From: Christian Brabandt <cb@256bit.org>
Date: Sat, 21 Feb 2026 10:50:20 +0000 (+0000)
Subject: patch 9.2.0039: potential integer underflow in screen_line()
X-Git-Tag: v9.2.0039^0
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=402eb5b5a6de2b16824eeefa7c4ef8cfd565a7d5;p=thirdparty%2Fvim.git

patch 9.2.0039: potential integer underflow in screen_line()

Problem:  In screen_line(), there is a potential integer underflow when
          accessing ScreenAttrs[off_to - 1] if off_to is zero.
          (Coverity CID 1681430, after v9.2.0017)
Solution: Add a check to ensure off_to > 0 before accessing the
          previous attribute index.

related: #19272
closes:  #19479

Signed-off-by: Christian Brabandt <cb@256bit.org>
---

diff --git a/src/screen.c b/src/screen.c
index 6e6f11b70b..b3fe3705e0 100644
--- a/src/screen.c
+++ b/src/screen.c
@@ -848,7 +848,7 @@ skip_opacity:
 #ifdef FEAT_GUI
 		&& !gui.in_use
 #endif
-		&& col + coloff > 0)
+		&& col + coloff > 0 && off_to > 0)
 	{
 	    if (ScreenAttrs[off_to] == ScreenAttrs[off_to - 1])
 	    {
diff --git a/src/version.c b/src/version.c
index 871f3b2392..336ac8894f 100644
--- a/src/version.c
+++ b/src/version.c
@@ -734,6 +734,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    39,
 /**/
     38,
 /**/