From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-il1-f208.google.com (mail-il1-f208.google.com [209.85.166.208]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0B14827381E for ; Wed, 24 Sep 2025 22:04:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.208 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758751471; cv=none; b=RUjwc9FA2FNDZK3KPflNKoweRQAyd/yUsdIuEc+up0Ww6I4cc20KCJ5mhemxiQQm2rvhIB5DY3t9dEGR+uPZCm3iO8MjlYqdxl9ywYkIgoHlwnl23hGLIrxhwHgrLik0mUw5ItYbXLRNnrdPy4EcXOah80R+gHrEC6qd9xRnCTM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758751471; c=relaxed/simple; bh=dLP9/BLbWygvPDr7dc3tU/C4dbsJ+f4ymVXjQ8ZrprI=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; 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List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:1d8a:b0:423:2666:4687 with SMTP id e9e14a558f8ab-425c36bb2cdmr5906755ab.15.1758751469114; Wed, 24 Sep 2025 15:04:29 -0700 (PDT) Date: Wed, 24 Sep 2025 15:04:29 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <68d46aed.050a0220.57ae1.0002.GAE@google.com> Subject: [syzbot] [exfat?] general protection fault in exfat_utf16_to_nls From: syzbot To: linkinjeon@kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, sj1557.seo@samsung.com, syzkaller-bugs@googlegroups.com, yuezhang.mo@sony.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: b5a4da2c459f Add linux-next specific files for 20250924 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=15ffad34580000 kernel config: https://syzkaller.appspot.com/x/.config?x=fc64d939cce41d2 dashboard link: https://syzkaller.appspot.com/bug?extid=3e9cb93e3c5f90d28e19 compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1704cf12580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15c8d4e2580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/127c931e6696/disk-b5a4da2c.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/cf4957abd39e/vmlinux-b5a4da2c.xz kernel image: https://storage.googleapis.com/syzbot-assets/860d3ac61bac/bzImage-b5a4da2c.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/9006b1673f9f/mount_0.gz fsck result: failed (log: https://syzkaller.appspot.com/x/fsck.log?x=11c8d4e2580000) IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+3e9cb93e3c5f90d28e19@syzkaller.appspotmail.com Oops: general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017] CPU: 1 UID: 0 PID: 5979 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025 RIP: 0010:exfat_convert_ucs2_to_char fs/exfat/nls.c:441 [inline] RIP: 0010:__exfat_utf16_to_nls fs/exfat/nls.c:554 [inline] RIP: 0010:exfat_utf16_to_nls+0x21c/0x840 fs/exfat/nls.c:638 Code: 2e 29 ff 66 41 83 fc 7f 77 14 e8 7f 2a 29 ff e9 b6 00 00 00 e8 75 2a 29 ff e9 a9 00 00 00 48 8b 4c 24 40 48 89 c8 48 c1 e8 03 <42> 80 3c 38 00 74 0f 48 8b 7c 24 40 e8 d3 6b 8e ff 48 8b 4c 24 40 RSP: 0018:ffffc90003fef760 EFLAGS: 00010202 RAX: 0000000000000002 RBX: 0000000000000004 RCX: 0000000000000010 RDX: ffff88802f18bc80 RSI: 00000000000000e1 RDI: 0000000000000080 RBP: ffffc90003fef850 R08: 0000000000000005 R09: 0000000000000000 R10: ffffc90003fef7e0 R11: fffff520007fdefc R12: 00000000000000e1 R13: ffffc90003fefa48 R14: 0000000000000000 R15: dffffc0000000000 FS: 000055557b9c2500(0000) GS:ffff888125b03000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055557b9e5608 CR3: 00000000734c8000 CR4: 00000000003526f0 Call Trace: exfat_readdir fs/exfat/dir.c:143 [inline] exfat_iterate+0x19a7/0x2050 fs/exfat/dir.c:243 wrap_directory_iterator+0x96/0xe0 fs/readdir.c:65 iterate_dir+0x399/0x570 fs/readdir.c:108 __do_sys_getdents64 fs/readdir.c:410 [inline] __se_sys_getdents64+0xe4/0x260 fs/readdir.c:396 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f2c837c1833 Code: c1 66 0f 1f 44 00 00 48 83 c4 08 48 89 ef 5b 5d e9 32 3d f8 ff 66 90 b8 ff ff ff 7f 48 39 c2 48 0f 47 d0 b8 d9 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 05 c3 0f 1f 40 00 48 c7 c2 a8 ff ff ff f7 d8 RSP: 002b:00007ffc8cf73ff8 EFLAGS: 00000293 ORIG_RAX: 00000000000000d9 RAX: ffffffffffffffda RBX: 000055557b9dd600 RCX: 00007f2c837c1833 RDX: 0000000000008000 RSI: 000055557b9dd600 RDI: 0000000000000005 RBP: 000055557b9dd5d4 R08: 0000000000028a41 R09: 0000000000000000 R10: 00007f2c839b7cc0 R11: 0000000000000293 R12: ffffffffffffffa8 R13: 0000000000000010 R14: 000055557b9dd5d0 R15: 00007ffc8cf762b0 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:exfat_convert_ucs2_to_char fs/exfat/nls.c:441 [inline] RIP: 0010:__exfat_utf16_to_nls fs/exfat/nls.c:554 [inline] RIP: 0010:exfat_utf16_to_nls+0x21c/0x840 fs/exfat/nls.c:638 Code: 2e 29 ff 66 41 83 fc 7f 77 14 e8 7f 2a 29 ff e9 b6 00 00 00 e8 75 2a 29 ff e9 a9 00 00 00 48 8b 4c 24 40 48 89 c8 48 c1 e8 03 <42> 80 3c 38 00 74 0f 48 8b 7c 24 40 e8 d3 6b 8e ff 48 8b 4c 24 40 RSP: 0018:ffffc90003fef760 EFLAGS: 00010202 RAX: 0000000000000002 RBX: 0000000000000004 RCX: 0000000000000010 RDX: ffff88802f18bc80 RSI: 00000000000000e1 RDI: 0000000000000080 RBP: ffffc90003fef850 R08: 0000000000000005 R09: 0000000000000000 R10: ffffc90003fef7e0 R11: fffff520007fdefc R12: 00000000000000e1 R13: ffffc90003fefa48 R14: 0000000000000000 R15: dffffc0000000000 FS: 000055557b9c2500(0000) GS:ffff888125a03000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000c000692800 CR3: 00000000734c8000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: 2e 29 ff cs sub %edi,%edi 3: 66 41 83 fc 7f cmp $0x7f,%r12w 8: 77 14 ja 0x1e a: e8 7f 2a 29 ff call 0xff292a8e f: e9 b6 00 00 00 jmp 0xca 14: e8 75 2a 29 ff call 0xff292a8e 19: e9 a9 00 00 00 jmp 0xc7 1e: 48 8b 4c 24 40 mov 0x40(%rsp),%rcx 23: 48 89 c8 mov %rcx,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 38 00 cmpb $0x0,(%rax,%r15,1) <-- trapping instruction 2f: 74 0f je 0x40 31: 48 8b 7c 24 40 mov 0x40(%rsp),%rdi 36: e8 d3 6b 8e ff call 0xff8e6c0e 3b: 48 8b 4c 24 40 mov 0x40(%rsp),%rcx --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title 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. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup