linux-kernel - Re: [syzbot] [hfs?] kernel BUG in hfsplus_bnode

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Message-ID: <000000000000efee7905fe4c9a46@google.com>
Date:   Fri, 16 Jun 2023 22:30:53 -0700
From:   syzbot <syzbot+005d2a9ecd9fbf525f6a@...kaller.appspotmail.com>
To:     akpm@...ux-foundation.org, fmdefrancesco@...il.com,
        ira.weiny@...el.com, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, slava@...eyko.com,
        syzkaller-bugs@...glegroups.com, willy@...radead.org
Subject: Re: [syzbot] [hfs?] kernel BUG in hfsplus_bnode_put

syzbot has found a reproducer for the following issue on:

HEAD commit:    40f71e7cd3c6 Merge tag 'net-6.4-rc7' of git://git.kernel.o..
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=10482ae3280000
kernel config:  https://syzkaller.appspot.com/x/.config?x=7ff8f87c7ab0e04e
dashboard link: https://syzkaller.appspot.com/bug?extid=005d2a9ecd9fbf525f6a
compiler:       Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=142e7287280000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=13fd185b280000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/073eea957569/disk-40f71e7c.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/c8a97aaa4cdc/vmlinux-40f71e7c.xz
kernel image: https://storage.googleapis.com/syzbot-assets/f536015eacbd/bzImage-40f71e7c.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/b5f1764cd64d/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+005d2a9ecd9fbf525f6a@...kaller.appspotmail.com

loop0: detected capacity change from 0 to 1024
------------[ cut here ]------------
kernel BUG at fs/hfsplus/bnode.c:618!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 5068 Comm: syz-executor476 Not tainted 6.4.0-rc6-syzkaller-00195-g40f71e7cd3c6 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023
RIP: 0010:hfsplus_bnode_put+0x6b7/0x6d0 fs/hfsplus/bnode.c:618
Code: ff 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c 6c fd ff ff 48 89 df e8 ca 5a 81 ff e9 5f fd ff ff e8 50 83 29 ff 0f 0b e8 49 83 29 ff <0f> 0b e8 42 83 29 ff 0f 0b e8 3b 83 29 ff 0f 0b 66 0f 1f 84 00 00
RSP: 0018:ffffc90003c1f510 EFLAGS: 00010293
RAX: ffffffff8261fc57 RBX: ffff888012ad7180 RCX: ffff888014385940
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffffff8261f620 R09: ffffed100255ae31
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff888012ad7100
R13: dffffc0000000000 R14: ffff8880283d4000 R15: dffffc0000000000
FS:  00007f26ad319700(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f26ad31a000 CR3: 000000001fab8000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 hfsplus_bmap_alloc+0x590/0x640 fs/hfsplus/btree.c:414
 hfs_bnode_split+0xde/0x1110 fs/hfsplus/brec.c:245
 hfsplus_brec_insert+0x3a6/0xdd0 fs/hfsplus/brec.c:100
 hfsplus_create_cat+0xeee/0x1bb0 fs/hfsplus/catalog.c:308
 hfsplus_mknod+0x16a/0x2a0 fs/hfsplus/dir.c:494
 vfs_create+0x1e2/0x330 fs/namei.c:3194
 do_mknodat+0x3c6/0x6e0 fs/namei.c:4043
 __do_sys_mknodat fs/namei.c:4071 [inline]
 __se_sys_mknodat fs/namei.c:4068 [inline]
 __x64_sys_mknodat+0xa9/0xc0 fs/namei.c:4068
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f26ad36d769
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 71 15 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f26ad3192f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000103
RAX: ffffffffffffffda RBX: 00007f26ad3f27a0 RCX: 00007f26ad36d769
RDX: 0000000000000000 RSI: 0000000020000080 RDI: 00000000ffffff9c
RBP: 00007f26ad3bf0c0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000103 R11: 0000000000000246 R12: 00007f26ad3bf1c0
R13: 0073756c70736668 R14: e5652d70fedcf551 R15: 00007f26ad3f27a8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:hfsplus_bnode_put+0x6b7/0x6d0 fs/hfsplus/bnode.c:618
Code: ff 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c 6c fd ff ff 48 89 df e8 ca 5a 81 ff e9 5f fd ff ff e8 50 83 29 ff 0f 0b e8 49 83 29 ff <0f> 0b e8 42 83 29 ff 0f 0b e8 3b 83 29 ff 0f 0b 66 0f 1f 84 00 00
RSP: 0018:ffffc90003c1f510 EFLAGS: 00010293
RAX: ffffffff8261fc57 RBX: ffff888012ad7180 RCX: ffff888014385940
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffffff8261f620 R09: ffffed100255ae31
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff888012ad7100
R13: dffffc0000000000 R14: ffff8880283d4000 R15: dffffc0000000000
FS:  00007f26ad319700(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f26ad31a000 CR3: 000000001fab8000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


---
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.