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avformat/utils: Never store negative values in last_IP_duration 

Fixes: integer overflow compute_pkt_fields()
Fixes: compute_pkt_usan

Reported-by: Thomas Guilbert <tguilbert@chromium.org>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 079d1a7175)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2018-10-12 20:55:25 +02:00
parent 51404bb4f6
commit 6a5b0a3c75
1 changed files with 3 additions and 2 deletions
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5
libavformat/utils.c
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@ -1157,7 +1157,7 @@ static void compute_pkt_fields(AVFormatContext *s, AVStream *st,
/* This is tricky: the dts must be incremented by the duration
* of the frame we are displaying, i.e. the last I- or P-frame. */
if (st->last_IP_duration == 0)
if (st->last_IP_duration == 0 && (uint64_t)pkt->duration <= INT32_MAX)
st->last_IP_duration = pkt->duration;
if (pkt->dts != AV_NOPTS_VALUE)
st->cur_dts = pkt->dts + st->last_IP_duration;
@ -1169,7 +1169,8 @@ static void compute_pkt_fields(AVFormatContext *s, AVStream *st,
next_pts != AV_NOPTS_VALUE)
pkt->pts = next_dts;
st->last_IP_duration = pkt->duration;
if ((uint64_t)pkt->duration <= INT32_MAX)
st->last_IP_duration = pkt->duration;
st->last_IP_pts = pkt->pts;
/* Cannot compute PTS if not present (we can compute it only
* by knowing the future. */