在 C 中释放内存不起作用

Question

当我试图释放C.中分配的内存时，我遇到了一个问题

int i,j,**redmatrix, **bluematrix, **greenmatrix;
double **weigthMatrix,fsom;
weigthMatrix = (double**) calloc(radius*2+1,sizeof(double*));
redmatrix = (int**) calloc(radius*2+1,sizeof(int*));
bluematrix = (int**) calloc(radius*2+1,sizeof(int*));
greenmatrix = (int**) calloc(radius*2+1,sizeof(int*));
if(weigthMatrix==NULL || redmatrix==NULL || bluematrix==NULL || greenmatrix==NULL){
    printf("%sn", "Error: probleem met geheugenallocatie");
    exit(1);
}
for(i=0;i<radius*2+2;i++){
    weigthMatrix[i] = (double*) calloc(radius*2+1,sizeof(double));
    redmatrix[i] = (int*) calloc(radius*2+1,sizeof(int));
    bluematrix[i] = (int*) calloc(radius*2+1,sizeof(int));
    greenmatrix[i] = (int*) calloc(radius*2+1,sizeof(int));
    if(weigthMatrix[i]==NULL || redmatrix[i]==NULL || bluematrix[i]==NULL || greenmatrix[i]==NULL){
        printf("%sn", "Error: probleem met geheugenallocatie");
        exit(1);
    }
}
for(i=0;i<radius*2+1;i++){
    free(weigthMatrix[i]);
    free(redmatrix[i]);
    free(bluematrix[i]);
    free(greenmatrix[i]);
}
free(redmatrix);    //MY PROGRAM CRASHES HERE
free(bluematrix);
free(greenmatrix);
free(weigthMatrix);
free_image(&copyImage);

当我试图释放数组的顶级时，我的程序崩溃。我不知道我做错了什么。我想我把所有东西都分配对了吗？

Answer 1

您为radius*2+1元素保留空间

redmatrix = (int**) calloc(radius*2+1,sizeof(int*));

但是你用radius*2+2元素填充并释放数组

for(i=0;i<radius*2+2;i++){
    redmatrix[i] = (int*) calloc(radius*2+1,sizeof(int));
for(i=0;i<radius*2+2;i++){
    free(redmatrix[i]);
    ...

更改为

for(i=0;i<radius*2+1;i++){
    redmatrix[i] = (int*) calloc(radius*2+1,sizeof(int));
    ...
for(i=0;i<radius*2+1;i++){
    free(redmatrix[i]);
    ...

请不要投射malloc