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asfdec: fix assert failure on invalid files

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Add an extra size validity check in asf_read_frame_header(). Without
this asf->packet_size_left may become negative, which triggers an
assertion failure later.
This commit is contained in:
Uoti Urpala 2011-04-24 07:21:30 +03:00 committed by Michael Niedermayer
parent 10291562f3
commit bcedf2e519
1 changed files with 4 additions and 0 deletions
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4
libavformat/asfdec.c
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@ -842,6 +842,10 @@ static int asf_read_frame_header(AVFormatContext *s, AVIOContext *pb){
av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n", asf->packet_replic_size);
return -1;
}
if (rsize > asf->packet_size_left) {
av_log(s, AV_LOG_ERROR, "packet_replic_size is invalid\n");
return -1;
}
if (asf->packet_flags & 0x01) {
DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
if(asf->packet_frag_size > asf->packet_size_left - rsize){