lib/dump_stack.c:88
 dump_stack_lvl+0xf8/0x160 lib/dump_stack.c:106
 print_address_description+0x78/0x30c mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:434 [inline]
 kasan_report+0xec/0x15c mm/kasan/report.c:451
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x270/0x2b0 mm/kasan/generic.c:189
 memcpy+0xb4/0xe8 mm/kasan/shadow.c:66
 diWrite+0x91c/0x1218 fs/jfs/jfs_imap.c:753
 txCommit+0x5d4/0x3c1c fs/jfs/jfs_txnmgr.c:1255
 add_missing_indices+0x6e4/0xa0c fs/jfs/jfs_dtree.c:2960
 jfs_readdir+0x1880/0x3024 fs/jfs/jfs_dtree.c:3316
 iterate_dir+0x1f0/0x4cc fs/readdir.c:-1
 __do_sys_getdents64 fs/readdir.c:369 [inline]
 __se_sys_getdents64 fs/readdir.c:354 [inline]
 __arm64_sys_getdents64+0x11c/0x340 fs/readdir.c:354
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584

The buggy address belongs to the page:
page:00000000fc3faead refcount:0 mapcount:-128 mapping:0000000000000000 index:0x0 pfn:0x1245d0
flags: 0x5ffc00000000000(node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000000000 fffffc0003ae3c08 fffffc0003919408 0000000000000000
raw: 0000000000000000 0000000000000004 00000000ffffff7f 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000e45d0380: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff0000e45d0400: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff0000e45d0480: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                                       ^
 ffff0000e45d0500: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff0000e45d0580: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================

 ... Log Wrap ... Log Wrap ... Log Wrap ...


 ... Log Wrap ... Log Wrap ... Log Wrap ...


 ... Log Wrap ... Log Wrap ... Log Wrap ...

ERROR: (device loop2): jfs_readdir: JFS:Dtree error: ino = 2, bn=0, index = 0

ERROR: (device loop2): remounting filesystem as read-only
JFS: Invalid stbl[1] = -128 for inode 2, block = 0