This fixes some use-after-free situations in dEQP when an xfb state is removed, and then a clear is triggered, which only does a partial validation. It would attempt to read the no-longer-valid buffers, resulting in crashes. Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu> Cc: "11.1 11.2" <mesa-stable@lists.freedesktop.org>