3 files changed, 19 insertions, 4 deletions
diff --git a/xorg-server/hw/xfree86/modes/xf86Crtc.c b/xorg-server/hw/xfree86/modes/xf86Crtc.c
index d20152ce6..2628409d2 100644
--- a/xorg-server/hw/xfree86/modes/xf86Crtc.c
+++ b/xorg-server/hw/xfree86/modes/xf86Crtc.c
@@ -2453,7 +2453,7 @@ xf86InitialConfiguration(ScrnInfoPtr scrn, Bool canGrow)
         xf86CrtcPtr crtc = crtcs[o];
 
         if (mode && crtc) {
-            crtc->desiredMode = *mode;
+            xf86SaveModeContents(&crtc->desiredMode, mode);
             crtc->desiredRotation = output->initial_rotation;
             crtc->desiredX = output->initial_x;
             crtc->desiredY = output->initial_y;
@@ -2637,7 +2637,7 @@ xf86SetDesiredModes(ScrnInfoPtr scrn)
 
             if (!mode)
                 return FALSE;
-            crtc->desiredMode = *mode;
+            xf86SaveModeContents(&crtc->desiredMode, mode);
             crtc->desiredRotation = RR_Rotate_0;
             crtc->desiredTransformPresent = FALSE;
             crtc->desiredX = 0;
@@ -2776,7 +2776,7 @@ xf86SetSingleMode(ScrnInfoPtr pScrn, DisplayModePtr desired, Rotation rotation)
         if (!xf86CrtcSetModeTransform(crtc, crtc_mode, rotation, NULL, 0, 0))
             ok = FALSE;
         else {
-            crtc->desiredMode = *crtc_mode;
+            xf86SaveModeContents(&crtc->desiredMode, crtc_mode);
             crtc->desiredRotation = rotation;
             crtc->desiredTransformPresent = FALSE;
             crtc->desiredX = 0;
diff --git a/xorg-server/hw/xfree86/modes/xf86Modes.c b/xorg-server/hw/xfree86/modes/xf86Modes.c
index 2a6d26756..c4a3eb0a3 100644
--- a/xorg-server/hw/xfree86/modes/xf86Modes.c
+++ b/xorg-server/hw/xfree86/modes/xf86Modes.c
@@ -191,6 +191,21 @@ xf86SetModeCrtc(DisplayModePtr p, int adjustFlags)
 }
 
 /**
+ * Fills in a copy of mode, removing all stale pointer references.
+ * xf86ModesEqual will return true when comparing with original mode.
+ */
+void
+xf86SaveModeContents(DisplayModePtr intern, const DisplayModeRec *mode)
+{
+    *intern = *mode;
+    intern->prev = intern->next = NULL;
+    intern->name = NULL;
+    intern->PrivSize = 0;
+    intern->PrivFlags = 0;
+    intern->Private = NULL;
+}
+
+/**
  * Allocates and returns a copy of pMode, including pointers within pMode.
  */
 DisplayModePtr
diff --git a/xorg-server/hw/xfree86/modes/xf86RandR12.c b/xorg-server/hw/xfree86/modes/xf86RandR12.c
index b4ed46aeb..4be0ea32f 100644
--- a/xorg-server/hw/xfree86/modes/xf86RandR12.c
+++ b/xorg-server/hw/xfree86/modes/xf86RandR12.c
@@ -1219,7 +1219,7 @@ xf86RandR12CrtcSet(ScreenPtr pScreen,
             /*
              * Save the last successful setting for EnterVT
              */
-            crtc->desiredMode = mode;
+            xf86SaveModeContents(&crtc->desiredMode, &mode);
             crtc->desiredRotation = rotation;
             crtc->current_scanout = randr_crtc->scanout_pixmap;
             if (transform) {