[PATCH] janitor: unchecked copy_from_user in ieee1394/amdtp

author: Daniele Bellucci <bellucda@tiscali.it>

Fix an unchecked copy_from_user in ieee1394/amdtp.

drivers/ieee1394/amdtp.c

@@ -62,6 +62,12 @@
  * - Maybe make an ALSA interface, that is, create a file_ops
  *   implementation that recognizes ALSA ioctls and uses defaults for
  *   things that can't be controlled through ALSA (iso channel).
+ *
+ *   Changes:
+ *
+ * - Audit copy_from_user in amdtp_write.
+ *                           Daniele Bellucci <bellucda@tiscali.it>
+ *
  */
 
 #include <linux/module.h>
@@ -1112,7 +1118,8 @@ static ssize_t amdtp_write(struct file *file, const char *buffer, size_t count,
 
 	for (i = 0; i < count; i += length) {
 		p = buffer_put_bytes(s->input, count - i, &length);
-		copy_from_user(p, buffer + i, length);
+		if (copy_from_user(p, buffer + i, length))
+			return -EFAULT;
 		if (s->input->length < s->input->size)
 			continue;