[PATCH] tdfxfb: Fix buffer overrun

The pseudo_palette has room only for 16 entries, but tdfxfb_setcolreg may
attempt to write more.

Coverity Bug 557
Signed-off-by: Antonino Daplas <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/video/tdfxfb.c

@@ -794,6 +794,7 @@ static int tdfxfb_setcolreg(unsigned regno, unsigned red, unsigned green,
 		break;
 	/* Truecolor has no hardware color palettes. */
 	case FB_VISUAL_TRUECOLOR:
+		if (regno < 16) {
 			rgbcol = (CNVT_TOHW( red, info->var.red.length) <<
 				  info->var.red.offset) |
 				(CNVT_TOHW( green, info->var.green.length) <<
@@ -803,11 +804,14 @@ static int tdfxfb_setcolreg(unsigned regno, unsigned red, unsigned green,
 				(CNVT_TOHW( transp, info->var.transp.length) <<
 				 info->var.transp.offset);
 			par->palette[regno] = rgbcol;
+		}
+
 		break;
 	default:
 		DPRINTK("bad depth %u\n", info->var.bits_per_pixel);
 		break;
 	}
+
 	return 0;
 }