File 0004-Check-returns-of-hex2int-in-get_hex_rgb.patch of Package libqt5-qtbase.29898
From 17457fc6c6f61b25302f93759f18b5d0b0816128 Mon Sep 17 00:00:00 2001
From: Robert Loehning <robert.loehning@qt.io>
Date: Wed, 8 Jul 2020 19:32:48 +0200
Subject: [PATCH 04/11] Check returns of hex2int in get_hex_rgb
Avoids undefined behavior when trying to shift negative values.
Fixes: oss-fuzz-21860
Fixes: oss-fuzz-23968
Change-Id: I879c97624e3f8ba9cf01e0a3a682379cd8c4a199
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
(cherry picked from commit 3094bcc3c5a30635289f534884965d39ac35a11a)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
(cherry picked from commit df65a30d5c13174600ce8bdd9347bca37cf1e77b)
---
src/gui/painting/qcolor.cpp | 2 ++
tests/auto/gui/painting/qcolor/tst_qcolor.cpp | 3 +++
2 files changed, 5 insertions(+)
diff --git a/src/gui/painting/qcolor.cpp b/src/gui/painting/qcolor.cpp
index e5bac84df9..858eba4621 100644
--- a/src/gui/painting/qcolor.cpp
+++ b/src/gui/painting/qcolor.cpp
@@ -88,6 +88,8 @@ static bool get_hex_rgb(const char *name, size_t len, QRgba64 *rgb)
r = hex2int(name + 0, 3);
g = hex2int(name + 3, 3);
b = hex2int(name + 6, 3);
+ if (r == -1 || g == -1 || b == -1)
+ return false;
r = (r << 4) | (r >> 8);
g = (g << 4) | (g >> 8);
b = (b << 4) | (b >> 8);
diff --git a/tests/auto/gui/painting/qcolor/tst_qcolor.cpp b/tests/auto/gui/painting/qcolor/tst_qcolor.cpp
index 17289e0b85..f5bfa683d6 100644
--- a/tests/auto/gui/painting/qcolor/tst_qcolor.cpp
+++ b/tests/auto/gui/painting/qcolor/tst_qcolor.cpp
@@ -324,6 +324,9 @@ void tst_QColor::namehex_data()
QTest::newRow("transparent red") << "#66ff0000" << QColor(255, 0, 0, 102);
QTest::newRow("invalid red") << "#gg0000" << QColor();
QTest::newRow("invalid transparent") << "#gg00ff00" << QColor();
+ // when configured with "-sanitize undefined", this resulted in:
+ // "runtime error: left shift of negative value -1"
+ QTest::newRow("oss-fuzz 23968") << "#ÿÿÿÿÿÿÿÿÿ" << QColor();
}
void tst_QColor::namehex()
--
2.25.1
