mirror of
https://github.com/Ponce/slackbuilds
synced 2024-12-02 13:04:42 +01:00
63 lines
1.9 KiB
Diff
63 lines
1.9 KiB
Diff
From bb4dc77eecb6ed1b967e3ecbce3dac6c5e6f1527 Mon Sep 17 00:00:00 2001
|
|
From: Benjamin Wolsey <bwy@benjaminwolsey.de>
|
|
Date: Sat, 10 Mar 2012 14:52:50 +0000
|
|
Subject: Fix crash in GnashImage.cpp
|
|
|
|
---
|
|
diff --git a/libbase/GnashImage.cpp b/libbase/GnashImage.cpp
|
|
index 11c6956..03a6939 100644
|
|
--- a/libbase/GnashImage.cpp
|
|
+++ b/libbase/GnashImage.cpp
|
|
@@ -26,6 +26,7 @@
|
|
#include <boost/scoped_array.hpp>
|
|
#include <boost/shared_ptr.hpp>
|
|
#include <algorithm>
|
|
+#include <cassert>
|
|
|
|
#ifdef USE_PNG
|
|
# include "GnashImagePng.h"
|
|
@@ -44,6 +45,21 @@ namespace image {
|
|
|
|
namespace {
|
|
void processAlpha(GnashImage::iterator imageData, size_t pixels);
|
|
+ bool checkValidSize(size_t width, size_t height, size_t channels) {
|
|
+
|
|
+ if (width == 0 || height == 0) return false;
|
|
+
|
|
+ assert(channels > 0);
|
|
+
|
|
+ boost::uint32_t maxSize = std::numeric_limits<boost::int32_t>::max();
|
|
+ if (width >= maxSize || height >= maxSize) return false;
|
|
+
|
|
+ maxSize /= channels;
|
|
+ maxSize /= width;
|
|
+ maxSize /= height;
|
|
+
|
|
+ return maxSize > 0;
|
|
+ }
|
|
}
|
|
|
|
GnashImage::GnashImage(iterator data, size_t width, size_t height,
|
|
@@ -55,6 +71,8 @@ GnashImage::GnashImage(iterator data, size_t width, size_t height,
|
|
_height(height),
|
|
_data(data)
|
|
{
|
|
+ // Callers should check dimensions
|
|
+ assert(checkValidSize(_width, _height, channels()));
|
|
}
|
|
|
|
/// Create an image allocating a buffer of height*pitch bytes
|
|
@@ -66,8 +84,9 @@ GnashImage::GnashImage(size_t width, size_t height, ImageType type,
|
|
_width(width),
|
|
_height(height)
|
|
{
|
|
- const size_t max = std::numeric_limits<boost::int32_t>::max();
|
|
- if (size() > max) {
|
|
+ // Constructed from external input, so restrict dimensions to avoid
|
|
+ // overflow in size calculations
|
|
+ if (!checkValidSize(_width, _height, channels())) {
|
|
throw std::bad_alloc();
|
|
}
|
|
_data.reset(new value_type[size()]);
|
|
--
|
|
cgit v0.9.0.2
|