avformat/mvdec: check av_strdup() return value

Signed-off-by: Steven Liu <lq@chinaffmpeg.org>

libavformat/mvdec.c

@@ -211,6 +211,8 @@ static int parse_video_var(AVFormatContext *avctx, AVStream *st,
     } else if (!strcmp(name, "ORIENTATION")) {
         if (var_read_int(pb, size) == 1101) {
             st->codecpar->extradata      = av_strdup("BottomUp");
+            if (!st->codecpar->extradata)
+                return AVERROR(ENOMEM);
             st->codecpar->extradata_size = 9;
         }
     } else if (!strcmp(name, "Q_SPATIAL") || !strcmp(name, "Q_TEMPORAL")) {