linux-kernel - [syzbot] KMSAN: uninit-value in hfsplus_delete

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Date:   Mon, 05 Dec 2022 01:19:38 -0800
From:   syzbot <syzbot+fdedff847a0e5e84c39f@...kaller.appspotmail.com>
To:     glider@...gle.com, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: [syzbot] KMSAN: uninit-value in hfsplus_delete_cat

Hello,

syzbot found the following issue on:

HEAD commit:    49a9a20768f5 kmsan: allow using __msan_instrument_asm_stor..
git tree:       https://github.com/google/kmsan.git master
console output: https://syzkaller.appspot.com/x/log.txt?x=1412684d880000
kernel config:  https://syzkaller.appspot.com/x/.config?x=d901b2d28729cb6a
dashboard link: https://syzkaller.appspot.com/bug?extid=fdedff847a0e5e84c39f
compiler:       clang version 15.0.0 (https://github.com/llvm/llvm-project.git 610139d2d9ce6746b3c617fb3e2f7886272d26ff), GNU ld (GNU Binutils for Debian) 2.35.2
userspace arch: i386

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

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/4a944f9f50fb/disk-49a9a207.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/a2ec5594e201/vmlinux-49a9a207.xz
kernel image: https://storage.googleapis.com/syzbot-assets/3aafc1a9ba37/bzImage-49a9a207.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+fdedff847a0e5e84c39f@...kaller.appspotmail.com

loop2: detected capacity change from 0 to 1024
=====================================================
BUG: KMSAN: uninit-value in hfsplus_subfolders_dec fs/hfsplus/catalog.c:248 [inline]
BUG: KMSAN: uninit-value in hfsplus_delete_cat+0x1207/0x14d0 fs/hfsplus/catalog.c:419
 hfsplus_subfolders_dec fs/hfsplus/catalog.c:248 [inline]
 hfsplus_delete_cat+0x1207/0x14d0 fs/hfsplus/catalog.c:419
 hfsplus_rmdir+0x141/0x3d0 fs/hfsplus/dir.c:425
 hfsplus_rename+0x102/0x2e0 fs/hfsplus/dir.c:545
 vfs_rename+0x1e4c/0x2800 fs/namei.c:4779
 do_renameat2+0x173d/0x1dc0 fs/namei.c:4930
 __do_sys_renameat2 fs/namei.c:4963 [inline]
 __se_sys_renameat2 fs/namei.c:4960 [inline]
 __ia32_sys_renameat2+0x14b/0x1f0 fs/namei.c:4960
 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline]
 __do_fast_syscall_32+0xa2/0x100 arch/x86/entry/common.c:178
 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203
 do_SYSENTER_32+0x1b/0x20 arch/x86/entry/common.c:246
 entry_SYSENTER_compat_after_hwframe+0x70/0x82

Uninit was stored to memory at:
 hfsplus_subfolders_inc fs/hfsplus/catalog.c:232 [inline]
 hfsplus_create_cat+0x19e3/0x19f0 fs/hfsplus/catalog.c:314
 hfsplus_mknod+0x1fd/0x560 fs/hfsplus/dir.c:494
 hfsplus_mkdir+0x54/0x60 fs/hfsplus/dir.c:529
 vfs_mkdir+0x62a/0x870 fs/namei.c:4036
 do_mkdirat+0x466/0x7b0 fs/namei.c:4061
 __do_sys_mkdirat fs/namei.c:4076 [inline]
 __se_sys_mkdirat fs/namei.c:4074 [inline]
 __ia32_sys_mkdirat+0xc4/0x120 fs/namei.c:4074
 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline]
 __do_fast_syscall_32+0xa2/0x100 arch/x86/entry/common.c:178
 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203
 do_SYSENTER_32+0x1b/0x20 arch/x86/entry/common.c:246
 entry_SYSENTER_compat_after_hwframe+0x70/0x82

Uninit was created at:
 __alloc_pages+0x9f1/0xe80 mm/page_alloc.c:5581
 alloc_pages+0xaae/0xd80 mm/mempolicy.c:2285
 alloc_slab_page mm/slub.c:1794 [inline]
 allocate_slab+0x1b5/0x1010 mm/slub.c:1939
 new_slab mm/slub.c:1992 [inline]
 ___slab_alloc+0x10c3/0x2d60 mm/slub.c:3180
 __slab_alloc mm/slub.c:3279 [inline]
 slab_alloc_node mm/slub.c:3364 [inline]
 slab_alloc mm/slub.c:3406 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3413 [inline]
 kmem_cache_alloc_lru+0x6f3/0xb30 mm/slub.c:3429
 alloc_inode_sb include/linux/fs.h:3125 [inline]
 hfsplus_alloc_inode+0x56/0xc0 fs/hfsplus/super.c:627
 alloc_inode+0x83/0x440 fs/inode.c:259
 iget_locked+0x2a1/0xe20 fs/inode.c:1286
 hfsplus_iget+0x5f/0xb60 fs/hfsplus/super.c:64
 hfsplus_btree_open+0x13b/0x1cf0 fs/hfsplus/btree.c:150
 hfsplus_fill_super+0x12b0/0x2a80 fs/hfsplus/super.c:473
 mount_bdev+0x508/0x840 fs/super.c:1401
 hfsplus_mount+0x49/0x60 fs/hfsplus/super.c:641
 legacy_get_tree+0x10c/0x280 fs/fs_context.c:610
 vfs_get_tree+0xa1/0x500 fs/super.c:1531
 do_new_mount+0x694/0x1580 fs/namespace.c:3040
 path_mount+0x71a/0x1eb0 fs/namespace.c:3370
 do_mount fs/namespace.c:3383 [inline]
 __do_sys_mount fs/namespace.c:3591 [inline]
 __se_sys_mount+0x734/0x840 fs/namespace.c:3568
 __ia32_sys_mount+0xdf/0x140 fs/namespace.c:3568
 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline]
 __do_fast_syscall_32+0xa2/0x100 arch/x86/entry/common.c:178
 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203
 do_SYSENTER_32+0x1b/0x20 arch/x86/entry/common.c:246
 entry_SYSENTER_compat_after_hwframe+0x70/0x82

CPU: 1 PID: 3898 Comm: syz-executor.2 Not tainted 6.1.0-rc7-syzkaller-63931-g49a9a20768f5 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
=====================================================


---
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