diff options
| author | Dale Curtis <dalecurtis@chromium.org> | 2017-11-17 13:35:56 -0800 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2017-12-02 00:11:07 +0100 |
| commit | 6ecf356b4939e23e45a524f668447965d5c6229c (patch) | |
| tree | 6b1a7fff13efc8e01521ea8fbf78760ca47332c7 | |
| parent | ad780b0b9162a8e25e2915032078b6ef6ce72701 (diff) | |
| download | ffmpeg-6ecf356b4939e23e45a524f668447965d5c6229c.tar.gz | |
avformat/utils: Prevent undefined shift with wrap_bits > 64.
2LL << (wrap_bits=64 - 1) does not fit in int64_t; change the
code to use a uint64_t (2ULL) and add an av_assert2() to
ensure wrap_bits <= 64.
Signed-off-by: Dale Curtis <dalecurtis@chromium.org>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 03fbc0daa7e37af024f8b017a28105c32bbe25ca)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavformat/utils.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/libavformat/utils.c b/libavformat/utils.c index 52216e314f..71dde3da52 100644 --- a/libavformat/utils.c +++ b/libavformat/utils.c @@ -1437,13 +1437,14 @@ int av_read_frame(AVFormatContext *s, AVPacket *pkt) if (next_pkt->dts != AV_NOPTS_VALUE) { int wrap_bits = s->streams[next_pkt->stream_index]->pts_wrap_bits; + av_assert2(wrap_bits <= 64); // last dts seen for this stream. if any of packets following // current one had no dts, we will set this to AV_NOPTS_VALUE. int64_t last_dts = next_pkt->dts; while (pktl && next_pkt->pts == AV_NOPTS_VALUE) { if (pktl->pkt.stream_index == next_pkt->stream_index && - (av_compare_mod(next_pkt->dts, pktl->pkt.dts, 2LL << (wrap_bits - 1)) < 0)) { - if (av_compare_mod(pktl->pkt.pts, pktl->pkt.dts, 2LL << (wrap_bits - 1))) { + av_compare_mod(next_pkt->dts, pktl->pkt.dts, 2ULL << (wrap_bits - 1)) < 0) { + if (av_compare_mod(pktl->pkt.pts, pktl->pkt.dts, 2ULL << (wrap_bits - 1))) { // not B-frame next_pkt->pts = pktl->pkt.dts; } |