OpenCL Image reading not working on dynamically allocated array -

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i'm writing opencl program applies convolution matrix on image. works fine if store pixel on array image[height*width][4] (line 65,commented) (sorry, speak spanish, , code in spanish). but, since images i'm working large, need allocate memory dynamically. execute code, , segmentation fault error.

after poor man's debugging, found out problem arises after executing kernel , reading output image host, storing data dynamically allocated array. can't access data of array without getting error.

i think problem way clenqueuereadimage function (line 316) writes image data image array. array allocated dynamically, has no predefined "structure".

but need solution, , can't find it, nor on own or on internet.

the c program , opencl kernel here: https://gist.github.com/migagh/6dd0fddfa09f5aabe7eb0c2934e58cbe

don't use pointers pointers (unsigned char**). use regular pointer instead:

unsigned char* image = (unsigned char*)malloc(sizeof(unsigned char)*ancho*alto*4);

then in loop:

for(i=0; i<ancho*alto; i++){     unsigned char* pixel = (unsigned char*)malloc(sizeof(unsigned char)*4);     fread (pixel, 4, 1, bmp_entrada);     image[i*4] = pixel[0];     image[i*4+1] = pixel[1];     image[i*4+2] = pixel[2];     image[i*4+3] = pixel[3];     free(pixel); }

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