* [FFmpeg-devel] [PR] avformat/img2enc: Check split planes packet size (PR #21551)
@ 2026-01-23 2:48 michaelni via ffmpeg-devel
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From: michaelni via ffmpeg-devel @ 2026-01-23 2:48 UTC (permalink / raw)
To: ffmpeg-devel; +Cc: michaelni
PR #21551 opened by michaelni
URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/21551
Patch URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/21551.patch
Fixes: out of array read
Fixes: VULN-6/poc.raw
Found-by: Zhenpeng (Leo) Lin from depthfirst
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
>From a2d94c8f0a569c682fe98eae4d359c0e00155713 Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michael@niedermayer.cc>
Date: Fri, 23 Jan 2026 00:34:56 +0100
Subject: [PATCH] avformat/img2enc: Check split planes packet size
Fixes: out of array read
Fixes: VULN-6/poc.raw
Found-by: Zhenpeng (Leo) Lin from depthfirst
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
libavformat/img2enc.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/libavformat/img2enc.c b/libavformat/img2enc.c
index 62ec5be64b..b11f62d85d 100644
--- a/libavformat/img2enc.c
+++ b/libavformat/img2enc.c
@@ -217,6 +217,11 @@ static int write_packet(AVFormatContext *s, AVPacket *pkt)
ysize *= 2;
usize *= 2;
}
+ if (ysize + 2*usize + (desc->nb_components > 3) * ysize > pkt->size) {
+ ret = AVERROR(EINVAL);
+ goto fail;
+ }
+
if ((ret = write_and_close(s, &pb[0], pkt->data , ysize)) < 0 ||
(ret = write_and_close(s, &pb[1], pkt->data + ysize , usize)) < 0 ||
(ret = write_and_close(s, &pb[2], pkt->data + ysize + usize, usize)) < 0)
--
2.52.0
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2026-01-23 2:48 [FFmpeg-devel] [PR] avformat/img2enc: Check split planes packet size (PR #21551) michaelni via ffmpeg-devel
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