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asfdec: fix assert failure on invalid files 

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.

Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>
This commit is contained in:
Uoti Urpala 2011-04-24 07:21:30 +03:00 committed by Ronald S. Bultje
parent 0699dbb847
commit 0bd433a916
1 changed files with 4 additions and 0 deletions
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4
libavformat/asfdec.c
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@ -864,6 +864,10 @@ static int asf_read_frame_header(AVFormatContext *s, AVIOContext *pb){
}
//printf("Fragsize %d\n", asf->packet_frag_size);
} else {
if (rsize > asf->packet_size_left) {
av_log(s, AV_LOG_ERROR, "packet_replic_size is invalid\n");
return -1;
}
asf->packet_frag_size = asf->packet_size_left - rsize;
//printf("Using rest %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
}