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png/ico decoder: Don't try reading beyond the file

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This fixes oss-fuzz issue 44955.

Pick-to: 6.2 6.3
Change-Id: Ie74ae037630f83e64fd0678ff2eac579f35d02b8
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Eirik Aavitsland <eirik.aavitsland@qt.io>
This commit is contained in:
Robert Löhning 2022-02-25 20:26:59 +01:00
parent 38a86afcc4
commit 27fae7207f
1 changed files with 4 additions and 2 deletions
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6
src/plugins/imageformats/ico/qicohandler.cpp
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@ -1,6 +1,6 @@
/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Copyright (C) 2022 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the plugins of the Qt Toolkit.
@ -466,7 +466,9 @@ QImage ICOReader::iconAt(int index)
static const uchar pngMagicData[] = { 137, 80, 78, 71, 13, 10, 26, 10 };
iod->seek(iconEntry.dwImageOffset);
if (!iod->seek(iconEntry.dwImageOffset)
|| iconEntry.dwBytesInRes > iod->bytesAvailable())
return img;
const QByteArray pngMagic = QByteArray::fromRawData((const char*)pngMagicData, sizeof(pngMagicData));
const bool isPngImage = (iod->read(pngMagic.size()) == pngMagic);