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If you pass sendto() a NULL buffer, this is usually an error (causing an EFAULT return); however if you pass a 0 length then we should not try to validate the buffer provided. Instead we skip the copying of the user data and possible processing through fd_trans_target_to_host_data, and call the host syscall with NULL, 0. (unlock_user() permits a NULL buffer pointer for "do nothing" so we don't need to special case the unlock code.) Cc: qemu-stable@nongnu.org Resolves: https://gitlab.com/qemu-project/qemu/-/issues/3102 Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Michael Tokarev <mjt@tls.msk.ru> Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Message-ID: <20251028142001.3011630-1-peter.maydell@linaro.org>