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ui/spice-display: Avoid dynamic stack allocation
Use an autofree heap allocation instead of a variable-length array on the stack in qemu_spice_create_update(). The codebase has very few VLAs, and if we can get rid of them all we can make the compiler error on new additions. This is a defensive measure against security bugs where an on-stack dynamic allocation isn't correctly size-checked (e.g. CVE-2021-3527). Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org> Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com> Message-Id: <20230818151057.1541189-2-peter.maydell@linaro.org>
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