From acd6b3970c96ed7f4e0ed6ab2f0abb63bef304a8 Mon Sep 17 00:00:00 2001
From: Albert Astals Cid <aacid@kde.org>
Date: Tue, 23 Jul 2024 00:22:08 +0200
Subject: [PATCH] pcx: fix crash on invalid files

---
 src/imageformats/pcx.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/imageformats/pcx.cpp b/src/imageformats/pcx.cpp
index a5d283d..22bce91 100644
--- a/src/imageformats/pcx.cpp
+++ b/src/imageformats/pcx.cpp
@@ -375,7 +375,8 @@ static bool readImage4v2(QImage &img, QDataStream &s, const PCXHEADER &header)
             return false;
         }
 
-        for (unsigned int x = 0; x < header.BytesPerLine; ++x) {
+        const unsigned int bpl = std::min(header.BytesPerLine, static_cast<quint16>(header.width() / 2));
+        for (unsigned int x = 0; x < bpl; ++x) {
             p[x * 2] = (buf[x] & 240) >> 4;
             p[x * 2 + 1] = buf[x] & 15;
         }