hppfs: hppfs_read_file() may return -ERROR

hppfs_read_file() may return (ssize_t) -ENOMEM, or -EFAULT.  When stored
in size_t 'count', these errors will not be noticed, a large value will be
added to *ppos.
Signed-off-by: NRoel Kluin <roel.kluin@gmail.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

fs/hppfs/hppfs.c

@@ -280,7 +280,12 @@ static ssize_t hppfs_read(struct file *file, char __user *buf, size_t count,
 			       "errno = %d\n", err);
 			return err;
 		}
-		count = hppfs_read_file(hppfs->host_fd, buf, count);
+		err = hppfs_read_file(hppfs->host_fd, buf, count);
+		if (err < 0) {
+			printk(KERN_ERR "hppfs_read: read failed: %d\n", err);
+			return err;
+		}
+		count = err;
 		if (count > 0)
 			*ppos += count;
 	}