[FFmpeg-cvslog] avformat/sdp: Fix potential write beyond end of buffer

[Andreas Rheinhardt]

ffmpeg | branch: master | Andreas Rheinhardt <andreas.rheinhardt at gmail.com> | Tue Jul  7 21:50:33 2020 +0200| [5d91b7718efc581da8882a4e9bf2f5953e41adbf] | committer: Andreas Rheinhardt

avformat/sdp: Fix potential write beyond end of buffer

Reviewed-by: Michael Niedermayer <michael at niedermayer.cc>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt at gmail.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=5d91b7718efc581da8882a4e9bf2f5953e41adbf
---

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

diff --git a/libavformat/sdp.c b/libavformat/sdp.c
index 34e9839b67..2ce1a62262 100644
--- a/libavformat/sdp.c
+++ b/libavformat/sdp.c
@@ -212,7 +212,7 @@ static char *extradata2psets(AVFormatContext *s, AVCodecParameters *par)
         p += strlen(p);
         r = r1;
     }
-    if (sps && sps_end - sps >= 4) {
+    if (sps && sps_end - sps >= 4 && p - psets <= MAX_PSET_SIZE - strlen(profile_string) - 7) {
         memcpy(p, profile_string, strlen(profile_string));
         p += strlen(p);
         ff_data_to_hex(p, sps + 1, 3, 0);