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rtp: Fix integer underflow that could allow remote code execution. 

Fixes MSVR-11-0088
Credit:  Jeong Wook Oh of Microsoft and Microsoft Vulnerability Research (MSVR)
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2011-09-07 14:12:42 +02:00
parent 3961695b7f
commit ba9a7e0d71
1 changed files with 2 additions and 0 deletions
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2
libavformat/rtpdec_asf.c
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@ -235,6 +235,8 @@ static int asfrtp_parse_packet(AVFormatContext *s, PayloadContext *asf,
int prev_len = out_len; int prev_len = out_len;
out_len += cur_len; out_len += cur_len;
asf->buf = av_realloc(asf->buf, out_len); asf->buf = av_realloc(asf->buf, out_len);
if(!asf->buf || FFMIN(cur_len, len - off)<0)
return -1;
memcpy(asf->buf + prev_len, buf + off, memcpy(asf->buf + prev_len, buf + off,
FFMIN(cur_len, len - off)); FFMIN(cur_len, len - off));
avio_skip(pb, cur_len); avio_skip(pb, cur_len);