[FFmpeg-cvslog] lavf/rtpdec: fix RTCP SR packet length check

[Marvin Scholz]

ffmpeg | branch: master | Marvin Scholz <epirat07 at gmail.com> | Thu Apr 24 20:36:52 2025 +0200| [e0abe0a02a6963955f1463d32c441fa22c1673a7] | committer: Marvin Scholz

lavf/rtpdec: fix RTCP SR packet length check

The minimum valid packet length is 28, given that the length includes
the packet header.

This didn't cause any issues so far as the code did not care about the
last two fields in the SR section, but will be relevant in a future
commit.

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=e0abe0a02a6963955f1463d32c441fa22c1673a7
---

 libavformat/rtpdec.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavformat/rtpdec.c b/libavformat/rtpdec.c
index d54ac31eb0..5aecf7fbc7 100644
--- a/libavformat/rtpdec.c
+++ b/libavformat/rtpdec.c
@@ -187,7 +187,7 @@ static int rtcp_parse_packet(RTPDemuxContext *s, const unsigned char *buf,
 
         switch (buf[1]) {
         case RTCP_SR:
-            if (payload_len < 20) {
+            if (payload_len < 28) {
                 av_log(s->ic, AV_LOG_ERROR, "Invalid RTCP SR packet length\n");
                 return AVERROR_INVALIDDATA;
             }