[FFmpeg-cvslog] avformat/mxfdec: Check count in mxf_read_strong_ref_array()

[Michael Niedermayer]

ffmpeg | branch: release/4.4 | Michael Niedermayer <michael at niedermayer.cc> | Sun Mar 13 00:34:52 2022 +0100| [2a549b2e7d9f3edd4744afe288fcb012daee4a1e] | committer: Michael Niedermayer

avformat/mxfdec: Check count in mxf_read_strong_ref_array()

Reviewed-by: Tomas Härdin <tjoppen at acc.umu.se>
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit 3015c556f316d4ab364ed55e8bc97cc0f2cc57a3)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=2a549b2e7d9f3edd4744afe288fcb012daee4a1e
---

 libavformat/mxfdec.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/libavformat/mxfdec.c b/libavformat/mxfdec.c
index 84ab0cefd7..ba7466f960 100644
--- a/libavformat/mxfdec.c
+++ b/libavformat/mxfdec.c
@@ -875,7 +875,13 @@ static int mxf_read_cryptographic_context(void *arg, AVIOContext *pb, int tag, i
 
 static int mxf_read_strong_ref_array(AVIOContext *pb, UID **refs, int *count)
 {
-    *count = avio_rb32(pb);
+    unsigned c = avio_rb32(pb);
+
+    //avio_read() used int
+    if (c > INT_MAX / sizeof(UID))
+        return AVERROR_PATCHWELCOME;
+    *count = c;
+
     av_free(*refs);
     *refs = av_calloc(*count, sizeof(UID));
     if (!*refs) {