File ffmpeg-4-CVE-2026-66039.patch of Package A_tw-ffmpeg-4

From aafb5c655edc76a753275c383ebb139feb032718 Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michael@niedermayer.cc>
Date: Mon, 29 Jun 2026 01:16:44 +0200
Subject: [PATCH] avcodec/mace: reject sample counts that overflow int

Fixes: heap buffer overflow
Fixes: FmXBI2dbgvgD
Fixes: 0eea212943544d40f99b05571aa7159d78667154 (Add avcodec_decode_audio4().)
Found-by: Adrian Junge (vurlo)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 libavcodec/mace.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

Index: ffmpeg-4.4.8/libavcodec/mace.c
===================================================================
--- ffmpeg-4.4.8.orig/libavcodec/mace.c
+++ ffmpeg-4.4.8/libavcodec/mace.c
@@ -252,7 +252,10 @@ static int mace_decode_frame(AVCodecCont
     }
 
     /* get output buffer */
-    frame->nb_samples = 3 * (buf_size << (1 - is_mace3)) / avctx->channels;
+    int64_t nb_samples = 3 * ((int64_t)buf_size << (1 - is_mace3)) / avctx->channels;
+    if (nb_samples > INT_MAX)
+        return AVERROR_INVALIDDATA;
+    frame->nb_samples = nb_samples;
     if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
         return ret;
     samples = (int16_t **)frame->extended_data;