From 129fd21687fbd4ac48133b7abfdcaf52cb6cb01f Mon Sep 17 00:00:00 2001
From: Jennifer Zhao <jenniferz@openai.com>
Date: Wed, 9 Sep 2026 05:47:49 +0000
Subject: [PATCH] Reject empty audio payloads in data URLs (#44070)

Return `AudioPreparationError::InvalidDataUrl` with the reason
`audio payload is empty` when the decoded base64 payload is empty.

GitOrigin-RevId: e886dab5f49ebb1a363dbc1c292813b2b52698d4
---
 codex-rs/utils/audio/src/lib.rs | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/codex-rs/utils/audio/src/lib.rs b/codex-rs/utils/audio/src/lib.rs
index a68db32878..53567952e0 100644
--- a/codex-rs/utils/audio/src/lib.rs
+++ b/codex-rs/utils/audio/src/lib.rs
@@ -246,6 +246,11 @@ fn prepare_audio(audio_url: &mut String) -> Result<(), AudioPreparationError> {
             .map_err(|_| AudioPreparationError::InvalidDataUrl {
                 reason: "invalid base64 payload",
             })?;
+    if bytes.is_empty() {
+        return Err(AudioPreparationError::InvalidDataUrl {
+            reason: "audio payload is empty",
+        });
+    }
     if bytes.len() > MAX_PROMPT_AUDIO_INPUT_BYTES {
         return Err(AudioPreparationError::AudioTooLarge { size: bytes.len() });
     }