linux-kernel - [syzbot] [cluster?] general protection fault in gfs2_dump

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Date:   Mon, 06 Mar 2023 09:44:37 -0800
From:   syzbot <syzbot+427fed3295e9a7e887f2@...kaller.appspotmail.com>
To:     agruenba@...hat.com, cluster-devel@...hat.com,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        rpeterso@...hat.com, syzkaller-bugs@...glegroups.com
Subject: [syzbot] [cluster?] general protection fault in gfs2_dump_glock (2)

Hello,

syzbot found the following issue on:

HEAD commit:    f915322fe014 Merge tag 'v6.3-p2' of git://git.kernel.org/p..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=16f297b0c80000
kernel config:  https://syzkaller.appspot.com/x/.config?x=dc0f7cfe5b32efe2
dashboard link: https://syzkaller.appspot.com/bug?extid=427fed3295e9a7e887f2
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=11a8b9bcc80000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=11955f54c80000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/ad716bf3cfc2/disk-f915322f.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/3dda0fefb7a2/vmlinux-f915322f.xz
kernel image: https://storage.googleapis.com/syzbot-assets/009b2977ab37/bzImage-f915322f.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/6c7bfd847dac/mount_2.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+427fed3295e9a7e887f2@...kaller.appspotmail.com

gfs2: fsid=syz:syz.0:  H: s:SH f:H e:0 p:6113 [syz-executor409] __gfs2_lookup+0xa4/0x270 fs/gfs2/inode.c:888
==================================================================
BUG: KASAN: vmalloc-out-of-bounds in gfs2_dump_glock+0x14b3/0x1ad0
Read of size 8 at addr ffffc90005957720 by task syz-executor409/6095

CPU: 0 PID: 6095 Comm: syz-executor409 Not tainted 6.2.0-syzkaller-13563-gf915322fe014 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:319 [inline]
 print_report+0x163/0x540 mm/kasan/report.c:430
 kasan_report+0x176/0x1b0 mm/kasan/report.c:536
 gfs2_dump_glock+0x14b3/0x1ad0
 gfs2_consist_inode_i+0xf5/0x110 fs/gfs2/util.c:465
 gfs2_dirent_scan+0x512/0x640 fs/gfs2/dir.c:602
 gfs2_dirent_search+0x30e/0x8c0 fs/gfs2/dir.c:850
 gfs2_dir_search+0xb2/0x2f0 fs/gfs2/dir.c:1650
 gfs2_lookupi+0x460/0x5d0 fs/gfs2/inode.c:332
 __gfs2_lookup+0xa4/0x270 fs/gfs2/inode.c:888
 gfs2_atomic_open+0x9e/0x230 fs/gfs2/inode.c:1292
 atomic_open fs/namei.c:3279 [inline]
 lookup_open fs/namei.c:3387 [inline]
 open_last_lookups fs/namei.c:3484 [inline]
 path_openat+0x103c/0x3170 fs/namei.c:3712
 do_filp_open+0x234/0x490 fs/namei.c:3742
 do_sys_openat2+0x13f/0x500 fs/open.c:1348
 do_sys_open fs/open.c:1364 [inline]
 __do_sys_open fs/open.c:1372 [inline]
 __se_sys_open fs/open.c:1368 [inline]
 __x64_sys_open+0x225/0x270 fs/open.c:1368
 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: 0033:0x7ff0f3f00b39
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 91 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ff0f3ea4208 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 00007ff0f3f90788 RCX: 00007ff0f3f00b39
RDX: 0000000000000008 RSI: 0000000000000002 RDI: 0000000020000280
RBP: 00007ff0f3f90780 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ff0f3f9078c
R13: 00007fffdfd2a3af R14: 00007ff0f3ea4300 R15: 0000000000022000
 </TASK>

Memory state around the buggy address:
 ffffc90005957600: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
 ffffc90005957680: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
>ffffc90005957700: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
                               ^
 ffffc90005957780: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
 ffffc90005957800: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
==================================================================


---
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