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lavf: fix signed overflow in avformat_find_stream_info()

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On the first iteration through this code, last_dts is always
INT64_MIN (AV_NOPTS_VALUE) and the subtraction overflows in
an invalid manner.  Although the result is only used if the
input values are valid, performing the subtraction is still
not allowed in a strict environment.

Signed-off-by: Mans Rullgard <mans@mansr.com>
(cherry picked from commit a31e9f68a4)

Signed-off-by: Anton Khirnov <anton@khirnov.net>
This commit is contained in:
Mans Rullgard
2011-10-08 02:06:26 +01:00
committed by Reinhard Tartler
parent fdc669fcbb
commit 2c99aa48d7
1 changed files with 2 additions and 2 deletions
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4
libavformat/utils.c
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@@ -2356,9 +2356,9 @@ int avformat_find_stream_info(AVFormatContext *ic, AVDictionary **options)
}
{
int64_t last = st->info->last_dts;
int64_t duration= pkt->dts - last;
if(pkt->dts != AV_NOPTS_VALUE && last != AV_NOPTS_VALUE && duration>0){
if(pkt->dts != AV_NOPTS_VALUE && last != AV_NOPTS_VALUE && pkt->dts > last){
int64_t duration= pkt->dts - last;
double dur= duration * av_q2d(st->time_base);
// if(st->codec->codec_type == AVMEDIA_TYPE_VIDEO)