KASAN: use-after-free Read in reiserfs_find

Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KASAN: use-after-free Read in reiserfs_find_actor reiserfs				2	628d	724d	0/28	auto-obsoleted due to no activity on 2023/07/02 03:39
linux-6.1	KASAN: use-after-free Read in reiserfs_find_actor (2)				1	340d	340d	0/3	auto-obsoleted due to no activity on 2024/03/26 12:13
REISERFS (device loop0): Created .reiserfs_priv - reserved for xattr storage.
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BUG: KASAN: use-after-free in reiserfs_find_actor+0x104/0x124 fs/reiserfs/inode.c:1625
Read of size 4 at addr ffff00010b09b3e0 by task syz-executor.0/11137

CPU: 0 PID: 11137 Comm: syz-executor.0 Not tainted 6.1.35-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023
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:284 [inline]
 print_report+0x174/0x4c0 mm/kasan/report.c:395
 kasan_report+0xd4/0x130 mm/kasan/report.c:495
 __asan_report_load4_noabort+0x2c/0x38 mm/kasan/report_generic.c:350
 reiserfs_find_actor+0x104/0x124 fs/reiserfs/inode.c:1625
 find_inode+0x170/0x3b4 fs/inode.c:915
 inode_insert5+0xf8/0x418 fs/inode.c:1170
 insert_inode_locked4+0x68/0xa4 fs/inode.c:1680
 reiserfs_new_inode+0x428/0x1724 fs/reiserfs/inode.c:1960
 reiserfs_mkdir+0x4ac/0x77c fs/reiserfs/namei.c:845
 vfs_mkdir+0x334/0x4e4 fs/namei.c:4036
 do_mkdirat+0x20c/0x610 fs/namei.c:4061
 __do_sys_mkdirat fs/namei.c:4076 [inline]
 __se_sys_mkdirat fs/namei.c:4074 [inline]
 __arm64_sys_mkdirat+0x90/0xa8 fs/namei.c:4074
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:206
 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:581

Allocated by task 10427:
 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_slab_alloc+0x74/0x8c mm/kasan/common.c:328
 kasan_slab_alloc include/linux/kasan.h:201 [inline]
 slab_post_alloc_hook+0x74/0x458 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+0x1ac/0x2f8 mm/slub.c:3429
 alloc_inode_sb include/linux/fs.h:3131 [inline]
 f2fs_alloc_inode+0x12c/0x4a8 fs/f2fs/super.c:1366
 alloc_inode fs/inode.c:259 [inline]
 iget_locked+0x170/0x708 fs/inode.c:1286
 f2fs_iget+0x5c/0x4938 fs/f2fs/inode.c:497
 f2fs_fill_super+0x4ce0/0x6334 fs/f2fs/super.c:4333
 mount_bdev+0x274/0x370 fs/super.c:1423
 f2fs_mount+0x44/0x58 fs/f2fs/super.c:4580
 legacy_get_tree+0xd4/0x16c fs/fs_context.c:610
 vfs_get_tree+0x90/0x274 fs/super.c:1553
 do_new_mount+0x25c/0x8c4 fs/namespace.c:3040
 path_mount+0x590/0xe58 fs/namespace.c:3370
 do_mount fs/namespace.c:3383 [inline]
 __do_sys_mount fs/namespace.c:3591 [inline]
 __se_sys_mount fs/namespace.c:3568 [inline]
 __arm64_sys_mount+0x45c/0x594 fs/namespace.c:3568
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:206
 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:581

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:2799
 destroy_inode fs/inode.c:314 [inline]
 evict+0x5fc/0x68c fs/inode.c:679
 iput_final fs/inode.c:1747 [inline]
 iput+0x7c0/0x8a4 fs/inode.c:1773
 f2fs_fill_super+0x500c/0x6334 fs/f2fs/super.c:4516
 mount_bdev+0x274/0x370 fs/super.c:1423
 f2fs_mount+0x44/0x58 fs/f2fs/super.c:4580
 legacy_get_tree+0xd4/0x16c fs/fs_context.c:610
 vfs_get_tree+0x90/0x274 fs/super.c:1553
 do_new_mount+0x25c/0x8c4 fs/namespace.c:3040
 path_mount+0x590/0xe58 fs/namespace.c:3370
 do_mount fs/namespace.c:3383 [inline]
 __do_sys_mount fs/namespace.c:3591 [inline]
 __se_sys_mount fs/namespace.c:3568 [inline]
 __arm64_sys_mount+0x45c/0x594 fs/namespace.c:3568
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:206
 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:581

The buggy address belongs to the object at ffff00010b09ac88
 which belongs to the cache f2fs_inode_cache of size 2152
The buggy address is located 1880 bytes inside of
 2152-byte region [ffff00010b09ac88, ffff00010b09b4f0)

The buggy address belongs to the physical page:
page:000000000a22b701 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff00010b09f3c8 pfn:0x14b098
head:000000000a22b701 order:3 compound_mapcount:0 compound_pincount:0
memcg:ffff0000fff61401
flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000010200 0000000000000000 dead000000000001 ffff0000c756b680
raw: ffff00010b09f3c8 00000000800e0001 00000001ffffffff ffff0000fff61401
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff00010b09b280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff00010b09b300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff00010b09b380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                       ^
 ffff00010b09b400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff00010b09b480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc
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