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avformat/avidec: Limit formats in gab2 to srt and ass/ssa

This prevents part of one exploit leading to an information leak

Found-by: Emil Lerner and Pavel Cheremushkin
Reported-by: Thierry Foucu <>

Signed-off-by: Michael Niedermayer <>
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Michael Niedermayer
Michael Niedermayer committed May 30, 2017
1 parent 78f6ec3 commit a5d849b149ca67ced2d271dc84db0bc95a548abb
Showing with 3 additions and 0 deletions.
  1. +3 −0 libavformat/avidec.c
@@ -1099,6 +1099,9 @@ static int read_gab2_sub(AVFormatContext *s, AVStream *st, AVPacket *pkt)
if (!sub_demuxer)
goto error;

if (strcmp(sub_demuxer->name, "srt") && strcmp(sub_demuxer->name, "ass"))
goto error;

if (!(ast->sub_ctx = avformat_alloc_context()))
goto error;

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