[v2] drivers/media/video/v4l2-compat-ioctl32.c: Check the return value of copy_to_user

Commit Message

Thiago Farina Dec. 21, 2010, 11:48 p.m. UTC

None

Patch

diff --git a/drivers/media/video/v4l2-compat-ioctl32.c b/drivers/media/video/v4l2-compat-ioctl32.c
index e30e8df..6f2a022 100644
--- a/drivers/media/video/v4l2-compat-ioctl32.c
+++ b/drivers/media/video/v4l2-compat-ioctl32.c
@@ -201,14 +201,12 @@  static struct video_code __user *get_microcode32(struct video_code32 *kp)
 
 	up = compat_alloc_user_space(sizeof(*up));
 
-	/*
-	 * NOTE! We don't actually care if these fail. If the
-	 * user address is invalid, the native ioctl will do
-	 * the error handling for us
-	 */
-	(void) copy_to_user(up->loadwhat, kp->loadwhat, sizeof(up->loadwhat));
-	(void) put_user(kp->datasize, &up->datasize);
-	(void) put_user(compat_ptr(kp->data), &up->data);
+	if (copy_to_user(up->loadwhat, kp->loadwhat, sizeof(up->loadwhat)))
+		return NULL;
+	if (put_user(kp->datasize, &up->datasize))
+		return NULL;
+	if (put_user(compat_ptr(kp->data), &up->data))
+		return NULL;
 	return up;
 }