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From 3e55cd6dc467303a3c35312e9fcb255c2c048b32 Mon Sep 17 00:00:00 2001
From: Eirik Aavitsland <eirik.aavitsland@theqtcompany.com>
Date: Wed, 11 Mar 2015 13:34:01 +0100
Subject: Fixes crash in bmp and ico image decoding
Fuzzing test revealed that for certain malformed bmp and ico files,
the handler would segfault.
Change-Id: I19d45145f31e7f808f7f6a1a1610270ea4159cbe
(cherry picked from qtbase/2adbbae5432aa9d8cc41c6fcf55c2e310d2d4078)
Reviewed-by: Richard J. Moore <rich@kde.org>
---
src/gui/image/qbmphandler.cpp | 13 +++++++------
src/plugins/imageformats/ico/qicohandler.cpp | 2 +-
2 files changed, 8 insertions(+), 7 deletions(-)
diff --git a/src/gui/image/qbmphandler.cpp b/src/gui/image/qbmphandler.cpp
index 30fa9e0..17a880b 100644
--- a/src/gui/image/qbmphandler.cpp
+++ b/src/gui/image/qbmphandler.cpp
@@ -478,12 +478,6 @@ static bool read_dib_body(QDataStream &s, const BMP_INFOHDR &bi, int offset, int
p = data + (h-y-1)*bpl;
break;
case 2: // delta (jump)
- // Protection
- if ((uint)x >= (uint)w)
- x = w-1;
- if ((uint)y >= (uint)h)
- y = h-1;
-
{
quint8 tmp;
d->getChar((char *)&tmp);
@@ -491,6 +485,13 @@ static bool read_dib_body(QDataStream &s, const BMP_INFOHDR &bi, int offset, int
d->getChar((char *)&tmp);
y += tmp;
}
+
+ // Protection
+ if ((uint)x >= (uint)w)
+ x = w-1;
+ if ((uint)y >= (uint)h)
+ y = h-1;
+
p = data + (h-y-1)*bpl + x;
break;
default: // absolute mode
diff --git a/src/plugins/imageformats/ico/qicohandler.cpp b/src/plugins/imageformats/ico/qicohandler.cpp
index 1a88605..3c34765 100644
--- a/src/plugins/imageformats/ico/qicohandler.cpp
+++ b/src/plugins/imageformats/ico/qicohandler.cpp
@@ -571,7 +571,7 @@ QImage ICOReader::iconAt(int index)
QImage::Format format = QImage::Format_ARGB32;
if (icoAttrib.nbits == 24)
format = QImage::Format_RGB32;
- else if (icoAttrib.ncolors == 2)
+ else if (icoAttrib.ncolors == 2 && icoAttrib.depth == 1)
format = QImage::Format_Mono;
else if (icoAttrib.ncolors > 0)
format = QImage::Format_Indexed8;
--
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