linux-kernel - [syzbot] [ntfs?] KMSAN: uninit-value in post_read_mst

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Date: Tue, 26 Dec 2023 07:59:18 -0800
From: syzbot <syzbot+82248056430fd49210e9@...kaller.appspotmail.com>
To: anton@...era.com, linkinjeon@...nel.org, linux-fsdevel@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-ntfs-dev@...ts.sourceforge.net, 
	syzkaller-bugs@...glegroups.com
Subject: [syzbot] [ntfs?] KMSAN: uninit-value in post_read_mst_fixup (2)

Hello,

syzbot found the following issue on:

HEAD commit:    55cb5f43689d Merge tag 'trace-v6.7-rc6' of git://git.kerne..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=107247e1e80000
kernel config:  https://syzkaller.appspot.com/x/.config?x=4a65fa9f077ead01
dashboard link: https://syzkaller.appspot.com/bug?extid=82248056430fd49210e9
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/ab88d88fa1d1/disk-55cb5f43.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/587fd1186192/vmlinux-55cb5f43.xz
kernel image: https://storage.googleapis.com/syzbot-assets/c7bbb5741191/bzImage-55cb5f43.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+82248056430fd49210e9@...kaller.appspotmail.com

syz-executor.1: attempt to access beyond end of device
loop1: rw=0, sector=2040, nr_sectors = 8 limit=190
ntfs: (device loop1): ntfs_end_buffer_async_read(): Buffer I/O error, logical block 0xff.
=====================================================
BUG: KMSAN: uninit-value in post_read_mst_fixup+0xab8/0xb70 fs/ntfs/mst.c:39
 post_read_mst_fixup+0xab8/0xb70 fs/ntfs/mst.c:39
 ntfs_end_buffer_async_read+0xbb8/0x1a70 fs/ntfs/aops.c:133
 end_bio_bh_io_sync+0x130/0x1d0 fs/buffer.c:2775
 bio_endio+0xb17/0xb70 block/bio.c:1603
 submit_bio_noacct+0x230/0x2840 block/blk-core.c:816
 submit_bio+0x171/0x1c0 block/blk-core.c:842
 submit_bh_wbc+0x7de/0x850 fs/buffer.c:2821
 submit_bh+0x26/0x30 fs/buffer.c:2826
 ntfs_read_block fs/ntfs/aops.c:339 [inline]
 ntfs_read_folio+0x364b/0x3930 fs/ntfs/aops.c:430
 filemap_read_folio+0xce/0x370 mm/filemap.c:2323
 do_read_cache_folio+0x3b4/0x11e0 mm/filemap.c:3691
 do_read_cache_page mm/filemap.c:3757 [inline]
 read_cache_page+0x63/0x1c0 mm/filemap.c:3766
 read_mapping_page include/linux/pagemap.h:871 [inline]
 ntfs_map_page fs/ntfs/aops.h:75 [inline]
 check_mft_mirror fs/ntfs/super.c:1117 [inline]
 load_system_files+0x985/0x97b0 fs/ntfs/super.c:1780
 ntfs_fill_super+0x307e/0x45d0 fs/ntfs/super.c:2900
 mount_bdev+0x3d7/0x560 fs/super.c:1650
 ntfs_mount+0x4d/0x60 fs/ntfs/super.c:3057
 legacy_get_tree+0x110/0x290 fs/fs_context.c:662
 vfs_get_tree+0xa5/0x520 fs/super.c:1771
 do_new_mount+0x68d/0x1550 fs/namespace.c:3337
 path_mount+0x73d/0x1f20 fs/namespace.c:3664
 do_mount fs/namespace.c:3677 [inline]
 __do_sys_mount fs/namespace.c:3886 [inline]
 __se_sys_mount+0x725/0x810 fs/namespace.c:3863
 __x64_sys_mount+0xe4/0x140 fs/namespace.c:3863
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x44/0x110 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

Uninit was created at:
 __alloc_pages+0x9a4/0xe00 mm/page_alloc.c:4591
 alloc_pages_mpol+0x62b/0x9d0 mm/mempolicy.c:2133
 alloc_pages mm/mempolicy.c:2204 [inline]
 folio_alloc+0x1da/0x380 mm/mempolicy.c:2211
 filemap_alloc_folio+0xa5/0x430 mm/filemap.c:974
 do_read_cache_folio+0x163/0x11e0 mm/filemap.c:3655
 do_read_cache_page mm/filemap.c:3757 [inline]
 read_cache_page+0x63/0x1c0 mm/filemap.c:3766
 read_mapping_page include/linux/pagemap.h:871 [inline]
 ntfs_map_page fs/ntfs/aops.h:75 [inline]
 check_mft_mirror fs/ntfs/super.c:1117 [inline]
 load_system_files+0x985/0x97b0 fs/ntfs/super.c:1780
 ntfs_fill_super+0x307e/0x45d0 fs/ntfs/super.c:2900
 mount_bdev+0x3d7/0x560 fs/super.c:1650
 ntfs_mount+0x4d/0x60 fs/ntfs/super.c:3057
 legacy_get_tree+0x110/0x290 fs/fs_context.c:662
 vfs_get_tree+0xa5/0x520 fs/super.c:1771
 do_new_mount+0x68d/0x1550 fs/namespace.c:3337
 path_mount+0x73d/0x1f20 fs/namespace.c:3664
 do_mount fs/namespace.c:3677 [inline]
 __do_sys_mount fs/namespace.c:3886 [inline]
 __se_sys_mount+0x725/0x810 fs/namespace.c:3863
 __x64_sys_mount+0xe4/0x140 fs/namespace.c:3863
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x44/0x110 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

CPU: 0 PID: 6133 Comm: syz-executor.1 Not tainted 6.7.0-rc6-syzkaller-00022-g55cb5f43689d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
=====================================================


---
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