[v6.1] KASAN: use-after-free Read in ocfs2_get_next_id

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: c63962be84ef Linux 6.1.124
git tree: linux-6.1.y
console output: https://syzkaller.appspot.com/x/log.txt?x=14656bc4580000
kernel config: https://syzkaller.appspot.com/x/.config?x=2f99ac2134f3ff64
dashboard link: https://syzkaller.appspot.com/bug?extid=a14aec508f735d7e36eb
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
userspace arch: arm64

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

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/7ce6b92b931c/disk-c63962be.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/edbb3cdca2c4/vmlinux-c63962be.xz
kernel image: https://storage.googleapis.com/syzbot-assets/728732ee05ab/Image-c63962be.gz.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+a14aec...@syzkaller.appspotmail.com

ocfs2: Mounting device (7,7) on (node local, slot 0) with ordered data mode.
==================================================================
BUG: KASAN: use-after-free in ocfs2_lock_global_qf fs/ocfs2/quota_global.c:303 [inline]
BUG: KASAN: use-after-free in ocfs2_get_next_id+0x250/0x944 fs/ocfs2/quota_global.c:888
Read of size 8 at addr ffff00011020c028 by task syz.7.502/10186

CPU: 0 PID: 10186 Comm: syz.7.502 Not tainted 6.1.124-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call trace:
dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158
show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106
print_address_description mm/kasan/report.c:316 [inline]
print_report+0x174/0x4c0 mm/kasan/report.c:427
kasan_report+0xd4/0x130 mm/kasan/report.c:531
__asan_report_load8_noabort+0x2c/0x38 mm/kasan/report_generic.c:351
ocfs2_lock_global_qf fs/ocfs2/quota_global.c:303 [inline]
ocfs2_get_next_id+0x250/0x944 fs/ocfs2/quota_global.c:888
dquot_get_next_dqblk+0x7c/0x348 fs/quota/dquot.c:2717
quota_getnextquota+0x264/0x650 fs/quota/quota.c:250
do_quotactl+0x52c/0x698 fs/quota/quota.c:800
__do_sys_quotactl fs/quota/quota.c:960 [inline]
__se_sys_quotactl fs/quota/quota.c:916 [inline]
__arm64_sys_quotactl+0x2d8/0x7a0 fs/quota/quota.c:916
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637
el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585

Allocated by task 10186:
kasan_save_stack mm/kasan/common.c:45 [inline]
kasan_set_track+0x4c/0x80 mm/kasan/common.c:52
kasan_save_alloc_info+0x24/0x30 mm/kasan/generic.c:505
____kasan_kmalloc mm/kasan/common.c:374 [inline]
__kasan_kmalloc+0xac/0xc4 mm/kasan/common.c:383
kasan_kmalloc include/linux/kasan.h:211 [inline]
kmalloc_trace+0x7c/0x94 mm/slab_common.c:1031
kmalloc include/linux/slab.h:563 [inline]
ocfs2_local_read_info+0x1b8/0x15bc fs/ocfs2/quota_local.c:696
dquot_load_quota_sb+0x6f0/0xb1c fs/quota/dquot.c:2470
dquot_load_quota_inode+0x280/0x4f4 fs/quota/dquot.c:2507
ocfs2_enable_quotas+0x1d4/0x3cc fs/ocfs2/super.c:926
ocfs2_fill_super+0x3aa4/0x48c4 fs/ocfs2/super.c:1139
mount_bdev+0x274/0x370 fs/super.c:1443
ocfs2_mount+0x44/0x58 fs/ocfs2/super.c:1186
legacy_get_tree+0xd4/0x16c fs/fs_context.c:632
vfs_get_tree+0x90/0x274 fs/super.c:1573
do_new_mount+0x278/0x8fc fs/namespace.c:3056
path_mount+0x590/0xe5c fs/namespace.c:3386
do_mount fs/namespace.c:3399 [inline]
__do_sys_mount fs/namespace.c:3607 [inline]
__se_sys_mount fs/namespace.c:3584 [inline]
__arm64_sys_mount+0x45c/0x594 fs/namespace.c:3584
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637
el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585

Freed by task 10186:
kasan_save_stack mm/kasan/common.c:45 [inline]
kasan_set_track+0x4c/0x80 mm/kasan/common.c:52
kasan_save_free_info+0x38/0x5c mm/kasan/generic.c:516
____kasan_slab_free+0x144/0x1c0 mm/kasan/common.c:236
__kasan_slab_free+0x18/0x28 mm/kasan/common.c:244
kasan_slab_free include/linux/kasan.h:177 [inline]
slab_free_hook mm/slub.c:1724 [inline]
slab_free_freelist_hook mm/slub.c:1750 [inline]
slab_free mm/slub.c:3661 [inline]
__kmem_cache_free+0x2c0/0x4b4 mm/slub.c:3674
kfree+0xcc/0x1b8 mm/slab_common.c:988
ocfs2_local_free_info+0x720/0x8a4 fs/ocfs2/quota_local.c:869
dquot_disable+0xebc/0x17c0 fs/quota/dquot.c:2316
dquot_suspend include/linux/quotaops.h:85 [inline]
ocfs2_susp_quotas+0x1f0/0x2d4 fs/ocfs2/super.c:892
ocfs2_remount+0x464/0x9cc fs/ocfs2/super.c:647
legacy_reconfigure+0xfc/0x114 fs/fs_context.c:655
reconfigure_super+0x318/0x7a4 fs/super.c:977
do_remount fs/namespace.c:2712 [inline]
path_mount+0xc70/0xe5c fs/namespace.c:3378
do_mount fs/namespace.c:3399 [inline]
__do_sys_mount fs/namespace.c:3607 [inline]
__se_sys_mount fs/namespace.c:3584 [inline]
__arm64_sys_mount+0x45c/0x594 fs/namespace.c:3584
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637
el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585

Last potentially related work creation:
kasan_save_stack+0x40/0x70 mm/kasan/common.c:45
__kasan_record_aux_stack+0xcc/0xe8 mm/kasan/generic.c:486
kasan_record_aux_stack_noalloc+0x14/0x20 mm/kasan/generic.c:496
call_rcu+0xfc/0xa40 kernel/rcu/tree.c:2845
__qdisc_destroy+0x2b0/0x558 net/sched/sch_generic.c:1084
qdisc_put net/sched/sch_generic.c:1104 [inline]
dev_shutdown+0x360/0x480 net/sched/sch_generic.c:1492
unregister_netdevice_many+0x934/0x175c net/core/dev.c:10938
default_device_exit_batch+0x9f4/0xa70 net/core/dev.c:11460
ops_exit_list net/core/net_namespace.c:177 [inline]
cleanup_net+0x5dc/0xa18 net/core/net_namespace.c:621
process_one_work+0x7ac/0x1404 kernel/workqueue.c:2292
worker_thread+0x8e4/0xfec kernel/workqueue.c:2439
kthread+0x250/0x2d8 kernel/kthread.c:376
ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:864

The buggy address belongs to the object at ffff00011020c000
which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 40 bytes inside of
1024-byte region [ffff00011020c000, ffff00011020c400)

The buggy address belongs to the physical page:
page:0000000097b987fa refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x150208
head:0000000097b987fa order:3 compound_mapcount:0 compound_pincount:0
flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000010200 dead000000000100 dead000000000122 ffff0000c0002780
raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
ffff00011020bf00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff00011020bf80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff00011020c000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff00011020c080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff00011020c100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================


---
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[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 4735586da88e Linux 5.15.176
git tree: linux-5.15.y
console output: https://syzkaller.appspot.com/x/log.txt?x=175becb0580000
kernel config: https://syzkaller.appspot.com/x/.config?x=caf0c22a63c5c861
dashboard link: https://syzkaller.appspot.com/bug?extid=7bbc287dbb8308afda1e

compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
userspace arch: arm64

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

Downloadable assets:

disk image: https://storage.googleapis.com/syzbot-assets/3e7a2d136136/disk-4735586d.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/7597375cf469/vmlinux-4735586d.xz
kernel image: https://storage.googleapis.com/syzbot-assets/132474c9ad82/Image-4735586d.gz.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:

Reported-by: syzbot+7bbc28...@syzkaller.appspotmail.com

==================================================================
BUG: KASAN: use-after-free in ocfs2_lock_global_qf fs/ocfs2/quota_global.c:303 [inline]

BUG: KASAN: use-after-free in ocfs2_get_next_id+0x22c/0x8ac fs/ocfs2/quota_global.c:888
Read of size 8 at addr ffff0000c7b14828 by task syz.2.286/4930

CPU: 0 PID: 4930 Comm: syz.2.286 Not tainted 5.15.176-syzkaller #0

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
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
ocfs2_lock_global_qf fs/ocfs2/quota_global.c:303 [inline]
ocfs2_get_next_id+0x22c/0x8ac fs/ocfs2/quota_global.c:888
dquot_get_next_dqblk+0x7c/0x348 fs/quota/dquot.c:2710
quota_getnextquota+0x264/0x674 fs/quota/quota.c:249
do_quotactl+0x52c/0x698 fs/quota/quota.c:799
__do_sys_quotactl fs/quota/quota.c:959 [inline]
__se_sys_quotactl fs/quota/quota.c:915 [inline]
__arm64_sys_quotactl+0x2d8/0x7a4 fs/quota/quota.c:915
__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:608
el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626
el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584

Allocated by task 4930:
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_kmalloc+0xbc/0xfc mm/kasan/common.c:513
__kasan_kmalloc+0x10/0x1c mm/kasan/common.c:522
kasan_kmalloc include/linux/kasan.h:264 [inline]
kmem_cache_alloc_trace+0x27c/0x47c mm/slub.c:3247
kmalloc include/linux/slab.h:591 [inline]
ocfs2_local_read_info+0x1b8/0x15bc fs/ocfs2/quota_local.c:696
dquot_load_quota_sb+0x6f0/0xb1c fs/quota/dquot.c:2463
dquot_load_quota_inode+0x280/0x4f4 fs/quota/dquot.c:2500
ocfs2_enable_quotas+0x1d4/0x3cc fs/ocfs2/super.c:927
ocfs2_fill_super+0x37bc/0x4abc fs/ocfs2/super.c:1140
mount_bdev+0x274/0x370 fs/super.c:1400
ocfs2_mount+0x44/0x58 fs/ocfs2/super.c:1187
legacy_get_tree+0xd4/0x16c fs/fs_context.c:611
vfs_get_tree+0x90/0x274 fs/super.c:1530
do_new_mount+0x278/0x8fc fs/namespace.c:3012
path_mount+0x594/0x101c fs/namespace.c:3342
do_mount fs/namespace.c:3355 [inline]
__do_sys_mount fs/namespace.c:3563 [inline]
__se_sys_mount fs/namespace.c:3540 [inline]
__arm64_sys_mount+0x510/0x5e0 fs/namespace.c:3540
__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:608
el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626
el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584

Freed by task 4930:
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track+0x4c/0x84 mm/kasan/common.c:46
kasan_set_free_info+0x28/0x4c mm/kasan/generic.c:360
____kasan_slab_free+0x118/0x164 mm/kasan/common.c:366
__kasan_slab_free+0x18/0x28 mm/kasan/common.c:374
kasan_slab_free include/linux/kasan.h:230 [inline]
slab_free_hook mm/slub.c:1705 [inline]
slab_free_freelist_hook+0x128/0x1ec mm/slub.c:1731
slab_free mm/slub.c:3499 [inline]
kfree+0x178/0x410 mm/slub.c:4559
ocfs2_local_free_info+0x720/0x8a4 fs/ocfs2/quota_local.c:869
dquot_disable+0xefc/0x1800 fs/quota/dquot.c:2309
dquot_suspend include/linux/quotaops.h:84 [inline]
ocfs2_susp_quotas+0x1f0/0x2d4 fs/ocfs2/super.c:893
ocfs2_remount+0x464/0x9cc fs/ocfs2/super.c:648
legacy_reconfigure+0xfc/0x114 fs/fs_context.c:634
reconfigure_super+0x1d0/0x6ec fs/super.c:938
do_remount fs/namespace.c:2668 [inline]
path_mount+0xbec/0x101c fs/namespace.c:3334
do_mount fs/namespace.c:3355 [inline]
__do_sys_mount fs/namespace.c:3563 [inline]
__se_sys_mount fs/namespace.c:3540 [inline]
__arm64_sys_mount+0x510/0x5e0 fs/namespace.c:3540
__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:608
el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626
el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584

The buggy address belongs to the object at ffff0000c7b14800

which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 40 bytes inside of

1024-byte region [ffff0000c7b14800, ffff0000c7b14c00)
The buggy address belongs to the page:
page:00000000a9804054 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x107b10
head:00000000a9804054 order:3 compound_mapcount:0 compound_pincount:0

flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff)

raw: 05ffc00000010200 fffffc0003a3d600 0000000600000006 ffff0000c0002780
raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000

page dumped because: kasan: bad access detected

Memory state around the buggy address:

ffff0000c7b14700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff0000c7b14780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff0000c7b14800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff0000c7b14880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff0000c7b14900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb

[syzbot]

syzbot has found a reproducer for the following issue on:

HEAD commit: c63962be84ef Linux 6.1.124
git tree: linux-6.1.y

console output: https://syzkaller.appspot.com/x/log.txt?x=170d6bc4580000

kernel config: https://syzkaller.appspot.com/x/.config?x=2f99ac2134f3ff64
dashboard link: https://syzkaller.appspot.com/bug?extid=a14aec508f735d7e36eb
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
userspace arch: arm64

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1734b1df980000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=129e8a18580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/7ce6b92b931c/disk-c63962be.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/edbb3cdca2c4/vmlinux-c63962be.xz
kernel image: https://storage.googleapis.com/syzbot-assets/728732ee05ab/Image-c63962be.gz.xz

mounted in repro: https://storage.googleapis.com/syzbot-assets/d2861eefed7b/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+a14aec...@syzkaller.appspotmail.com

JBD2: Ignoring recovery information on journal
ocfs2: Mounting device (7,0) on (node local, slot 0) with ordered data mode.

==================================================================
BUG: KASAN: use-after-free in ocfs2_lock_global_qf fs/ocfs2/quota_global.c:303 [inline]
BUG: KASAN: use-after-free in ocfs2_get_next_id+0x250/0x944 fs/ocfs2/quota_global.c:888

Read of size 8 at addr ffff0000d0fc0028 by task syz-executor214/4290

CPU: 0 PID: 4290 Comm: syz-executor214 Not tainted 6.1.124-syzkaller #0

Allocated by task 4290:

Freed by task 4290:

The buggy address belongs to the object at ffff0000d0fc0000

which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 40 bytes inside of

1024-byte region [ffff0000d0fc0000, ffff0000d0fc0400)

The buggy address belongs to the physical page:

page:00000000264f5995 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x110fc0
head:00000000264f5995 order:3 compound_mapcount:0 compound_pincount:0

flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff)

raw: 05ffc00000010200 fffffc00031bfa00 dead000000000002 ffff0000c0002780

raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:

ffff0000d0fbff00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff0000d0fbff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff0000d0fc0000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff0000d0fc0080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff0000d0fc0100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================


---
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.

[syzbot]

syzbot has found a reproducer for the following issue on:

HEAD commit: 4735586da88e Linux 5.15.176
git tree: linux-5.15.y

console output: https://syzkaller.appspot.com/x/log.txt?x=11f4b1df980000

kernel config: https://syzkaller.appspot.com/x/.config?x=caf0c22a63c5c861
dashboard link: https://syzkaller.appspot.com/bug?extid=7bbc287dbb8308afda1e
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
userspace arch: arm64

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15de8a18580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1227ecb0580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/3e7a2d136136/disk-4735586d.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/7597375cf469/vmlinux-4735586d.xz
kernel image: https://storage.googleapis.com/syzbot-assets/132474c9ad82/Image-4735586d.gz.xz

mounted in repro: https://storage.googleapis.com/syzbot-assets/09795614bac3/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+7bbc28...@syzkaller.appspotmail.com

JBD2: Ignoring recovery information on journal
ocfs2: Mounting device (7,0) on (node local, slot 0) with ordered data mode.

==================================================================
BUG: KASAN: use-after-free in ocfs2_lock_global_qf fs/ocfs2/quota_global.c:303 [inline]
BUG: KASAN: use-after-free in ocfs2_get_next_id+0x22c/0x8ac fs/ocfs2/quota_global.c:888

Read of size 8 at addr ffff0000da812028 by task syz-executor221/4018

CPU: 1 PID: 4018 Comm: syz-executor221 Not tainted 5.15.176-syzkaller #0

Allocated by task 4018:

Freed by task 4018:

The buggy address belongs to the object at ffff0000da812000

which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 40 bytes inside of

1024-byte region [ffff0000da812000, ffff0000da812400)

The buggy address belongs to the page:

page:00000000f3d2e6f3 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11a810
head:00000000f3d2e6f3 order:3 compound_mapcount:0 compound_pincount:0

flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff)

raw: 05ffc00000010200 fffffc0003426e00 0000000200000002 ffff0000c0002780

raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:

ffff0000da811f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff0000da811f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff0000da812000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff0000da812080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff0000da812100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================


---

[syzbot]

syzbot suspects this issue was fixed by commit:

commit 2d431192486367eee03cc28d0b53b97dafcb8e63
Author: Dennis Lam <dennis....@gmail.com>
Date: Wed Dec 18 02:39:25 2024 +0000

ocfs2: fix slab-use-after-free due to dangling pointer dqi_priv

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=143e19a4580000
start commit: c63962be84ef Linux 6.1.124
git tree: linux-6.1.y

kernel config: https://syzkaller.appspot.com/x/.config?x=2f99ac2134f3ff64
dashboard link: https://syzkaller.appspot.com/bug?extid=a14aec508f735d7e36eb

userspace arch: arm64
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1596b1df980000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1186bef8580000

If the result looks correct, please mark the issue as fixed by replying with:

#syz fix: ocfs2: fix slab-use-after-free due to dangling pointer dqi_priv

For information about bisection process see: https://goo.gl/tpsmEJ#bisection

[syzbot]

Auto-closing this bug as obsolete.
No recent activity, existing reproducers are no longer triggering the issue.