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probe_codec: fix memory corruption

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Found-by: Tanami Ohad
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2012-07-26 01:05:01 +02:00
parent 6bf87785e8
commit 9054f6b66b
1 changed files with 5 additions and 1 deletions
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6
libavformat/utils.c
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@ -680,11 +680,15 @@ static void probe_codec(AVFormatContext *s, AVStream *st, const AVPacket *pkt)
--st->probe_packets;
if (pkt) {
pd->buf = av_realloc(pd->buf, pd->buf_size+pkt->size+AVPROBE_PADDING_SIZE);
uint8_t *new_buf = av_realloc(pd->buf, pd->buf_size+pkt->size+AVPROBE_PADDING_SIZE);
if(!new_buf)
goto no_packet;
pd->buf = new_buf;
memcpy(pd->buf+pd->buf_size, pkt->data, pkt->size);
pd->buf_size += pkt->size;
memset(pd->buf+pd->buf_size, 0, AVPROBE_PADDING_SIZE);
} else {
no_packet:
st->probe_packets = 0;
}