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

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This prevents part of one exploit leading to an information leak

Found-by: Emil Lerner and Pavel Cheremushkin
Reported-by: Thierry Foucu <tfoucu@google.com>

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit a5d849b149)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2017-05-30 21:29:20 +02:00
parent c82db14411
commit 794bcc6eca
1 changed files with 3 additions and 0 deletions
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libavformat/avidec.c
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@ -1085,6 +1085,9 @@ 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;