Added proper size/offset checks

glTexSubImage3D and glCopyTexSubImage3D were missing
some validity checks for size and offset parameters.

Change-Id: Iff1aa034318c1fc58f9bb433c61bd8623493604a
Reviewed-on: https://swiftshader-review.googlesource.com/3602
Tested-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Nicolas Capens <capn@google.com>

src/OpenGL/libGLESv2/libGLESv3.cpp

diff --git a/src/OpenGL/libGLESv2/libGLESv3.cpp b/src/OpenGL/libGLESv2/libGLESv3.cpp
index 5a90245..e1cef90 100644
--- a/src/OpenGL/libGLESv2/libGLESv3.cpp
+++ b/src/OpenGL/libGLESv2/libGLESv3.cpp
@@ -642,7 +642,7 @@
 		return error(GL_INVALID_VALUE);

 	}

 

-	if((width < 0) || (height < 0) || (depth < 0))

+	if((width < 0) || (height < 0) || (depth < 0) || (xoffset < 0) || (yoffset < 0) || (zoffset < 0))

 	{

 		return error(GL_INVALID_VALUE);

 	}

@@ -680,6 +680,11 @@
 		return error(GL_INVALID_VALUE);

 	}

 

+	if((width < 0) || (height < 0) || (xoffset < 0) || (yoffset < 0) || (zoffset < 0))

+	{

+		return error(GL_INVALID_VALUE);

+	}

+

 	es2::Context *context = es2::getContext();

 

 	if(context)