[FFmpeg-cvslog] avformat/utils: Prevent undefined shift with wrap_bits > 64.
Dale Curtis
git at videolan.org
Tue Jan 9 02:28:19 EET 2018
ffmpeg | branch: release/3.2 | Dale Curtis <dalecurtis at chromium.org> | Fri Nov 17 13:35:56 2017 -0800| [fc3e4c9ab300caa0bf8d95ae6c3fed8a22d488b0] | committer: Michael Niedermayer
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 at chromium.org>
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit 03fbc0daa7e37af024f8b017a28105c32bbe25ca)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=fc3e4c9ab300caa0bf8d95ae6c3fed8a22d488b0
---
libavformat/utils.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/libavformat/utils.c b/libavformat/utils.c
index 162eb5f4d2..4842d9be72 100644
--- a/libavformat/utils.c
+++ b/libavformat/utils.c
@@ -1710,13 +1710,14 @@ 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;
}
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