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mlvdec: check that index_entries exist

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This fixes NULL pointer dereferencing.

Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>
This commit is contained in:
Andreas Cadhalpun 2015-12-19 23:44:53 +01:00
parent 70f13abb4f
commit 9fcfe4a3cd
1 changed files with 5 additions and 0 deletions
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5
libavformat/mlvdec.c
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@ -365,6 +365,11 @@ static int read_header(AVFormatContext *avctx)
if (ast) if (ast)
ast->duration = ast->nb_index_entries; 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) if (vst && ast)
avio_seek(pb, FFMIN(vst->index_entries[0].pos, ast->index_entries[0].pos), SEEK_SET); avio_seek(pb, FFMIN(vst->index_entries[0].pos, ast->index_entries[0].pos), SEEK_SET);
else if (vst) else if (vst)