[Patch] quota: do not leak info to user-space

[Cong Wang]

From: Cong Wang <amwang@xxxxxxxxxx>

There is a hole in struct fs_quota_stat, so we have to
zero the struct on stack before copying it to user-space.

Cc: Jan Kara <jack@xxxxxxx>
Signed-off-by: Cong Wang <amwang@xxxxxxxxxx>

---
diff --git a/fs/quota/quota.c b/fs/quota/quota.c
index c7314f1..2b0c182 100644
--- a/fs/quota/quota.c
+++ b/fs/quota/quota.c
@@ -211,6 +211,7 @@ static int quota_getxstate(struct super_block *sb, void __user *addr)
 
 	if (!sb->s_qcop->get_xstate)
 		return -ENOSYS;
+	memset(&fqs, 0, sizeof(fqs));
 	ret = sb->s_qcop->get_xstate(sb, &fqs);
 	if (!ret && copy_to_user(addr, &fqs, sizeof(fqs)))
 		return -EFAULT;
--
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