ffserver: prevent nb_streams from becoming too large

Fixes CID732249

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit 0f46825d98)

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

ffserver.c

@@ -3457,6 +3457,9 @@ static AVStream *add_av_stream1(FFStream *stream, AVCodecContext *codec, int cop
 {
     AVStream *fst;
 
+    if(stream->nb_streams >= FF_ARRAY_ELEMS(stream->streams))
+        return NULL;
+
     fst = av_mallocz(sizeof(AVStream));
     if (!fst)
         return NULL;
@@ -3802,6 +3805,9 @@ static void add_codec(FFStream *stream, AVCodecContext *av)
 {
     AVStream *st;
 
+    if(stream->nb_streams >= FF_ARRAY_ELEMS(stream->streams))
+        return NULL;
+
     /* compute default parameters */
     switch(av->codec_type) {
     case AVMEDIA_TYPE_AUDIO: