--- ray/src/common/bmpfile.c	2005/05/10 01:08:43	2.15
+++ ray/src/common/bmpfile.c	2016/03/10 23:18:59	2.17
@@ -1,5 +1,5 @@
 #ifndef lint
-static const char RCSid[] = "$Id: bmpfile.c,v 2.15 2005/05/10 01:08:43 greg Exp $";
+static const char RCSid[] = "$Id: bmpfile.c,v 2.17 2016/03/10 23:18:59 schorsch Exp $";
 #endif
 /*
  *  Windows and OS/2 BMP file support
@@ -549,7 +549,7 @@ BMPmappedHeader(int xr, int yr, int infolen, int ncolo
 	else
 		return NULL;
 	hdr = (BMPHeader *)malloc(sizeof(BMPHeader) +
-					sizeof(RGBquad)*(1<<n) -
+					sizeof(RGBquad)*((size_t)1<<n) -
 					sizeof(hdr->palette) +
 					infolen);
 	if (hdr == NULL)
@@ -563,7 +563,7 @@ BMPmappedHeader(int xr, int yr, int infolen, int ncolo
 	hdr->nColors = ncolors;
 	hdr->impColors = 0;			/* says all colors important */
 	hdr->infoSiz = infolen;
-	memset((void *)hdr->palette, 0, sizeof(RGBquad)*(1<<n) + infolen);
+	memset((void *)hdr->palette, 0, sizeof(RGBquad)*((size_t)1<<n) + infolen);
 	for (n = ncolors; n--; )
 		hdr->palette[n].r = hdr->palette[n].g =
 			hdr->palette[n].b = n*255/(ncolors-1);