f2fs: fix to avoid panic in f2fs_evict_inode

In the Linux kernel, the following vulnerability has been resolved:

f2fs: fix to avoid panic in f2fs_evict_inode

As syzbot [1] reported as below:

R10: 0000000000000100 R11: 0000000000000206 R12: 00007ffe17473450

R13: 00007f28b1c10854 R14: 000000000000dae5 R15: 00007ffe17474520

</TASK>

---[ end trace 0000000000000000 ]---

==================================================================

BUG: KASAN: use-after-free in __list_del_entry_valid+0xa6/0x130 lib/list_debug.c:62

Read of size 8 at addr ffff88812d962278 by task syz-executor/564

CPU: 1 PID: 564 Comm: syz-executor Tainted: G W 6.1.129-syzkaller #0

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025

Call Trace:

<TASK>

__dump_stack+0x21/0x24 lib/dump_stack.c:88

dump_stack_lvl+0xee/0x158 lib/dump_stack.c:106

print_address_description+0x71/0x210 mm/kasan/report.c:316

print_report+0x4a/0x60 mm/kasan/report.c:427

kasan_report+0x122/0x150 mm/kasan/report.c:531

__asan_report_load8_noabort+0x14/0x20 mm/kasan/report_generic.c:351

__list_del_entry_valid+0xa6/0x130 lib/list_debug.c:62

__list_del_entry include/linux/list.h:134 [inline]

list_del_init include/linux/list.h:206 [inline]

f2fs_inode_synced+0xf7/0x2e0 fs/f2fs/super.c:1531

f2fs_update_inode+0x74/0x1c40 fs/f2fs/inode.c:585

f2fs_update_inode_page+0x137/0x170 fs/f2fs/inode.c:703

f2fs_write_inode+0x4ec/0x770 fs/f2fs/inode.c:731

write_inode fs/fs-writeback.c:1460 [inline]

__writeback_single_inode+0x4a0/0xab0 fs/fs-writeback.c:1677

writeback_single_inode+0x221/0x8b0 fs/fs-writeback.c:1733

sync_inode_metadata+0xb6/0x110 fs/fs-writeback.c:2789

f2fs_sync_inode_meta+0x16d/0x2a0 fs/f2fs/checkpoint.c:1159

block_operations fs/f2fs/checkpoint.c:1269 [inline]

f2fs_write_checkpoint+0xca3/0x2100 fs/f2fs/checkpoint.c:1658

kill_f2fs_super+0x231/0x390 fs/f2fs/super.c:4668

deactivate_locked_super+0x98/0x100 fs/super.c:332

deactivate_super+0xaf/0xe0 fs/super.c:363

cleanup_mnt+0x45f/0x4e0 fs/namespace.c:1186

__cleanup_mnt+0x19/0x20 fs/namespace.c:1193

task_work_run+0x1c6/0x230 kernel/task_work.c:203

exit_task_work include/linux/task_work.h:39 [inline]

do_exit+0x9fb/0x2410 kernel/exit.c:871

do_group_exit+0x210/0x2d0 kernel/exit.c:1021

__do_sys_exit_group kernel/exit.c:1032 [inline]

__se_sys_exit_group kernel/exit.c:1030 [inline]

__x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1030

x64_sys_call+0x7b4/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:232

do_syscall_x64 arch/x86/entry/common.c:51 [inline]

do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81

entry_SYSCALL_64_after_hwframe+0x68/0xd2

RIP: 0033:0x7f28b1b8e169

Code: Unable to access opcode bytes at 0x7f28b1b8e13f.

RSP: 002b:00007ffe174710a8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7

RAX: ffffffffffffffda RBX: 00007f28b1c10879 RCX: 00007f28b1b8e169

RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001

RBP: 0000000000000002 R08: 00007ffe1746ee47 R09: 00007ffe17472360

R10: 0000000000000009 R11: 0000000000000246 R12: 00007ffe17472360

R13: 00007f28b1c10854 R14: 000000000000dae5 R15: 00007ffe17474520

</TASK>

Allocated by task 569:

kasan_save_stack mm/kasan/common.c:45 [inline]

kasan_set_track+0x4b/0x70 mm/kasan/common.c:52

kasan_save_alloc_info+0x25/0x30 mm/kasan/generic.c:505

__kasan_slab_alloc+0x72/0x80 mm/kasan/common.c:328

kasan_slab_alloc include/linux/kasan.h:201 [inline]

slab_post_alloc_hook+0x4f/0x2c0 mm/slab.h:737

slab_alloc_node mm/slub.c:3398 [inline]

slab_alloc mm/slub.c:3406 [inline]

__kmem_cache_alloc_lru mm/slub.c:3413 [inline]

kmem_cache_alloc_lru+0x104/0x220 mm/slub.c:3429

alloc_inode_sb include/linux/fs.h:3245 [inline]

f2fs_alloc_inode+0x2d/0x340 fs/f2fs/super.c:1419

alloc_inode fs/inode.c:261 [inline]

iget_locked+0x186/0x880 fs/inode.c:1373

f2fs_iget+0x55/0x4c60 fs/f2fs/inode.c:483

f2fs_lookup+0x366/0xab0 fs/f2fs/namei.c:487

__lookup_slow+0x2a3/0x3d0 fs/namei.c:1690

lookup_slow+0x57/0x70 fs/namei.c:1707

walk_component+0x2e6/0x410 fs/namei

---truncated---