Fix (unreported) error on freeing timers which customdata pointer shall not be freed.

Looks like there was no way to avoid that so far, since
WM_event_add_timer_notifier can set mere int-in-pointer there, this can
cause issues. So added mere flags system to wmTimer to allow
controlling this.

2 files changed, 9 insertions, 2 deletions

diff --git a/source/blender/windowmanager/WM_types.h b/source/blender/windowmanager/WM_types.h
index 0f7d41295f1..8fca0ce959e 100644
--- a/source/blender/windowmanager/WM_types.h
+++ b/source/blender/windowmanager/WM_types.h
@@ -508,6 +508,10 @@ typedef struct wmNDOFMotionData {
 } wmNDOFMotionData;
 #endif /* WITH_INPUT_NDOF */
 
+typedef enum {  /* Timer flags */
+	WM_TIMER_NO_FREE_CUSTOM_DATA  = 1 << 0,  /* Do not attempt to free customdata pointer even if non-NULL. */
+} wmTimerFlags;
+
 typedef struct wmTimer {
 	struct wmTimer *next, *prev;
 	
@@ -515,6 +519,7 @@ typedef struct wmTimer {
 
 	double timestep;		/* set by timer user */
 	int event_type;			/* set by timer user, goes to event system */
+	wmTimerFlags flags;		/* Various flags controlling timer options, see below. */
 	void *customdata;		/* set by timer user, to allow custom values */
 	
 	double duration;		/* total running time in seconds */
@@ -523,7 +528,7 @@ typedef struct wmTimer {
 	double ltime;			/* internal, last time timer was activated */
 	double ntime;			/* internal, next time we want to activate the timer */
 	double stime;			/* internal, when the timer started */
-	int sleep;				/* internal, put timers to sleep when needed */
+	bool sleep;				/* internal, put timers to sleep when needed */
 } wmTimer;
 
 typedef struct wmOperatorType {
diff --git a/source/blender/windowmanager/intern/wm_window.c b/source/blender/windowmanager/intern/wm_window.c
index 79078b321da..bf3d28e39e0 100644
--- a/source/blender/windowmanager/intern/wm_window.c
+++ b/source/blender/windowmanager/intern/wm_window.c
@@ -1466,6 +1466,7 @@ wmTimer *WM_event_add_timer_notifier(wmWindowManager *wm, wmWindow *win, unsigne
 	wt->timestep = timestep;
 	wt->win = win;
 	wt->customdata = SET_UINT_IN_POINTER(type);
+	wt->flags |= WM_TIMER_NO_FREE_CUSTOM_DATA;
 
 	BLI_addtail(&wm->timers, wt);
 
@@ -1487,8 +1488,9 @@ void WM_event_remove_timer(wmWindowManager *wm, wmWindow *UNUSED(win), wmTimer *
 			wm->reports.reporttimer = NULL;
 		
 		BLI_remlink(&wm->timers, wt);
-		if (wt->customdata)
+		if (wt->customdata != NULL && (wt->flags & WM_TIMER_NO_FREE_CUSTOM_DATA) == 0) {
 			MEM_freeN(wt->customdata);
+		}
 		MEM_freeN(wt);
 		
 		/* there might be events in queue with this timer as customdata */