linux-kernel - [syzbot] [gfs2?] KMSAN: uninit-value in gfs2_quota

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Message-ID: <674773cd.050a0220.21d33d.0027.GAE@google.com>
Date: Wed, 27 Nov 2024 11:32:29 -0800
From: syzbot <syzbot+9fb37b567267511a9e11@...kaller.appspotmail.com>
To: agruenba@...hat.com, gfs2@...ts.linux.dev, linux-kernel@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com
Subject: [syzbot] [gfs2?] KMSAN: uninit-value in gfs2_quota_init (2)

Hello,

syzbot found the following issue on:

HEAD commit:    9f16d5e6f220 Merge tag 'for-linus' of git://git.kernel.org..
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=140fe530580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=ce1e2eda2213557
dashboard link: https://syzkaller.appspot.com/bug?extid=9fb37b567267511a9e11
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=120fe530580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=119ae778580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/2fcdec73c0f3/disk-9f16d5e6.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/d4dc8d1847e1/vmlinux-9f16d5e6.xz
kernel image: https://storage.googleapis.com/syzbot-assets/db0e04822d2c/bzImage-9f16d5e6.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/c42d45c3f3cb/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+9fb37b567267511a9e11@...kaller.appspotmail.com

gfs2: fsid=syz:syz.0: first mount done, others may mount
syz-executor205: attempt to access beyond end of device
loop0: rw=12288, sector=2251799813685248, nr_sectors = 8 limit=32768
=====================================================
BUG: KMSAN: uninit-value in gfs2_metatype_check_i fs/gfs2/util.h:125 [inline]
BUG: KMSAN: uninit-value in gfs2_quota_init+0x22c4/0x2950 fs/gfs2/quota.c:1432
 gfs2_metatype_check_i fs/gfs2/util.h:125 [inline]
 gfs2_quota_init+0x22c4/0x2950 fs/gfs2/quota.c:1432
 gfs2_make_fs_rw+0x4cf/0x6a0 fs/gfs2/super.c:159
 gfs2_fill_super+0x43f5/0x45a0 fs/gfs2/ops_fstype.c:1274
 get_tree_bdev_flags+0x6ec/0x910 fs/super.c:1636
 get_tree_bdev+0x37/0x50 fs/super.c:1659
 gfs2_get_tree+0x5c/0x340 fs/gfs2/ops_fstype.c:1330
 vfs_get_tree+0xb1/0x5a0 fs/super.c:1814
 do_new_mount+0x71f/0x15e0 fs/namespace.c:3507
 path_mount+0x742/0x1f10 fs/namespace.c:3834
 do_mount fs/namespace.c:3847 [inline]
 __do_sys_mount fs/namespace.c:4057 [inline]
 __se_sys_mount+0x722/0x810 fs/namespace.c:4034
 __x64_sys_mount+0xe4/0x150 fs/namespace.c:4034
 x64_sys_call+0x39bf/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:166
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was created at:
 __alloc_pages_noprof+0x9a7/0xe00 mm/page_alloc.c:4774
 alloc_pages_mpol_noprof+0x299/0x990 mm/mempolicy.c:2265
 alloc_pages_noprof mm/mempolicy.c:2344 [inline]
 folio_alloc_noprof+0x1db/0x310 mm/mempolicy.c:2351
 filemap_alloc_folio_noprof+0xa6/0x440 mm/filemap.c:1009
 __filemap_get_folio+0xac4/0x1550 mm/filemap.c:1951
 gfs2_getbuf+0x23f/0xcd0 fs/gfs2/meta_io.c:142
 gfs2_meta_ra+0x17f/0x7b0 fs/gfs2/meta_io.c:532
 gfs2_quota_init+0x78d/0x2950 fs/gfs2/quota.c:1429
 gfs2_make_fs_rw+0x4cf/0x6a0 fs/gfs2/super.c:159
 gfs2_fill_super+0x43f5/0x45a0 fs/gfs2/ops_fstype.c:1274
 get_tree_bdev_flags+0x6ec/0x910 fs/super.c:1636
 get_tree_bdev+0x37/0x50 fs/super.c:1659
 gfs2_get_tree+0x5c/0x340 fs/gfs2/ops_fstype.c:1330
 vfs_get_tree+0xb1/0x5a0 fs/super.c:1814
 do_new_mount+0x71f/0x15e0 fs/namespace.c:3507
 path_mount+0x742/0x1f10 fs/namespace.c:3834
 do_mount fs/namespace.c:3847 [inline]
 __do_sys_mount fs/namespace.c:4057 [inline]
 __se_sys_mount+0x722/0x810 fs/namespace.c:4034
 __x64_sys_mount+0xe4/0x150 fs/namespace.c:4034
 x64_sys_call+0x39bf/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:166
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

CPU: 0 UID: 0 PID: 5797 Comm: syz-executor205 Not tainted 6.12.0-syzkaller-09073-g9f16d5e6f220 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
=====================================================


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
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If the report is already addressed, let syzbot know by replying with:
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#syz undup