stw/wgl: add null context check in wglBindTexImageARB()

To avoid dereferencing a null pointer in case wglMakeCurrent() wasn't
called.  Found while debugging SWKOTOR game.

Reviewed-by: Neha Bhende <bhenden@vmware.com>
Reviewed-by: Charmaine Lee <charmainel@vmware.com>

diff --git a/src/gallium/state_trackers/wgl/stw_ext_rendertexture.c b/src/gallium/state_trackers/wgl/stw_ext_rendertexture.c
index 5eeb0df21f18d185af72ff36642e1036ea11f9a5..9d766966771ffe44561c084822dcfffac24d0aa1 100644 (file)
--- a/src/gallium/state_trackers/wgl/stw_ext_rendertexture.c
+++ b/src/gallium/state_trackers/wgl/stw_ext_rendertexture.c
@@ -129,6 +129,12 @@ wglBindTexImageARB(HPBUFFERARB hPbuffer, int iBuffer)
     * we do here.
     */
 
+   if (!curctx) {
+      debug_printf("No rendering context in wglBindTexImageARB()\n");
+      SetLastError(ERROR_INVALID_OPERATION);
+      return FALSE;
+   }
+
    fb = stw_framebuffer_from_HPBUFFERARB(hPbuffer);
    if (!fb) {
       debug_printf("Invalid pbuffer handle in wglBindTexImageARB()\n");