On 17/06/11 16:45, Stephanie Stroka wrote:
> I actually ignored three warnings. It's still a bit cryptic for me. For
> example, I get the following msg:
>
> Invalid write of size 4
> ==4427== at 0x405930: sort(unsigned int**, unsigned int, unsigned
> int) (facedetect.cpp:293)
> ==4427== by 0x407EA9: findScrambledArea(cv::Mat&) (facedetect.cpp:536)
> ==4427== by 0x40AFFD: runOperation(Mode, CryptoKey const&,
> DetectorParams&, std::string, std::string, std::string, bool)
> (facedetect.cpp:625)
> ==4427== by 0x40BCD8: main (facedetect.cpp:700)
> ==4427== Address 0x11154010 is 0 bytes after a block of size 2,080 alloc'd
> ==4427== at 0x4C2668A: malloc (vg_replace_malloc.c:236)
> ==4427== by 0x4058CE: sort(unsigned int**, unsigned int, unsigned
> int) (facedetect.cpp:287)
> ==4427== by 0x407EA9: findScrambledArea(cv::Mat&) (facedetect.cpp:536)
> ==4427== by 0x40AFFD: runOperation(Mode, CryptoKey const&,
> DetectorParams&, std::string, std::string, std::string, bool)
> (facedetect.cpp:625)
> ==4427== by 0x40BCD8: main (facedetect.cpp:700)
>
>
> My code at that position looks like this:
>
> 284 static uint* sort(uint** matrix, uint width, uint height) {
> 285 uint* data = (uint*) malloc(width * height * sizeof(uint));
> 286 uint i,j=0;
> 287 for(i=0; i<height; i++) {
> 288 for(j=0; j<width; j++) {
> 289 data[j + i*height] = matrix[i][j];
> 290 }
> 291 }
> ...
>
> I don't see why I'm using an invalid write of size 4. I'm retrieving an
> uint and I'm writing an uint.
The write it is complaining about is at line 293 and you haven't shown
us that line ;-)
What it is saying is that you are writing beyond the end of the array.
Tom
--
Tom Hughes (t...@compton.nu)
http://compton.nu/
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