From: Alex Deucher <alexdeucher@gmail.com>
Date: Tue, 2 Jun 2009 23:20:24 +0000 (-0400)
Subject: fix an overflow in SPI_VS_OUT_CONFIG
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=b55d0dd3baa16bebcbbb5629951098943f55fe74;p=mesa.git

fix an overflow in SPI_VS_OUT_CONFIG

VS must always export at least 1 param.
---

diff --git a/src/mesa/drivers/dri/r600/r700_vertprog.c b/src/mesa/drivers/dri/r600/r700_vertprog.c
index a827de197be..ecb72549feb 100644
--- a/src/mesa/drivers/dri/r600/r700_vertprog.c
+++ b/src/mesa/drivers/dri/r600/r700_vertprog.c
@@ -383,7 +383,7 @@ GLboolean r700SetupVertexProgram(GLcontext * ctx)
                  STACK_SIZE_shift, STACK_SIZE_mask);
     }
 
-    SETfield(r700->SPI_VS_OUT_CONFIG.u32All, vp->r700Shader.nParamExports - 1,
+    SETfield(r700->SPI_VS_OUT_CONFIG.u32All, vp->r700Shader.nParamExports ? (vp->r700Shader.nParamExports - 1) : 0,
              VS_EXPORT_COUNT_shift, VS_EXPORT_COUNT_mask);
 	SETfield(r700->SPI_PS_IN_CONTROL_0.u32All, vp->r700Shader.nParamExports,
              NUM_INTERP_shift, NUM_INTERP_mask);