From eae41980b22915328bac1fa4193c6aaaa01f0ead Mon Sep 17 00:00:00 2001
From: Albert Astals Cid <aacid@kde.org>
Date: Sun, 7 Sep 2025 00:38:05 +0200
Subject: [PATCH] dds: Fix assert when reading broken data

oss-fuzz testcase 6027629841154048
---
 src/imageformats/dds.cpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/imageformats/dds.cpp b/src/imageformats/dds.cpp
index acedbd0..617514c 100644
--- a/src/imageformats/dds.cpp
+++ b/src/imageformats/dds.cpp
@@ -1126,7 +1126,11 @@ static QImage readR32F(QDataStream &s, const quint32 width, const quint32 height
     for (quint32 y = 0; y < height; y++) {
         float *line = reinterpret_cast<float *>(image.scanLine(y));
         for (quint32 x = 0; x < width; x++) {
-            line[x * 4] = readFloat32(s);
+            const float f = readFloat32(s);
+            if (std::isnan(f)) {
+                return {};
+            }
+            line[x * 4] = f;
             line[x * 4 + 1] = 0;
             line[x * 4 + 2] = 0;
             line[x * 4 + 3] = 1;