[FFmpeg-devel] [PATCH 1/3] mlvdec: check that index_entries exist

Andreas Cadhalpun andreas.cadhalpun at googlemail.com
Sat Dec 19 23:47:54 CET 2015


This fixes NULL pointer dereferencing.

Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun at googlemail.com>
---
 libavformat/mlvdec.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/libavformat/mlvdec.c b/libavformat/mlvdec.c
index 48a429e..4b3bdc1 100644
--- a/libavformat/mlvdec.c
+++ b/libavformat/mlvdec.c
@@ -365,6 +365,11 @@ static int read_header(AVFormatContext *avctx)
     if (ast)
         ast->duration = ast->nb_index_entries;
 
+    if ((vst && !vst->nb_index_entries) || (ast && !ast->nb_index_entries)) {
+        av_log(avctx, AV_LOG_ERROR, "no index entries found\n");
+        return AVERROR_INVALIDDATA;
+    }
+
     if (vst && ast)
         avio_seek(pb, FFMIN(vst->index_entries[0].pos, ast->index_entries[0].pos), SEEK_SET);
     else if (vst)
-- 
2.6.2


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