--- linux-2.6/drivers/media/video/gspca/zc3xx.c	2008-07-29 23:26:21.000000000 -0400
+++ linux-2.6-wk/drivers/media/video/gspca/zc3xx.c	2008-08-03 02:17:29.000000000 -0400
@@ -6476,12 +6476,15 @@
 	Tgamma = gamma_tb[sd->gamma];
 	Tgradient = gradient_tb[sd->gamma];
 
-	k = (sd->contrast - 128)		/* -128 / 128 */
+	if(!Tgamma)
+		k = 0;
+	else
+		k = (sd->contrast - 128)		/* -128 / 128 */
 			* Tgamma[0];
 	PDEBUG(D_CONF, "gamma:%d contrast:%d gamma coeff: %d/128",
 		sd->gamma, sd->contrast, k);
 	for (i = 0; i < 16; i++) {
-		g = Tgamma[i] + kgamma_tb[i] * k / 128;
+		g = (Tgamma ? Tgamma[i] : 0) + kgamma_tb[i] * k / 128;
 		if (g > 0xff)
 			g = 0xff;
 		else if (g <= 0)
@@ -6497,7 +6500,7 @@
 	PDEBUG(D_CONF, "    %02x %02x %02x %02x %02x %02x %02x %02x",
 		v[8], v[9], v[10], v[11], v[12], v[13], v[14], v[15]);
 	for (i = 0; i < 16; i++) {
-		g = Tgradient[i] - kgrad_tb[i] * k / 128;
+		g = (Tgradient ? Tgradient[i] : 0) - kgrad_tb[i] * k / 128;
 		if (g > 0xff)
 			g = 0xff;
 		else if (g <= 0) {