x11drv: prevent out of bound access in DescribePixelFormat

[Jan Zerebecki]

I came accross this one when trying to run Starscape in OpenGL
mode.

If this patch is rejected from inclusion, please tell me why, as i would have to
ask anyway.

From: Jan Zerebecki <jan.wine at zerebecki.de>
Changelog:
x11drv: prevent out of bound access in DescribePixelFormat
---

 dlls/x11drv/opengl.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/dlls/x11drv/opengl.c b/dlls/x11drv/opengl.c
index a2a591e..eb58da9 100644
--- a/dlls/x11drv/opengl.c
+++ b/dlls/x11drv/opengl.c
@@ -369,9 +369,9 @@ int X11DRV_DescribePixelFormat(X11DRV_PD
     return 0;
   }
 
-  if (nCfgs < iPixelFormat) {
-    ERR("unexpected iPixelFormat(%d) > nFormats(%d), returns NULL\n", iPixelFormat, nCfgs);
-    return 0; /* unespected error */
+  if (nCfgs < iPixelFormat || 1 > iPixelFormat) {
+    WARN("unexpected iPixelFormat(%d): not >=1 and <=nFormats(%d), returning NULL\n", iPixelFormat, nCfgs);
+    return 0;
   }
 
   ret = nCfgs;