mount with iocharset=utf8 to access
------------[ cut here ]------------
UBSAN: array-index-out-of-bounds in fs/jfs/jfs_dtree.c:3622:7
index -1 is out of range for type 'struct dtslot[128]'
CPU: 1 PID: 6505 Comm: syz.0.36 Not tainted 6.10.0-rc7-syzkaller-gc912bf709078 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
Call trace:
 dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:317
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:324
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:114
 dump_stack+0x1c/0x28 lib/dump_stack.c:123
 ubsan_epilogue lib/ubsan.c:231 [inline]
 __ubsan_handle_out_of_bounds+0xf8/0x148 lib/ubsan.c:429
 dtInsertEntry+0x113c/0x1178 fs/jfs/jfs_dtree.c:3622
 dtInsert+0x964/0x54f4 fs/jfs/jfs_dtree.c:891
 jfs_create+0x698/0xa04 fs/jfs/namei.c:137
 lookup_open fs/namei.c:3552 [inline]
 open_last_lookups fs/namei.c:3621 [inline]
 path_openat+0xfb8/0x2ae8 fs/namei.c:3857
 do_filp_open+0x1bc/0x3cc fs/namei.c:3887
 do_sys_openat2+0x124/0x1b8 fs/open.c:1413
 do_sys_open fs/open.c:1428 [inline]
 __do_sys_openat fs/open.c:1444 [inline]
 __se_sys_openat fs/open.c:1439 [inline]
 __arm64_sys_openat+0x1f0/0x240 fs/open.c:1439
 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:48
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:131
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:150
 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712
 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730
 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598
---[ end trace ]---
------------[ cut here ]------------
UBSAN: array-index-out-of-bounds in fs/jfs/jfs_imap.c:750:12
index 255 is out of range for type 'struct dtslot[128]'
CPU: 1 PID: 6505 Comm: syz.0.36 Not tainted 6.10.0-rc7-syzkaller-gc912bf709078 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
Call trace:
 dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:317
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:324
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:114
 dump_stack+0x1c/0x28 lib/dump_stack.c:123
 ubsan_epilogue lib/ubsan.c:231 [inline]
 __ubsan_handle_out_of_bounds+0xf8/0x148 lib/ubsan.c:429
 diWrite+0xbcc/0x15cc fs/jfs/jfs_imap.c:750
 txCommit+0x750/0x5438 fs/jfs/jfs_txnmgr.c:1255
 jfs_create+0x810/0xa04 fs/jfs/namei.c:156
 lookup_open fs/namei.c:3552 [inline]
 open_last_lookups fs/namei.c:3621 [inline]
 path_openat+0xfb8/0x2ae8 fs/namei.c:3857
 do_filp_open+0x1bc/0x3cc fs/namei.c:3887
 do_sys_openat2+0x124/0x1b8 fs/open.c:1413
 do_sys_open fs/open.c:1428 [inline]
 __do_sys_openat fs/open.c:1444 [inline]
 __se_sys_openat fs/open.c:1439 [inline]
 __arm64_sys_openat+0x1f0/0x240 fs/open.c:1439
 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:48
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:131
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:150
 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712
 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730
 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598
---[ end trace ]---
------------[ cut here ]------------
UBSAN: array-index-out-of-bounds in fs/jfs/jfs_imap.c:750:35
index 255 is out of range for type 'struct dtslot[128]'
CPU: 1 PID: 6505 Comm: syz.0.36 Not tainted 6.10.0-rc7-syzkaller-gc912bf709078 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
Call trace:
 dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:317
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:324
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:114
 dump_stack+0x1c/0x28 lib/dump_stack.c:123
 ubsan_epilogue lib/ubsan.c:231 [inline]
 __ubsan_handle_out_of_bounds+0xf8/0x148 lib/ubsan.c:429
 diWrite+0xc24/0x15cc fs/jfs/jfs_imap.c:750
 txCommit+0x750/0x5438 fs/jfs/jfs_txnmgr.c:1255
 jfs_create+0x810/0xa04 fs/jfs/namei.c:156
 lookup_open fs/namei.c:3552 [inline]
 open_last_lookups fs/namei.c:3621 [inline]
 path_openat+0xfb8/0x2ae8 fs/namei.c:3857
 do_filp_open+0x1bc/0x3cc fs/namei.c:3887
 do_sys_openat2+0x124/0x1b8 fs/open.c:1413
 do_sys_open fs/open.c:1428 [inline]
 __do_sys_openat fs/open.c:1444 [inline]
 __se_sys_openat fs/open.c:1439 [inline]
 __arm64_sys_openat+0x1f0/0x240 fs/open.c:1439
 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:48
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:131
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:150
 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712
 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730
 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598
---[ end trace ]---
==================================================================
BUG: KASAN: use-after-free in diWrite+0xb48/0x15cc fs/jfs/jfs_imap.c:750
Write of size 32 at addr ffff0000dcac94c0 by task syz.0.36/6505

CPU: 1 PID: 6505 Comm: syz.0.36 Not tainted 6.10.0-rc7-syzkaller-gc912bf709078 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
Call trace:
 dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:317
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:324
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:114
 print_address_description mm/kasan/report.c:377 [inline]
 print_report+0x198/0x538 mm/kasan/report.c:488
 kasan_report+0xd8/0x138 mm/kasan/report.c:601
 kasan_check_range+0x268/0x2a8 mm/kasan/generic.c:189
 __asan_memcpy+0x54/0x84 mm/kasan/shadow.c:106
 diWrite+0xb48/0x15cc fs/jfs/jfs_imap.c:750
 txCommit+0x750/0x5438 fs/jfs/jfs_txnmgr.c:1255
 jfs_create+0x810/0xa04 fs/jfs/namei.c:156
 lookup_open fs/namei.c:3552 [inline]
 open_last_lookups fs/namei.c:3621 [inline]
 path_openat+0xfb8/0x2ae8 fs/namei.c:3857
 do_filp_open+0x1bc/0x3cc fs/namei.c:3887
 do_sys_openat2+0x124/0x1b8 fs/open.c:1413
 do_sys_open fs/open.c:1428 [inline]
 __do_sys_openat fs/open.c:1444 [inline]
 __se_sys_openat fs/open.c:1439 [inline]
 __arm64_sys_openat+0x1f0/0x240 fs/open.c:1439
 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:48
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:131
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:150
 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712
 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730
 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11cac9
flags: 0x5ffc00000000000(node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000000000 dead000000000100 dead000000000122 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000dcac9380: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff0000dcac9400: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff0000dcac9480: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                           ^
 ffff0000dcac9500: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff0000dcac9580: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================