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Message-ID: <67662480.050a0220.25abdd.0123.GAE@google.com> Date: Fri, 20 Dec 2024 18:14:24 -0800 From: syzbot <syzbot+8941485e471cec199c9e@...kaller.appspotmail.com> To: linkinjeon@...nel.org, linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org, sj1557.seo@...sung.com, syzkaller-bugs@...glegroups.com, yuezhang.mo@...y.com Subject: [syzbot] [exfat?] general protection fault in exfat_find_empty_entry Hello, syzbot found the following issue on: HEAD commit: e9b8ffafd20a Merge tag 'usb-6.13-rc4' of git://git.kernel... git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=120d5cf8580000 kernel config: https://syzkaller.appspot.com/x/.config?x=6a2b862bf4a5409f dashboard link: https://syzkaller.appspot.com/bug?extid=8941485e471cec199c9e compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13edd2df980000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1182af30580000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-e9b8ffaf.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/ad411c12e636/vmlinux-e9b8ffaf.xz kernel image: https://storage.googleapis.com/syzbot-assets/61fac154060e/bzImage-e9b8ffaf.xz mounted in repro #1: https://storage.googleapis.com/syzbot-assets/8fae9ce0ef68/mount_0.gz mounted in repro #2: https://storage.googleapis.com/syzbot-assets/8fa8077be4fc/mount_8.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+8941485e471cec199c9e@...kaller.appspotmail.com Oops: general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] PREEMPT SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f] CPU: 0 UID: 0 PID: 5363 Comm: syz-executor144 Not tainted 6.13.0-rc3-syzkaller-00193-ge9b8ffafd20a #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 RIP: 0010:exfat_find_empty_entry+0x16c9/0x1a10 fs/exfat/namei.c:398 Code: 46 8b ff 48 8b 1b 48 89 d8 48 c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 f5 45 8b ff 48 8b 1b 48 83 c3 18 48 89 d8 48 c1 e8 03 <42> 80 3c 38 00 74 08 48 89 df e8 d8 45 8b ff 4c 8b 33 48 8b 54 24 RSP: 0018:ffffc9000d2af120 EFLAGS: 00010206 RAX: 0000000000000003 RBX: 0000000000000018 RCX: ffff88800068c880 RDX: 0000000000000000 RSI: 00000000fffffffb RDI: 00000000fffffffb RBP: ffffc9000d2af370 R08: ffffffff827a8268 R09: 1ffff110089f4c63 R10: dffffc0000000000 R11: ffffed10089f4c64 R12: 00000000fffffffb R13: ffffc9000d2af820 R14: ffff888044f981a8 R15: dffffc0000000000 FS: 00007f746cfe96c0(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f746cfe9d58 CR3: 000000004287a000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> exfat_add_entry+0x409/0xaa0 fs/exfat/namei.c:496 exfat_create+0x1c7/0x570 fs/exfat/namei.c:565 lookup_open fs/namei.c:3649 [inline] open_last_lookups fs/namei.c:3748 [inline] path_openat+0x1c03/0x3590 fs/namei.c:3984 do_filp_open+0x27f/0x4e0 fs/namei.c:4014 do_sys_openat2+0x13e/0x1d0 fs/open.c:1402 do_sys_open fs/open.c:1417 [inline] __do_sys_openat fs/open.c:1433 [inline] __se_sys_openat fs/open.c:1428 [inline] __x64_sys_openat+0x247/0x2a0 fs/open.c:1428 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f746d074ed9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 18 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:00007f746cfe9218 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f746d0fe6e8 RCX: 00007f746d074ed9 RDX: 000000000000275a RSI: 0000000020000000 RDI: 00000000ffffff9c RBP: 0000000000000000 R08: 00007fff65f63967 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f746d0fe6e0 R13: 00007f746d0cab00 R14: 0030656c69662f2e R15: 00303636396f7369 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:exfat_find_empty_entry+0x16c9/0x1a10 fs/exfat/namei.c:398 Code: 46 8b ff 48 8b 1b 48 89 d8 48 c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 f5 45 8b ff 48 8b 1b 48 83 c3 18 48 89 d8 48 c1 e8 03 <42> 80 3c 38 00 74 08 48 89 df e8 d8 45 8b ff 4c 8b 33 48 8b 54 24 RSP: 0018:ffffc9000d2af120 EFLAGS: 00010206 RAX: 0000000000000003 RBX: 0000000000000018 RCX: ffff88800068c880 RDX: 0000000000000000 RSI: 00000000fffffffb RDI: 00000000fffffffb RBP: ffffc9000d2af370 R08: ffffffff827a8268 R09: 1ffff110089f4c63 R10: dffffc0000000000 R11: ffffed10089f4c64 R12: 00000000fffffffb R13: ffffc9000d2af820 R14: ffff888044f981a8 R15: dffffc0000000000 FS: 00007f746cfe96c0(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f7464a14000 CR3: 000000004287a000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 46 8b ff rex.RX mov %edi,%r15d 3: 48 8b 1b mov (%rbx),%rbx 6: 48 89 d8 mov %rbx,%rax 9: 48 c1 e8 03 shr $0x3,%rax d: 42 80 3c 38 00 cmpb $0x0,(%rax,%r15,1) 12: 74 08 je 0x1c 14: 48 89 df mov %rbx,%rdi 17: e8 f5 45 8b ff call 0xff8b4611 1c: 48 8b 1b mov (%rbx),%rbx 1f: 48 83 c3 18 add $0x18,%rbx 23: 48 89 d8 mov %rbx,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 38 00 cmpb $0x0,(%rax,%r15,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 48 89 df mov %rbx,%rdi 34: e8 d8 45 8b ff call 0xff8b4611 39: 4c 8b 33 mov (%rbx),%r14 3c: 48 rex.W 3d: 8b .byte 0x8b 3e: 54 push %rsp 3f: 24 .byte 0x24 --- 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@...glegroups.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
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