[FFmpeg-devel] [PR] avformat/mpegts: Check IOD_DESCRIPTOR len (PR #21562)

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

PR #21562 opened by michaelni
URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/21562
Patch URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/21562.patch

Fixes: out of array read
Fixes: VULN-7/poc.ts

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


>From d12cf5c7252a73c296f59eda09d853ebd5ee958b Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michael@niedermayer.cc>
Date: Fri, 23 Jan 2026 15:48:15 +0100
Subject: [PATCH] avformat/mpegts: Check IOD_DESCRIPTOR len

Fixes: out of array read
Fixes: VULN-7/poc.ts

Found-by: Zhenpeng (Leo) Lin from depthfirst
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 libavformat/mpegts.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavformat/mpegts.c b/libavformat/mpegts.c
index 7c19abaf76..dc8a0bd0a8 100644
--- a/libavformat/mpegts.c
+++ b/libavformat/mpegts.c
@@ -2524,7 +2524,7 @@ static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len
             // something else is broken, exit the program_descriptors_loop
             break;
         program_info_length -= len;
-        if (tag == IOD_DESCRIPTOR) {
+        if (tag == IOD_DESCRIPTOR && len >= 2) {
             get8(&p, p_end); // scope
             get8(&p, p_end); // label
             len -= 2;
-- 
2.52.0

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