[FFmpeg-devel] [PR] avformat/yuv4mpegen: Sanity check input packet frame dimensions (PR #21552)

[michaelni via ffmpeg-devel <ffmpeg-devel@ffmpeg.org>]

PR #21552 opened by michaelni
URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/21552
Patch URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/21552.patch

Fixes: out of array access if a filter-graph is used the injects changing dimensions

Found-by: Zhenpeng (Leo) Lin from depthfirst
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>


>From 2ac2f8eba4d5bdcbe00c937373858f7b1b79aaea Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michael@niedermayer.cc>
Date: Fri, 23 Jan 2026 02:09:02 +0100
Subject: [PATCH] avformat/yuv4mpegen: Sanity check input packet frame
 dimensions

Fixes: out of array access if a filter-graph is used the injects changing dimensions

Found-by: Zhenpeng (Leo) Lin from depthfirst
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 libavformat/yuv4mpegenc.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libavformat/yuv4mpegenc.c b/libavformat/yuv4mpegenc.c
index 371d3745c1..493ddd1e38 100644
--- a/libavformat/yuv4mpegenc.c
+++ b/libavformat/yuv4mpegenc.c
@@ -197,6 +197,9 @@ static int yuv4_write_packet(AVFormatContext *s, AVPacket *pkt)
 
     width  = st->codecpar->width;
     height = st->codecpar->height;
+    if (frame->width != width || frame->height != height)
+        return AVERROR(EINVAL);
+
     desc   = av_pix_fmt_desc_get(st->codecpar->format);
 
     /* The following code presumes all planes to be non-interleaved. */
-- 
2.52.0

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