CompressedCopyTextureCHROMIUM: validate texture targets before looking up levels

gpu/command_buffer/service/gles2_cmd_decoder.cc

Index: gpu/command_buffer/service/gles2_cmd_decoder.cc
diff --git a/gpu/command_buffer/service/gles2_cmd_decoder.cc b/gpu/command_buffer/service/gles2_cmd_decoder.cc
index 74abce022062a0e6a5d22c7e71e7e0d028c44717..dfa07e738ff1897e34351b6d020a16ddbdeaf5fa 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder.cc
+++ b/gpu/command_buffer/service/gles2_cmd_decoder.cc
@@ -14640,6 +14640,11 @@ void GLES2DecoderImpl::DoCompressedCopyTextureCHROMIUM(GLuint source_id,
     return;
   }
 
+  if (!ValidateCompressedCopyTextureCHROMIUM(kFunctionName, source_texture_ref,
+                                             dest_texture_ref)) {
+    return;
+  }
+
   Texture* source_texture = source_texture_ref->texture();
   Texture* dest_texture = dest_texture_ref->texture();
   int source_width = 0;
@@ -14681,11 +14686,6 @@ void GLES2DecoderImpl::DoCompressedCopyTextureCHROMIUM(GLuint source_id,
     return;
   }
 
-  if (!ValidateCompressedCopyTextureCHROMIUM(kFunctionName, source_texture_ref,
-                                             dest_texture_ref)) {
-    return;
-  }
-
   if (!InitializeCopyTextureCHROMIUM(kFunctionName))
     return;