[FFmpeg-devel] [PATCH] avformat/sctp: Check size in sctp_write() (PR #20809)

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

PR #20809 opened by michaelni
URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/20809
Patch URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/20809.patch

Fixes: out of array access
No testcase

Found-by: Joshua Rogers <joshua@joshua.hu> with ZeroPath
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>


>From e124c1f611e45eda94192afbdb6d0d36747892e9 Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michael@niedermayer.cc>
Date: Fri, 31 Oct 2025 23:08:45 +0100
Subject: [PATCH] avformat/sctp: Check size in sctp_write()

Fixes: out of array access
No testcase

Found-by: Joshua Rogers <joshua@joshua.hu> with ZeroPath
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 libavformat/sctp.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libavformat/sctp.c b/libavformat/sctp.c
index 4122fbe312..9a6b991803 100644
--- a/libavformat/sctp.c
+++ b/libavformat/sctp.c
@@ -332,6 +332,9 @@ static int sctp_write(URLContext *h, const uint8_t *buf, int size)
     }
 
     if (s->max_streams) {
+        if (size < 2)
+            return AVERROR(EINVAL);
+
         /*StreamId is introduced as a 2byte code into the stream*/
         struct sctp_sndrcvinfo info = { 0 };
         info.sinfo_stream           = AV_RB16(buf);
-- 
2.49.1

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