[PATCH] quota: fix for old quota format

From: Jan Kara <jack@ucw.cz>

Fix a problem in the old quota format when we tried to read quota
information after the end of quota file (that is correct as it might a user
with sufficiently large UID which has no limits or usage).
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

fs/quota_v1.c

@@ -52,6 +52,8 @@ static int v1_read_dqblk(struct dquot *dquot)
 
 	/* Now we are sure filp is valid */
 	offset = v1_dqoff(dquot->dq_id);
+	/* Set structure to 0s in case read fails/is after end of file */
+	memset(&dqblk, 0, sizeof(struct v1_disk_dqblk));
 	fs = get_fs();
 	set_fs(KERNEL_DS);
 	filp->f_op->read(filp, (char *)&dqblk, sizeof(struct v1_disk_dqblk), &offset);