src/r_segs.c

@@ -1769,6 +1769,9 @@ void R_StoreWallRange(INT32 start, INT32 stop)
 			while (need > maxopenings);
 			openings = Z_Realloc(openings, maxopenings * sizeof (*openings), PU_STATIC, NULL);
 			lastopening = openings + pos;
+			
+			if (oldopenings == NULL)
+			return;
 
 			// borrowed fix from *cough* zdoom *cough*
 			// [RH] We also need to adjust the openings pointers that

src/r_things.c

@@ -851,6 +851,15 @@ static void R_DrawVisSprite(vissprite_t *vis)
 		if (overflow_test < 0) overflow_test = -overflow_test;
 		if ((UINT64)overflow_test&0xFFFFFFFF80000000ULL) return; // ditto
 	}
+	
+	// TODO This check should not be necessary. But Papersprites near to the camera will sometimes create invalid values
+	// for the vissprite's startfrac. This happens because they are not depth culled like other sprites.
+	// Someone who is more familiar with papersprites pls check and try to fix <3
+	if (vis->startfrac < 0 || vis->startfrac > (patch->width << FRACBITS))
+	{
+		// never draw vissprites with startfrac out of patch range
+		return;
+	}
 
 	colfunc = basecolfunc; // hack: this isn't resetting properly somewhere.
 	dc_colormap = vis->colormap;

src/r_things.h

@@ -152,8 +152,6 @@ typedef struct vissprite_s
 
 	extracolormap_t *extra_colormap; // global colormaps
 
-	//fixed_t xscale;
-
 	// Precalculated top and bottom screen coords for the sprite.
 	fixed_t thingheight; // The actual height of the thing (for 3D floors)
 	sector_t *sector; // The sector containing the thing.