[FFmpeg-cvslog] avformat/thp: Check fps

[Michael Niedermayer]

ffmpeg | branch: release/4.3 | Michael Niedermayer <michael at niedermayer.cc> | Mon Jun  8 09:28:55 2020 +0200| [838e17ffec4b1cc930cd89228e88ee8db1b52dcb] | committer: Michael Niedermayer

avformat/thp: Check fps

Fixes: division by zero
Fixes: 23162/clusterfuzz-testcase-minimized-ffmpeg_DEMUXER_fuzzer-4856420817436672

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 0e15b01b4e463d12128db2c15de7741637548347)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=838e17ffec4b1cc930cd89228e88ee8db1b52dcb
---

 libavformat/thp.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libavformat/thp.c b/libavformat/thp.c
index 4abff1313a..bcc3febaa1 100644
--- a/libavformat/thp.c
+++ b/libavformat/thp.c
@@ -75,6 +75,8 @@ static int thp_read_header(AVFormatContext *s)
                            avio_rb32(pb); /* Max samples.  */
 
     thp->fps             = av_d2q(av_int2float(avio_rb32(pb)), INT_MAX);
+    if (thp->fps.den <= 0 || thp->fps.num < 0)
+        return AVERROR_INVALIDDATA;
     thp->framecnt        = avio_rb32(pb);
     thp->first_framesz   = avio_rb32(pb);
     pb->maxsize          = avio_rb32(pb);