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Subject[PATCH v2 2/2] hfsplus: fix uninit-value in hfsplus_delete_cat()
Date
Syzkaller reported BUG as follows:

=====================================================
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
=====================================================

Fix this by initializing 'subfolders' of 'struct hfsplus_inode_info'
in hfsplus_iget().

Link: https://syzkaller.appspot.com/bug?id=981f82f21b973f2f5663dfea581ff8cee1ddfef2
Suggested-by: Viacheslav Dubeyko <slava@dubeyko.com>
Signed-off-by: ChenXiaoSong <chenxiaosong2@huawei.com>
---
fs/hfsplus/super.c | 8 +-------
1 file changed, 1 insertion(+), 7 deletions(-)

diff --git a/fs/hfsplus/super.c b/fs/hfsplus/super.c
index 122ed89ebf9f..5812818759dd 100644
--- a/fs/hfsplus/super.c
+++ b/fs/hfsplus/super.c
@@ -67,13 +67,7 @@ struct inode *hfsplus_iget(struct super_block *sb, unsigned long ino)
if (!(inode->i_state & I_NEW))
return inode;

- INIT_LIST_HEAD(&HFSPLUS_I(inode)->open_dir_list);
- spin_lock_init(&HFSPLUS_I(inode)->open_dir_lock);
- mutex_init(&HFSPLUS_I(inode)->extents_lock);
- HFSPLUS_I(inode)->flags = 0;
- HFSPLUS_I(inode)->extent_state = 0;
- HFSPLUS_I(inode)->rsrc_inode = NULL;
- atomic_set(&HFSPLUS_I(inode)->opencnt, 0);
+ hfsplus_init_inode(HFSPLUS_I(inode));

if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID ||
inode->i_ino == HFSPLUS_ROOT_CNID) {
--
2.31.1
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