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Tue, 29 January 2013 18:10

zsolt
Messages: 702
Registered: December 2005
Location: Budapest, Hungary

Contributor

One of my beta tester sent me some crash files:

Typical start of them is:

Access violation reading at 0x00000002
0x005be950: class Upp::Image Upp::DownScale(class Upp::Image const &,int,int) + 0x150 bytes

Recognized stack dwords:
	0x005c03cd: ??$Sort@PAUCell@Rasterizer@Upp@@U?$StdLess@UCell@Rasterizer@Upp@@@3@@Upp@@YAXPAUCell@Rasterizer@0@0ABU?$StdLess@UCell@Rasterizer@Upp@@@0@@Z + 0x29d bytes
	0x006f95d1: __ehhandler$?DownScale@Upp@@YA?AVImage@1@ABV21@HH@Z + 0x0 bytes
	0x005beb80: void Upp::PainterImageSpan::Set(struct Upp::Xform2D const &,class Upp::Image const &) + 0xf0 bytes
	0x007021e8: __ehhandler$?WorkPage@Heap@Upp@@QAEPAUPage@12@H@Z + 0x0 bytes
	0x006f95eb: __ehhandler$?Set@PainterImageSpan@Upp@@QAEXABUXform2D@2@ABVImage@2@@Z + 0x0 bytes
	0x005bb7ee: class Upp::Vector<struct Upp::RGBA> & Upp::operator<<=(class Upp::Vector<struct Upp::RGBA> &,class Upp::Vector<struct Upp::RGBA> const &) + 0x30 bytes
	0x006f63de: __ehhandler$??$DeepCopyConstruct@UPos@HelpWindow@Upp@@@Upp@@YAAAUPos@HelpWindow@0@PAXABU120@@Z + 0x0 bytes
	0x005bb250: struct Upp::Xform2D Upp::operator*(struct Upp::Xform2D const &,struct Upp::Xform2D const &) + 0x9 bytes
	0x005bf2e1: void Upp::BufferPainter::RenderImage(double,class Upp::Image const &,struct Upp::Xform2D const &,unsigned long) + 0xf1 bytes

I was able to reproduce it, bit it is not easy.
It crashes in this code:

				while(s < e) {
					for(int n = nx; n--;)
						t->Put(*s++);
					t++;
				}

The problem is that in this line:

t->Put(*s++);

s variable points to a not accessible memory address.

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