[FFmpeg-devel] [PATCH 2/3] avformat/sdp: Check before appending ", "

From: Michael Niedermayer <michael@niedermayer.cc>
To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org>
Subject: [FFmpeg-devel] [PATCH 2/3] avformat/sdp: Check before appending ", "
Date: Wed,  8 May 2024 04:39:22 +0200
Message-ID: <20240508023923.28209-2-michael@niedermayer.cc> (raw)
In-Reply-To: <20240508023923.28209-1-michael@niedermayer.cc>

Found by reviewing code related to CID1500301 String not null terminated

Sponsored-by: Sovereign Tech Fund
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 libavformat/sdp.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libavformat/sdp.c b/libavformat/sdp.c
index 7e11a759185..ccfaa8aff58 100644
--- a/libavformat/sdp.c
+++ b/libavformat/sdp.c
@@ -203,6 +203,8 @@ static int extradata2psets(AVFormatContext *s, const AVCodecParameters *par,
             continue;
         }
         if (p != (psets + strlen(pset_string))) {
+            if (p - psets >= MAX_PSET_SIZE)
+                goto fail_in_loop;
             *p = ',';
             p++;
         }
@@ -213,6 +215,7 @@ static int extradata2psets(AVFormatContext *s, const AVCodecParameters *par,
         if (!av_base64_encode(p, MAX_PSET_SIZE - (p - psets), r, r1 - r)) {
             av_log(s, AV_LOG_ERROR, "Cannot Base64-encode %"PTRDIFF_SPECIFIER" %"PTRDIFF_SPECIFIER"!\n",
                    MAX_PSET_SIZE - (p - psets), r1 - r);
+fail_in_loop:
             av_free(psets);
             av_free(tmpbuf);
 
-- 
2.43.2

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