From 440a87948e66c392ff9d664964ea6f6953959dc6 Mon Sep 17 00:00:00 2001
From: Kostya Shishkov <kostya.shishkov@gmail.com>
Date: Tue, 10 Aug 2021 12:54:57 +0200
Subject: [PATCH] smc: fix repeat-two-blocks case

---
 nihav-qt/src/codecs/smc.rs | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/nihav-qt/src/codecs/smc.rs b/nihav-qt/src/codecs/smc.rs
index 401b3c4..5364b08 100644
--- a/nihav-qt/src/codecs/smc.rs
+++ b/nihav-qt/src/codecs/smc.rs
@@ -119,7 +119,8 @@ impl NADecoder for SmcDecoder {
                     llblock = lblock;
                 },
                 2 => {
-                    for i in 0..len {
+                    validate!(blockpos + len * 2 <= nblocks);
+                    for i in 0..len*2 {
                         if (i & 1) == 0 {
                             Self::put_block(&mut frm.data[doff + x..], stride, &llblock);
                         } else {
@@ -131,6 +132,7 @@ impl NADecoder for SmcDecoder {
                             doff += stride * 4;
                         }
                     }
+                    blockpos += len;
                 },
                 3 => {
                     let clr             = br.read_byte()?;
-- 
2.30.2