KASAN: use-after-free Read in xfs_inode_item

Kernel	Title	Repro	Cause bisect	Count	Last	Reported	Patched	Status
linux-6.1	KASAN: use-after-free Read in xfs_inode_item_push (2)			1	153d	153d	0/3	auto-obsoleted due to no activity on 2024/12/14 11:37
upstream	KASAN: use-after-free Read in xfs_inode_item_push xfs			16	500d	726d	0/28	auto-obsoleted due to no activity on 2024/01/02 00:00
linux-6.1	KASAN: use-after-free Read in xfs_inode_item_push			1	648d	648d	0/3	auto-obsoleted due to no activity on 2023/08/23 09:03
linux-5.15	KASAN: use-after-free Read in xfs_inode_item_push			2	627d	630d	0/3	auto-obsoleted due to no activity on 2023/08/28 08:02
upstream	KASAN: slab-use-after-free Read in xfs_inode_item_push xfs	C	error	179	19h55m	301d	0/28	upstream: reported C repro on 2024/04/10 12:45

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BUG: KASAN: use-after-free in xfs_inode_item_push+0x228/0x28c fs/xfs/xfs_inode_item.c:582
Read of size 8 at addr ffff0000e868d530 by task xfsaild/loop9/9082

CPU: 0 PID: 9082 Comm: xfsaild/loop9 Not tainted 5.15.177-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
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
 xfs_inode_item_push+0x228/0x28c fs/xfs/xfs_inode_item.c:582
 xfsaild_push_item fs/xfs/xfs_trans_ail.c:414 [inline]
 xfsaild_push fs/xfs/xfs_trans_ail.c:472 [inline]
 xfsaild+0xb58/0x2bfc fs/xfs/xfs_trans_ail.c:657
 kthread+0x37c/0x45c kernel/kthread.c:334
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:870

Allocated by task 9011:
 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
 kmem_cache_zalloc include/linux/slab.h:711 [inline]
 xfs_inode_item_init+0x3c/0xc0 fs/xfs/xfs_inode_item.c:675
 xfs_trans_ijoin+0xc4/0xe8 fs/xfs/libxfs/xfs_trans_inode.c:36
 xfs_setattr_size+0x4a8/0xc00 fs/xfs/xfs_iops.c:911
 xfs_vn_setattr_size+0x1cc/0x3d8 fs/xfs/xfs_iops.c:997
 xfs_vn_setattr+0x1c0/0x524 fs/xfs/xfs_iops.c:1022
 notify_change+0xa34/0xcf8 fs/attr.c:505
 do_truncate+0x1c0/0x28c fs/open.c:65
 handle_truncate fs/namei.c:3265 [inline]
 do_open fs/namei.c:3612 [inline]
 path_openat+0x20c4/0x26cc fs/namei.c:3742
 do_filp_open+0x1a8/0x3b4 fs/namei.c:3769
 do_sys_openat2+0x128/0x3e0 fs/open.c:1253
 do_sys_open fs/open.c:1269 [inline]
 __do_sys_openat fs/open.c:1285 [inline]
 __se_sys_openat fs/open.c:1280 [inline]
 __arm64_sys_openat+0x1f0/0x240 fs/open.c:1280
 __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 14:
 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]
 kmem_cache_free+0xdc/0x3c4 mm/slub.c:3515
 xfs_inode_item_destroy+0x80/0x94 fs/xfs/xfs_inode_item.c:697
 xfs_inode_free_callback+0x1c4/0x240 fs/xfs/xfs_icache.c:142
 rcu_do_batch kernel/rcu/tree.c:2523 [inline]
 rcu_core+0x830/0x1b34 kernel/rcu/tree.c:2763
 rcu_core_si+0x10/0x1c kernel/rcu/tree.c:2776
 handle_softirqs+0x384/0xdbc kernel/softirq.c:558
 run_ksoftirqd+0x6c/0x29c kernel/softirq.c:925
 smpboot_thread_fn+0x4b0/0x920 kernel/smpboot.c:164
 kthread+0x37c/0x45c kernel/kthread.c:334
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:870

The buggy address belongs to the object at ffff0000e868d500
 which belongs to the cache xfs_ili of size 256
The buggy address is located 48 bytes inside of
 256-byte region [ffff0000e868d500, ffff0000e868d600)
The buggy address belongs to the page:
page:00000000c1da97a7 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x12868d
flags: 0x5ffc00000000200(slab|node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000000200 0000000000000000 dead000000000122 ffff0000c68cd380
raw: 0000000000000000 00000000800c000c 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000e868d400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff0000e868d480: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
>ffff0000e868d500: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                     ^
 ffff0000e868d580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff0000e868d600: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
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