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	428d	524d	0/26	auto-obsoleted due to no activity on 2023/07/02 03:39
linux-6.1	KASAN: use-after-free Read in reiserfs_find_actor				1	314d	314d	0/3	auto-obsoleted due to no activity on 2023/10/04 16:11
==================================================================
BUG: KASAN: use-after-free in reiserfs_find_actor+0xe5/0x100 fs/reiserfs/inode.c:1625
Read of size 4 at addr ffff88809e320758 by task syz-executor.2/19736

CPU: 0 PID: 19736 Comm: syz-executor.2 Not tainted 6.1.68-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:284 [inline]
 print_report+0x15f/0x4f0 mm/kasan/report.c:395
 kasan_report+0x136/0x160 mm/kasan/report.c:495
 reiserfs_find_actor+0xe5/0x100 fs/reiserfs/inode.c:1625
 find_inode+0x16b/0x430 fs/inode.c:915
 inode_insert5+0xf3/0x500 fs/inode.c:1212
 insert_inode_locked4+0x5a/0x90 fs/inode.c:1722
 reiserfs_new_inode+0x5d0/0x1d90 fs/reiserfs/inode.c:1960
 reiserfs_create+0x3e3/0x6e0 fs/reiserfs/namei.c:668
 lookup_open fs/namei.c:3414 [inline]
 open_last_lookups fs/namei.c:3482 [inline]
 path_openat+0x12f1/0x2e60 fs/namei.c:3712
 do_filp_open+0x230/0x480 fs/namei.c:3742
 do_sys_openat2+0x13b/0x500 fs/open.c:1318
 do_sys_open fs/open.c:1334 [inline]
 __do_sys_openat fs/open.c:1350 [inline]
 __se_sys_openat fs/open.c:1345 [inline]
 __x64_sys_openat+0x243/0x290 fs/open.c:1345
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fabb2e7cba9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fabb3bd80c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007fabb2f9bf80 RCX: 00007fabb2e7cba9
RDX: 000000000000275a RSI: 0000000020000000 RDI: ffffffffffffff9c
RBP: 00007fabb2ec847a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007fabb2f9bf80 R15: 00007ffc326ffd98
 </TASK>

Allocated by task 25140:
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:52
 __kasan_slab_alloc+0x65/0x70 mm/kasan/common.c:328
 kasan_slab_alloc include/linux/kasan.h:201 [inline]
 slab_post_alloc_hook+0x52/0x3a0 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+0x10c/0x2d0 mm/slub.c:3429
 alloc_inode_sb include/linux/fs.h:3176 [inline]
 f2fs_alloc_inode+0x171/0x540 fs/f2fs/super.c:1398
 alloc_inode fs/inode.c:259 [inline]
 new_inode_pseudo+0x61/0x1d0 fs/inode.c:1018
 new_inode+0x25/0x1d0 fs/inode.c:1046
 f2fs_new_inode+0x11d/0x1020 fs/f2fs/namei.c:191
 f2fs_create+0x18e/0xa10 fs/f2fs/namei.c:354
 lookup_open fs/namei.c:3414 [inline]
 open_last_lookups fs/namei.c:3482 [inline]
 path_openat+0x12f1/0x2e60 fs/namei.c:3712
 do_filp_open+0x230/0x480 fs/namei.c:3742
 do_sys_openat2+0x13b/0x500 fs/open.c:1318
 do_sys_open fs/open.c:1334 [inline]
 __do_sys_open fs/open.c:1342 [inline]
 __se_sys_open fs/open.c:1338 [inline]
 __x64_sys_open+0x221/0x270 fs/open.c:1338
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Last potentially related work creation:
 kasan_save_stack+0x3b/0x60 mm/kasan/common.c:45
 __kasan_record_aux_stack+0xb0/0xc0 mm/kasan/generic.c:486
 call_rcu+0x163/0xa10 kernel/rcu/tree.c:2812
 dispose_list fs/inode.c:697 [inline]
 evict_inodes+0x601/0x6a0 fs/inode.c:747
 generic_shutdown_super+0x94/0x340 fs/super.c:480
 kill_block_super+0x7a/0xe0 fs/super.c:1459
 kill_f2fs_super+0x2ff/0x3c0 fs/f2fs/super.c:4644
 deactivate_locked_super+0xa0/0x110 fs/super.c:332
 cleanup_mnt+0x490/0x520 fs/namespace.c:1186
 task_work_run+0x246/0x300 kernel/task_work.c:179
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop+0xde/0x100 kernel/entry/common.c:171
 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:204
 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline]
 syscall_exit_to_user_mode+0x60/0x270 kernel/entry/common.c:297
 do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:87
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Second to last potentially related work creation:
 kasan_save_stack+0x3b/0x60 mm/kasan/common.c:45
 __kasan_record_aux_stack+0xb0/0xc0 mm/kasan/generic.c:486
 call_rcu+0x163/0xa10 kernel/rcu/tree.c:2812
 f2fs_put_super+0x61c/0xc00 fs/f2fs/super.c:1626
 generic_shutdown_super+0x130/0x340 fs/super.c:501
 kill_block_super+0x7a/0xe0 fs/super.c:1459
 kill_f2fs_super+0x2ff/0x3c0 fs/f2fs/super.c:4644
 deactivate_locked_super+0xa0/0x110 fs/super.c:332
 cleanup_mnt+0x490/0x520 fs/namespace.c:1186
 task_work_run+0x246/0x300 kernel/task_work.c:179
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop+0xde/0x100 kernel/entry/common.c:171
 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:204
 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline]
 syscall_exit_to_user_mode+0x60/0x270 kernel/entry/common.c:297
 do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:87
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

The buggy address belongs to the object at ffff88809e320000
 which belongs to the cache f2fs_inode_cache of size 2152
The buggy address is located 1880 bytes inside of
 2152-byte region [ffff88809e320000, ffff88809e320868)

The buggy address belongs to the physical page:
page:ffffea000278c800 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88809e323e58 pfn:0x9e320
head:ffffea000278c800 order:3 compound_mapcount:0 compound_pincount:0
memcg:ffff88807570cc01
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 0000000000000000 dead000000000001 ffff888016b06280
raw: ffff88809e323e58 00000000800e0001 00000001ffffffff ffff88807570cc01
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Reclaimable, gfp_mask 0x1d2050(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL|__GFP_RECLAIMABLE), pid 5598, tgid 5594 (syz-executor.5), ts 307644696476, free_ts 307085159001
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x18d/0x1b0 mm/page_alloc.c:2513
 prep_new_page mm/page_alloc.c:2520 [inline]
 get_page_from_freelist+0x31a1/0x3320 mm/page_alloc.c:4279
 __alloc_pages+0x28d/0x770 mm/page_alloc.c:5545
 alloc_slab_page+0x6a/0x150 mm/slub.c:1794
 allocate_slab mm/slub.c:1939 [inline]
 new_slab+0x84/0x2d0 mm/slub.c:1992
 ___slab_alloc+0xc20/0x1270 mm/slub.c:3180
 __slab_alloc mm/slub.c:3279 [inline]
 slab_alloc_node mm/slub.c:3364 [inline]
 slab_alloc mm/slub.c:3406 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3413 [inline]
 kmem_cache_alloc_lru+0x1a5/0x2d0 mm/slub.c:3429
 alloc_inode_sb include/linux/fs.h:3176 [inline]
 f2fs_alloc_inode+0x171/0x540 fs/f2fs/super.c:1398
 alloc_inode fs/inode.c:259 [inline]
 iget_locked+0x1c8/0x830 fs/inode.c:1328
 f2fs_iget+0x52/0x49e0 fs/f2fs/inode.c:497
 f2fs_fill_super+0x4ab4/0x7cb0 fs/f2fs/super.c:4263
 mount_bdev+0x2c9/0x3f0 fs/super.c:1432
 legacy_get_tree+0xeb/0x180 fs/fs_context.c:632
 vfs_get_tree+0x88/0x270 fs/super.c:1562
 do_new_mount+0x28b/0xae0 fs/namespace.c:3040
 do_mount fs/namespace.c:3383 [inline]
 __do_sys_mount fs/namespace.c:3591 [inline]
 __se_sys_mount+0x2d5/0x3c0 fs/namespace.c:3568
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1440 [inline]
 free_pcp_prepare mm/page_alloc.c:1490 [inline]
 free_unref_page_prepare+0xf63/0x1120 mm/page_alloc.c:3358
 free_unref_page+0x33/0x3e0 mm/page_alloc.c:3453
 qlink_free mm/kasan/quarantine.c:168 [inline]
 qlist_free_all+0x76/0xe0 mm/kasan/quarantine.c:187
 kasan_quarantine_reduce+0x156/0x170 mm/kasan/quarantine.c:294
 __kasan_slab_alloc+0x1f/0x70 mm/kasan/common.c:305
 kasan_slab_alloc include/linux/kasan.h:201 [inline]
 slab_post_alloc_hook+0x52/0x3a0 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+0x10c/0x2d0 mm/slub.c:3422
 kmem_cache_zalloc include/linux/slab.h:679 [inline]
 __kernfs_new_node+0xd4/0x870 fs/kernfs/dir.c:608
 kernfs_new_node fs/kernfs/dir.c:672 [inline]
 kernfs_create_dir_ns+0x90/0x230 fs/kernfs/dir.c:1023
 sysfs_create_dir_ns+0x185/0x390 fs/sysfs/dir.c:59
 create_dir lib/kobject.c:63 [inline]
 kobject_add_internal+0x6df/0xd10 lib/kobject.c:231
 kobject_add_varg lib/kobject.c:366 [inline]
 kobject_init_and_add+0x120/0x190 lib/kobject.c:449
 br_add_if+0x38c/0xed0 net/bridge/br_if.c:613
 do_set_master net/core/rtnetlink.c:2598 [inline]
 rtnl_newlink_create net/core/rtnetlink.c:3407 [inline]
 __rtnl_newlink net/core/rtnetlink.c:3610 [inline]
 rtnl_newlink+0x1d1f/0x2050 net/core/rtnetlink.c:3623
 rtnetlink_rcv_msg+0x818/0xff0 net/core/rtnetlink.c:6122
 netlink_rcv_skb+0x1cd/0x410 net/netlink/af_netlink.c:2508

Memory state around the buggy address:
 ffff88809e320600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88809e320680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88809e320700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                    ^
 ffff88809e320780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88809e320800: fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc
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