[PATCH v2] hfsplus: Initialize directory subfolders in hfsplus_mknod

[Siddharth Menon <simeddon@gmail.com>]

Addresses uninitialized subfolders attribute being used in 
`hfsplus_subfolders_inc` and `hfsplus_subfolders_dec`.

Fixes: https://syzkaller.appspot.com/bug?extid=fdedff847a0e5e84c39f
Reported-by: syzbot+fdedff847a0e5e84c39f@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/x/report.txt?x=16efda06680000
Signed-off-by: Siddharth Menon <simeddon@gmail.com>
---
Removed changes that was accidentally added while debugging
and reformatted the message.

 fs/hfsplus/dir.c | 3 +++
 1 file changed, 3 insertions(+)
644
--- a/fs/hfsplus/dir.c
+++ b/fs/hfsplus/dir.c
@@ -485,6 +485,9 @@ static int hfsplus_mknod(struct mnt_idmap *idmap, struct inode *dir,
 
 	mutex_lock(&sbi->vh_mutex);
 	inode = hfsplus_new_inode(dir->i_sb, dir, mode);
+	if (test_bit(HFSPLUS_SB_HFSX, &sbi->flags))
+		HFSPLUS_I(dir)->subfolders = 0;
+
 	if (!inode)
 		goto out;
 
-- 
2.39.2