From: Kostya Shishkov <kostya.shishkov@gmail.com>
Date: Sat, 4 Apr 2020 10:27:55 +0000 (+0200)
Subject: codec_support/h263: validate that B-frame has enough reference data
X-Git-Url: https://git.nihav.org/?p=nihav.git;a=commitdiff_plain;h=df05c4383da3fc259763db9b905dff548e74e2be

codec_support/h263: validate that B-frame has enough reference data
---

diff --git a/nihav-codec-support/src/codecs/h263/decoder.rs b/nihav-codec-support/src/codecs/h263/decoder.rs
index 7a88882..02d6075 100644
--- a/nihav-codec-support/src/codecs/h263/decoder.rs
+++ b/nihav-codec-support/src/codecs/h263/decoder.rs
@@ -213,6 +213,10 @@ impl H263BaseDecoder {
         }
         let is_b = pinfo.mode == Type::B;
 
+        if is_b && (self.mv_data.len() < self.mb_w * self.mb_h) {
+            return Err(DecoderError::MissingReference);
+        }
+
         let tsdiff = if pinfo.is_pb() { pinfo.ts.wrapping_sub(self.last_ts) >> 1 }
                      else { self.last_ts.wrapping_sub(self.next_ts) >> 1 };
         let bsdiff = if pinfo.is_pb() { (pinfo.get_pbinfo().get_trb() as u16) << 7 }