[v5.15] KASAN: slab-out-of-bounds Read in ext4_enable_quotas

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 4fdad925aa1a Linux 5.15.107
git tree: linux-5.15.y
console output: https://syzkaller.appspot.com/x/log.txt?x=152baeebc80000
kernel config: https://syzkaller.appspot.com/x/.config?x=d67d6c9042bf5bb9
dashboard link: https://syzkaller.appspot.com/bug?extid=edc7f40ba8a70e298ad1
compiler: Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2
userspace arch: arm64

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/a4ecac695096/disk-4fdad925.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/3362687e1660/vmlinux-4fdad925.xz
kernel image: https://storage.googleapis.com/syzbot-assets/3e588c974210/Image-4fdad925.gz.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+edc7f4...@syzkaller.appspotmail.com

==================================================================
BUG: KASAN: slab-out-of-bounds in lockdep_set_quota_inode fs/ext4/super.c:6231 [inline]
BUG: KASAN: slab-out-of-bounds in ext4_quota_enable fs/ext4/super.c:6362 [inline]
BUG: KASAN: slab-out-of-bounds in ext4_enable_quotas+0x4b4/0xab4 fs/ext4/super.c:6389
Read of size 8 at addr ffff0000dfa9af58 by task syz-executor.5/30820

CPU: 0 PID: 30820 Comm: syz-executor.5 Not tainted 5.15.107-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023
Call trace:
dump_backtrace+0x0/0x530 arch/arm64/kernel/stacktrace.c:152
show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106
print_address_description+0x7c/0x3f0 mm/kasan/report.c:248
__kasan_report mm/kasan/report.c:434 [inline]
kasan_report+0x174/0x1e4 mm/kasan/report.c:451
__asan_report_load8_noabort+0x44/0x50 mm/kasan/report_generic.c:309
lockdep_set_quota_inode fs/ext4/super.c:6231 [inline]
ext4_quota_enable fs/ext4/super.c:6362 [inline]
ext4_enable_quotas+0x4b4/0xab4 fs/ext4/super.c:6389
ext4_fill_super+0x7c94/0x868c fs/ext4/super.c:4949
mount_bdev+0x26c/0x368 fs/super.c:1378
ext4_mount+0x44/0x58 fs/ext4/super.c:6568
legacy_get_tree+0xd4/0x16c fs/fs_context.c:610
vfs_get_tree+0x90/0x274 fs/super.c:1508
do_new_mount+0x25c/0x8c8 fs/namespace.c:2994
path_mount+0x590/0x104c fs/namespace.c:3324
do_mount fs/namespace.c:3337 [inline]
__do_sys_mount fs/namespace.c:3545 [inline]
__se_sys_mount fs/namespace.c:3522 [inline]
__arm64_sys_mount+0x510/0x5e0 fs/namespace.c:3522
__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+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:596
el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:614
el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584

Allocated by task 14131:
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+0x8c/0xcc mm/kasan/common.c:467
kasan_slab_alloc include/linux/kasan.h:254 [inline]
slab_post_alloc_hook+0x74/0x3f4 mm/slab.h:519
slab_alloc_node mm/slub.c:3220 [inline]
slab_alloc mm/slub.c:3228 [inline]
kmem_cache_alloc+0x1dc/0x45c mm/slub.c:3233
f2fs_kmem_cache_alloc fs/f2fs/f2fs.h:2644 [inline]
f2fs_alloc_inode+0x138/0x5d8 fs/f2fs/super.c:1350
alloc_inode fs/inode.c:236 [inline]
iget_locked+0x180/0x720 fs/inode.c:1202
f2fs_iget+0x5c/0x53b8 fs/f2fs/inode.c:489
f2fs_fill_super+0x5058/0x6520 fs/f2fs/super.c:4231
mount_bdev+0x26c/0x368 fs/super.c:1378
f2fs_mount+0x44/0x58 fs/f2fs/super.c:4478
legacy_get_tree+0xd4/0x16c fs/fs_context.c:610
vfs_get_tree+0x90/0x274 fs/super.c:1508
do_new_mount+0x25c/0x8c8 fs/namespace.c:2994
path_mount+0x590/0x104c fs/namespace.c:3324
do_mount fs/namespace.c:3337 [inline]
__do_sys_mount fs/namespace.c:3545 [inline]
__se_sys_mount fs/namespace.c:3522 [inline]
__arm64_sys_mount+0x510/0x5e0 fs/namespace.c:3522
__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+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:596
el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:614
el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584

Last potentially related work creation:
kasan_save_stack+0x38/0x68 mm/kasan/common.c:38
kasan_record_aux_stack+0xd4/0x11c mm/kasan/generic.c:348
__call_rcu kernel/rcu/tree.c:2993 [inline]
call_rcu+0x118/0xb40 kernel/rcu/tree.c:3073
destroy_inode fs/inode.c:291 [inline]
evict+0x5fc/0x68c fs/inode.c:602
iput_final fs/inode.c:1663 [inline]
iput+0x744/0x824 fs/inode.c:1689
f2fs_fill_super+0x5410/0x6520 fs/f2fs/super.c:4414
mount_bdev+0x26c/0x368 fs/super.c:1378
f2fs_mount+0x44/0x58 fs/f2fs/super.c:4478
legacy_get_tree+0xd4/0x16c fs/fs_context.c:610
vfs_get_tree+0x90/0x274 fs/super.c:1508
do_new_mount+0x25c/0x8c8 fs/namespace.c:2994
path_mount+0x590/0x104c fs/namespace.c:3324
do_mount fs/namespace.c:3337 [inline]
__do_sys_mount fs/namespace.c:3545 [inline]
__se_sys_mount fs/namespace.c:3522 [inline]
__arm64_sys_mount+0x510/0x5e0 fs/namespace.c:3522
__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+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:596
el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:614
el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584

The buggy address belongs to the object at ffff0000dfa9a600
which belongs to the cache f2fs_inode_cache of size 2304
The buggy address is located 88 bytes to the right of
2304-byte region [ffff0000dfa9a600, ffff0000dfa9af00)
The buggy address belongs to the page:
page:000000007b65bcb7 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff0000dfa9d580 pfn:0x11fa98
head:000000007b65bcb7 order:3 compound_mapcount:0 compound_pincount:0
memcg:ffff0000d3e6fd01
flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000010200 0000000000000000 dead000000000122 ffff0000c65f1b00
raw: ffff0000dfa9d580 00000000800d0006 00000001ffffffff ffff0000d3e6fd01
page dumped because: kasan: bad access detected

Memory state around the buggy address:
ffff0000dfa9ae00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff0000dfa9ae80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff0000dfa9af00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
^
ffff0000dfa9af80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff0000dfa9b000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
EXT4-fs warning (device loop5): ext4_enable_quotas:6397: Failed to enable quota tracking (type=0, err=-13, ino=3). Please run e2fsck to fix.
EXT4-fs (loop5): mount failed


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[syzbot]

Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.