mesa: add missing texture integer test in glTexSubImage()

If the texture format is integer, the incoming user data must also be
integer (and similarly for non-integer textures).

NOTE: This is a candidate for the stable branches.

Reviewed-by: Yuanhan Liu <yuanhan.liu@linux.intel.com>
Reviewed-by: Eric Anholt <eric@anholt.net>

src/mesa/main/teximage.c

@@ -1852,6 +1852,17 @@ subtexture_error_check2( struct gl_context *ctx, GLuint dimensions,
       }         
    }
 
+   if (ctx->VersionMajor >= 3 || ctx->Extensions.EXT_texture_integer) {
+      /* both source and dest must be integer-valued, or neither */
+      if (_mesa_is_format_integer_color(destTex->TexFormat) !=
+          _mesa_is_integer_format(format)) {
+         _mesa_error(ctx, GL_INVALID_OPERATION,
+                     "glTexSubImage%dD(integer/non-integer format mismatch)",
+                     dimensions);
+         return GL_TRUE;
+      }
+   }
+
    return GL_FALSE;
 }