mir server crashes with SIGFPE in glEGLImageTargetTexture2DOES

mir server crashes with SIGFPE in glEGLImageTargetTexture2DOES.

I discovered this by accident. Create a simple connection and surface with EGL initialization. If the surface was created with an unsupported pixel format then as soon as the client calls eglInitialize, the server will crash. Obviously an error should have been reported to the client. The server should not crash...

Program received signal SIGFPE, Arithmetic exception.
intel_set_texture_image_region (ctx=ctx@entry=0x785f20,
    image=image@entry=0xa26de0, region=0x7fffdc001e90,
    target=target@entry=3553, internalFormat=<optimised out>,
    format=<optimised out>, offset=0) at intel_tex_image.c:280
280 intel_tex_image.c: No such file or directory.
(gdb) bt
#0 intel_set_texture_image_region (ctx=ctx@entry=0x785f20,
    image=image@entry=0xa26de0, region=0x7fffdc001e90,
    target=target@entry=3553, internalFormat=<optimised out>,
    format=<optimised out>, offset=0) at intel_tex_image.c:280
#1 0x00007ffff3669b4a in intel_image_target_texture_2d (ctx=0x785f20,
    target=3553, texObj=<optimised out>, texImage=0xa26de0,
    image_handle=<optimised out>) at intel_tex_image.c:364
#2 0x00007ffff319ff97 in _mesa_EGLImageTargetTexture2DOES (target=3553,
    image=0xa63530) at ../../../../../src/mesa/main/teximage.c:3207
#3 0x00007ffff7b9f32d in (anonymous namespace)::EGLImageBufferTextureBinder::bind_to_texture (this=0x7fffdc001f10)
    at /home/dan/bzr/mir/toy/src/graphics/gbm/gbm_buffer_allocator.cpp:101
#4 0x00007ffff7b97d57 in mir::graphics::GLRenderer::render(std::function<void (std::shared_ptr<void> const&)>, mir::graphics::Renderable&) (this=0x91fd10,
    save_resource=..., renderable=...)
    at /home/dan/bzr/mir/toy/src/graphics/gl_renderer.cpp:270
#5 0x00007ffff7b828ca in mir::compositor::RenderingOperator::operator() (
    this=0x7fffffffe260, renderable=...)
    at /home/dan/bzr/mir/toy/src/compositor/rendering_operator.cpp:32
#6 0x00007ffff7b9a68b in mir::surfaces::SurfaceStack::for_each_if (
    this=0x910be0, filter=..., renderable_operator=...)
    at /home/dan/bzr/mir/toy/src/surfaces/surface_stack.cpp:49
#7 0x00007ffff7b7cecc in operator() (buffer=..., this=0xa67cf0)
    at /home/dan/bzr/mir/toy/src/compositor/compositor.cpp:72
#8 std::_Function_handler<void(mir::graphics::DisplayBuffer&), mir::compositor::Compositor::render(mir::graphics::Display*)::<lambda(mir::graphics::DisplayBuffer&)> >::_M_invoke(const std::_Any_data &, mir::graphics::DisplayBuffer &) (
    __functor=..., __args#0=...) at /usr/include/c++/4.6/functional:1778
#9 0x00007ffff7ba26ec in operator() (__args#0=..., this=0x7fffffffe320)
    at /usr/include/c++/4.6/functional:2161
#10 mir::graphics::gbm::GBMDisplay::for_each_display_buffer(std::function<void (mir::graphics::DisplayBuffer&)> const&) (this=<optimised out>, f=...)
    at /home/dan/bzr/mir/toy/src/graphics/gbm/gbm_display.cpp:63
#11 0x00007ffff7b7cca2 in mir::compositor::Compositor::render (this=0xa69010,
    display=0x61e050) at /home/dan/bzr/mir/toy/src/compositor/compositor.cpp:75
#12 0x00007ffff7b6e66d in mir::DisplayServer::start (this=0x7fffffffe530)
    at /home/dan/bzr/mir/toy/src/display_server.cpp:103
#13 0x0000000000406954 in run_mir (socket_file=...)
    at /home/dan/bzr/mir/toy/src/main.cpp:63
#14 main (argc=1, argv=0x7fffffffe638) at /home/dan/bzr/mir/toy/src/main.cpp:96