avformat/asfdec: Fix DoS in asf_build_simple_index()

Fixes: Missing EOF check in loop No testcase Found-by: Xiaohei and Wangchu from Alibaba Security Team Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
FFmpeg · Sep 7, 2017 · afc9c68 · afc9c68 · fgeek · Sep 9, 2017
1 parent 9cb4eb7
commit afc9c68
Showing 1 changed file with 5 additions and 0 deletions.
diff --git a/libavformat/asfdec_f.c b/libavformat/asfdec_f.c
@@ -1610,6 +1610,11 @@ static int asf_build_simple_index(AVFormatContext *s, int stream_index)
             int64_t pos       = s->internal->data_offset + s->packet_size * (int64_t)pktnum;
             int64_t index_pts = FFMAX(av_rescale(itime, i, 10000) - asf->hdr.preroll, 0);
 
+            if (avio_feof(s->pb)) {
+                ret = AVERROR_INVALIDDATA;
+                goto end;
+            }
+
             if (pos != last_pos) {
                 av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d  pts: %"PRId64"\n",
                        pktnum, pktct, index_pts);