linux-kernel - [syzbot] WARNING in jfs

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Date:   Sat, 15 Oct 2022 12:21:40 -0700
From:   syzbot <syzbot+5fc38b2ddbbca7f5c680@...kaller.appspotmail.com>
To:     jfs-discussion@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
        shaggy@...nel.org, syzkaller-bugs@...glegroups.com
Subject: [syzbot] WARNING in jfs_symlink

Hello,

syzbot found the following issue on:

HEAD commit:    55be6084c8e0 Merge tag 'timers-core-2022-10-05' of git://g..
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=115bf294880000
kernel config:  https://syzkaller.appspot.com/x/.config?x=dba84f541f631c81
dashboard link: https://syzkaller.appspot.com/bug?extid=5fc38b2ddbbca7f5c680
compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1150df3a880000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=12eab444880000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/608ce5a619e1/disk-55be6084.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/df10f9bb630d/vmlinux-55be6084.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/d33a0105c419/mount_1.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+5fc38b2ddbbca7f5c680@...kaller.appspotmail.com

------------[ cut here ]------------
memcpy: detected field-spanning write (size 132) of single field "ip->i_link" at fs/jfs/namei.c:950 (size 18446744073709551615)
WARNING: CPU: 1 PID: 3621 at fs/jfs/namei.c:950 jfs_symlink+0xd0f/0x1120 fs/jfs/namei.c:950
Modules linked in:
CPU: 1 PID: 3621 Comm: syz-executor125 Not tainted 6.0.0-syzkaller-09589-g55be6084c8e0 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022
RIP: 0010:jfs_symlink+0xd0f/0x1120 fs/jfs/namei.c:950
Code: ff e8 a5 7b a4 fe 48 c7 c1 ff ff ff ff 4c 89 e6 48 c7 c2 80 42 29 8a 48 c7 c7 e0 42 29 8a c6 05 2a 7d f4 0a 01 e8 70 fd 67 06 <0f> 0b 48 8b 95 b8 fd ff ff 48 b8 00 00 00 00 00 fc ff df 48 c1 ea
RSP: 0018:ffffc90003357b90 EFLAGS: 00010282
RAX: 0000000000000000 RBX: ffff88806f5515b0 RCX: 0000000000000000
RDX: ffff88807e07e0c0 RSI: ffffffff81605668 RDI: fffff5200066af64
RBP: ffffc90003357e10 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000080000000 R11: 0000000000000001 R12: 0000000000000084
R13: ffff88806f6b05f0 R14: ffff88806f6b0470 R15: ffff888016d04ce0
FS:  0000555556a3e3c0(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000200000c0 CR3: 0000000027bcd000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 vfs_symlink fs/namei.c:4378 [inline]
 vfs_symlink+0x365/0x5b0 fs/namei.c:4363
 do_symlinkat+0x261/0x2e0 fs/namei.c:4407
 __do_sys_symlink fs/namei.c:4429 [inline]
 __se_sys_symlink fs/namei.c:4427 [inline]
 __x64_sys_symlink+0x75/0x90 fs/namei.c:4427
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f5d8476b999
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffce4d88208 EFLAGS: 00000246 ORIG_RAX: 0000000000000058
RAX: ffffffffffffffda RBX: 00007ffce4d88218 RCX: 00007f5d8476b999
RDX: 0000000000fff340 RSI: 00000000200000c0 RDI: 0000000020000040
RBP: 00007ffce4d88210 R08: 00007ffce4d88210 R09: 00007f5d84729910
R10: 00007ffce4d88210 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>


---
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