[FFmpeg-cvslog] avformat/rdt: Check pkt_len

[Michael Niedermayer]

ffmpeg | branch: release/4.3 | Michael Niedermayer <michael at niedermayer.cc> | Fri Jun  7 01:50:00 2024 +0200| [0d1f7739046c14d664f0bcc9da3941a7f6d62ffd] | committer: Michael Niedermayer

avformat/rdt: Check pkt_len

Fixes: CID1473553 Untrusted loop bound

Sponsored-by: Sovereign Tech Fund
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit 0d0373de3bc6aa6fa5c71247191afccfaf20723d)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=0d1f7739046c14d664f0bcc9da3941a7f6d62ffd
---

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

diff --git a/libavformat/rdt.c b/libavformat/rdt.c
index 60c36f09e6..1250c9d70a 100644
--- a/libavformat/rdt.c
+++ b/libavformat/rdt.c
@@ -204,6 +204,8 @@ ff_rdt_parse_header(const uint8_t *buf, int len,
             return -1; /* not followed by a data packet */
 
         pkt_len = AV_RB16(buf+3);
+        if (pkt_len > len)
+            return AVERROR_INVALIDDATA;
         buf += pkt_len;
         len -= pkt_len;
         consumed += pkt_len;