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avcodec/dvdsub_parser: Check buf_size before reading 32bit packet size
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
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@ -45,8 +45,9 @@ static int dvdsub_parse(AVCodecParserContext *s,
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DVDSubParseContext *pc = s->priv_data;
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if (pc->packet_index == 0) {
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if (buf_size < 2)
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if (buf_size < 2 || AV_RB16(buf) && buf_size < 6) {
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return buf_size;
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}
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pc->packet_len = AV_RB16(buf);
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if (pc->packet_len == 0) /* HD-DVD subpicture packet */
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pc->packet_len = AV_RB32(buf+2);
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