[FFmpeg-cvslog] avformat/realtextdec: Check the pts difference before using it for the duration computation

[Michael Niedermayer]

ffmpeg | branch: release/4.4 | Michael Niedermayer <michael at niedermayer.cc> | Sun Apr 25 20:45:10 2021 +0200| [de255793d2800822a2cfc13e30a865824daed51f] | committer: Michael Niedermayer

avformat/realtextdec: Check the pts difference before using it for the duration computation

Fixes: signed integer overflow: 5404200000 - -9223372031709351616 cannot be represented in type 'long'
Fixes: 29102/clusterfuzz-testcase-minimized-ffmpeg_dem_REALTEXT_fuzzer-6737340551790592

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit fe12aa689003db9b07a6e1b837031dcc57a71435)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=de255793d2800822a2cfc13e30a865824daed51f
---

 libavformat/realtextdec.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/libavformat/realtextdec.c b/libavformat/realtextdec.c
index f534774420..368a741240 100644
--- a/libavformat/realtextdec.c
+++ b/libavformat/realtextdec.c
@@ -111,10 +111,11 @@ static int realtext_read_header(AVFormatContext *s)
             if (!merge) {
                 const char *begin = ff_smil_get_attr_ptr(buf.str, "begin");
                 const char *end   = ff_smil_get_attr_ptr(buf.str, "end");
+                int64_t endi = end ? read_ts(end) : 0;
 
                 sub->pos      = pos;
                 sub->pts      = begin ? read_ts(begin) : 0;
-                sub->duration = end ? (read_ts(end) - sub->pts) : duration;
+                sub->duration = (end && endi > sub->pts && endi - (uint64_t)sub->pts <= INT64_MAX) ? endi - sub->pts : duration;
             }
         }
         av_bprint_clear(&buf);