Adding upstream version 4.19.269.upstream/4.19.269

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 7 insertions, 1 deletions

diff --git a/drivers/gpu/drm/drm_ioctl.c b/drivers/gpu/drm/drm_ioctl.c
index babd7ebab..2651bfb76 100644
--- a/drivers/gpu/drm/drm_ioctl.c
+++ b/drivers/gpu/drm/drm_ioctl.c
@@ -458,7 +458,13 @@ EXPORT_SYMBOL(drm_invalid_op);
  */
 static int drm_copy_field(char __user *buf, size_t *buf_len, const char *value)
 {
-	int len;
+	size_t len;
+
+	/* don't attempt to copy a NULL pointer */
+	if (WARN_ONCE(!value, "BUG: the value to copy was not set!")) {
+		*buf_len = 0;
+		return 0;
+	}
 
 	/* don't overflow userbuf */
 	len = strlen(value);