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The `fail_rx`/`fail` block is only entered while `buf_rx` is equal to its initial value `MAP_FAILED`. The `munmap(buf_rx, size);` was never executed. Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2030 Signed-off-by: Samuel Tardieu <sam@rfc1149.net> Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Message-Id: <20231219182212.455952-2-sam@rfc1149.net> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>