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If `_glamor_create_tex()` fails to allocate the FBO because of GL_OUT_OF_MEMORY error, the `pixmap_priv->fbo` is NULL. However, `glamor_get_pixmap_texture()` doesn't actually check whether the `pixmap_priv->fbo` is NULL and will segfault with a NULL pointer dereference trying to access the `pixmap_priv->fbo->tex`. Signed-off-by: Olivier Fourdan <ofourdan@redhat.com> Closes: xorg/xserver#647
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