KASAN: use-after-free Read in reiserfs_fill_super

Status: upstream: reported C repro on 2024/10/04 20:48
Bug presence: origin:upstream
Labels: missing-backport
[Documentation on labels]
Reported-by: syzbot+91666fc5ac3bf8b8ff8b@syzkaller.appspotmail.com
First crash: 670d, last: 14d
Fix bisection: failed (error log, bisect log)
  
▶ ▼ Bug presence (3)
Date Name Commit Repro Result
2024/12/15 linux-5.15.y (ToT) 963e654022cc C [report] KASAN: use-after-free Read in reiserfs_fill_super
2024/10/29 upstream (ToT) e42b1a9a2557 C [report] KASAN: use-after-free Read in reiserfs_fill_super
2024/12/15 upstream (ToT) dccbe2047a5b C Didn't crash
▶ ▼ Similar bugs (5)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KASAN: use-after-free Read in reiserfs_fill_super (3) fs 19 syz, C error done 47 625d 670d 28/29 fixed on 2025/01/13 19:22
linux-6.1 KASAN: use-after-free Read in reiserfs_fill_super origin:upstream missing-backport 19 syz, C inconclusive 11 24d 654d 0/3 upstream: reported C repro on 2024/10/20 14:12
upstream KASAN: use-after-free Read in reiserfs_fill_super fs 19 syz, C error done 2 2068d 2067d 19/29 fixed on 2021/03/10 01:48
upstream KASAN: use-after-free Read in reiserfs_fill_super (2) fs 19 1 1704d 1700d 0/29 auto-closed as invalid on 2022/02/03 07:30
linux-4.14 KASAN: use-after-free Read in reiserfs_fill_super 19 syz, C done 2 2038d 2038d 1/1 fixed on 2021/02/21 17:18
▶ ▼ Last patch testing requests (10)
Created Duration User Patch Repo Result
2026/07/22 07:02 18m retest repro linux-5.15.y report log
2026/07/22 07:02 18m retest repro linux-5.15.y report log
2026/05/12 19:39 2h05m retest repro linux-5.15.y report log
2026/05/07 15:23 12m retest repro linux-5.15.y error
2026/03/01 17:33 10m retest repro linux-5.15.y report log
2026/02/14 10:44 10m retest repro linux-5.15.y report log
2025/12/21 11:33 12m retest repro linux-5.15.y report log
2025/12/05 12:12 12m retest repro linux-5.15.y report log
2025/10/11 23:14 17m retest repro linux-5.15.y report log
2025/09/26 09:48 13m retest repro linux-5.15.y report log
▶ ▼ Fix bisection attempts (8)
Created Duration User Patch Repo Result
2026/05/20 04:10 15m fix candidate upstream error job log
2026/03/25 00:25 7m fix candidate upstream error job log
2026/02/22 23:32 2m fix candidate upstream error job log
2026/01/22 19:34 7m fix candidate upstream error job log
2025/12/21 18:36 1m fix candidate upstream error job log
2025/03/19 23:25 1m fix candidate upstream error job log
2025/01/18 11:28 1m fix candidate upstream error job log
2024/11/29 08:28 1m bisect fix linux-5.15.y error job log

Sample crash report:
REISERFS (device loop0): journal params: device ram0, size 127, journal first block 18, max trans len 1024, max batch 900, max commit age 30, max trans age 30
REISERFS (device loop0): checking transaction log (ram0)
==================================================================
BUG: KASAN: use-after-free in init_inode fs/reiserfs/inode.c:1325 [inline]
BUG: KASAN: use-after-free in reiserfs_read_locked_inode+0x17e8/0x1f54 fs/reiserfs/inode.c:1574
Read of size 4 at addr ffff0000de28d000 by task syz-executor146/4014

CPU: 0 PID: 4014 Comm: syz-executor146 Not tainted 5.15.167-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
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_load_n_noabort+0x40/0x4c mm/kasan/report_generic.c:319
 init_inode fs/reiserfs/inode.c:1325 [inline]
 reiserfs_read_locked_inode+0x17e8/0x1f54 fs/reiserfs/inode.c:1574
 reiserfs_fill_super+0x108c/0x1e8c fs/reiserfs/super.c:2075
 mount_bdev+0x274/0x370 fs/super.c:1398
 get_super_block+0x44/0x58 fs/reiserfs/super.c:2608
 legacy_get_tree+0xd4/0x16c fs/fs_context.c:611
 vfs_get_tree+0x90/0x274 fs/super.c:1528
 do_new_mount+0x278/0x8fc fs/namespace.c:3005
 path_mount+0x594/0x101c fs/namespace.c:3335
 do_mount fs/namespace.c:3348 [inline]
 __do_sys_mount fs/namespace.c:3556 [inline]
 __se_sys_mount fs/namespace.c:3533 [inline]
 __arm64_sys_mount+0x510/0x5e0 fs/namespace.c:3533
 __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 page:
page:000000008d321b26 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x11e28d
flags: 0x5ffc00000000000(node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000000000 fffffc000378a388 ffff0001b41a6520 0000000000000000
raw: 0000000000000001 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000de28cf00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff0000de28cf80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff0000de28d000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                   ^
 ffff0000de28d080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff0000de28d100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
REISERFS warning (device loop0): vs-13075 reiserfs_read_locked_inode: dead inode read from disk [1 2 0x0 SD]. This is likely to be race with knfsd. Ignore
REISERFS warning (device loop0):  reiserfs_fill_super: corrupt root inode, run fsck

Crashes (8):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/10/04 21:10 linux-5.15.y 3a5928702e71 d7906eff .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan-arm64 KASAN: use-after-free Read in reiserfs_fill_super
2024/10/04 21:00 linux-5.15.y 3a5928702e71 d7906eff .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan-arm64 KASAN: use-after-free Read in reiserfs_fill_super
2024/10/20 15:24 linux-5.15.y 584a40a22cb9 cd6fc0a3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan KASAN: use-after-free Read in reiserfs_fill_super
2024/10/20 15:24 linux-5.15.y 584a40a22cb9 cd6fc0a3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan KASAN: use-after-free Read in reiserfs_fill_super
2024/10/05 20:44 linux-5.15.y 3a5928702e71 d7906eff .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan KASAN: use-after-free Read in reiserfs_fill_super
2024/10/20 11:59 linux-5.15.y 584a40a22cb9 cd6fc0a3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 KASAN: use-after-free Read in reiserfs_fill_super
2024/10/04 20:48 linux-5.15.y 3a5928702e71 d7906eff .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 KASAN: use-after-free Read in reiserfs_fill_super
2024/10/05 20:42 linux-5.15.y 3a5928702e71 d7906eff .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan KASAN: out-of-bounds Read in reiserfs_fill_super
* Struck through repros no longer work on HEAD.