mp4: Don't read an empty Decoder Config Descriptor

14 years ago · 1c2e07b811
parent 20e1829dad
commit 1c2e07b811
1 changed files with 1 additions and 1 deletions
--- a/libavformat/isom.c
+++ b/libavformat/isom.c
@ -418,7 +418,7 @@ int ff_mp4_read_dec_config_descr(AVFormatContext *fc, AVStream *st, AVIOContext
    len = ff_mp4_read_descr(fc, pb, &tag);
    if (tag == MP4DecSpecificDescrTag) {
        av_dlog(fc, "Specific MPEG4 header len=%d\n", len);
-        if((uint64_t)len > (1<<30))
+        if (!len || (uint64_t)len > (1<<30))
            return -1;
        av_free(st->codec->extradata);
        st->codec->extradata = av_mallocz(len + FF_INPUT_BUFFER_PADDING_SIZE);