From aeec93483900e6e276b5dc8864f7bf13eaab9654 Mon Sep 17 00:00:00 2001
From: Albert Astals Cid <aacid@kde.org>
Date: Fri, 8 Feb 2019 23:26:11 +0100
Subject: [PATCH] xcf: Fix uninitialized memory use on broken documents

oss-fuzz/12871
---
 src/imageformats/xcf.cpp | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/imageformats/xcf.cpp b/src/imageformats/xcf.cpp
index cdbcfba..a12aab0 100644
--- a/src/imageformats/xcf.cpp
+++ b/src/imageformats/xcf.cpp
@@ -1063,6 +1063,13 @@ bool XCFImageFormat::loadLevel(QDataStream &xcf_io, Layer &layer, qint32 bpp)
     xcf_io >> width >> height >> offset;
 
     if (offset == 0) {
+        // offset 0 with rowsxcols != 0 is probably an error since it means we have tiles
+        // without data but just clear the bits for now instead of returning false
+        for (uint j = 0; j < layer.nrows; j++) {
+            for (uint i = 0; i < layer.ncols; i++) {
+                layer.image_tiles[j][i].fill(Qt::transparent);
+            }
+        }
         return true;
     }