C中的Free（）函数在释放重新分配的数据时不会产生任何错误，但不会释放实际内容。可能是什么原因？

因此，当我分配一些空间，然后在递归函数内部重新分配此空间，然后尝试在递归函数外部释放此空间时，我遇到了一个问题。Free（）不会发生任何错误，但是如调试所示，执行free（）之后，我仍然有旧内容。因此，我得到如下错误：1. malloc：*对象0x100200868错误：已释放对象的校验和不正确-对象在释放后可能已被修改。或2.malloc：*对象0x100200000错误：未分配正在释放的指针这是什么原因？

void printTrie(FILE *file, char *initialPath){

    initPath = initialPath;
    if(root.isParent == 0) return;
    char *buffer;
    char *freeCh;
    int *intArr = root.usedIndices;
    int bufferSize = 5;
    int realBufferSize = 0;

    int i = 0;

    for(i = 0; i < 36; i++){

        if(intArr[i] == 1){
            buffer = calloc(6, sizeof(char)); //<<<--- have error here after realloc was done inside recursive function
            freeCh = buffer;
            if(i > 9){
                *freeCh = i - 10 + 'a' ;
            }else{
                *freeCh = i + '0';
            }

            freeCh++;
            realBufferSize++;
            recPrint(file, &buffer, realBufferSize, bufferSize, freeCh, &root.children[i]);
            free(buffer); // <<---- try to free content here
        }
    }
}

void recPrint(FILE *file, char **buffer, int realBufferSize, int bufferSize, char *freeCh, NodePtr* temp){

    if(temp -> isParent == 0){ //no superwords in this branch anymore
        temp -> list = getFinalList(temp -> list);
        fprintf(file, "<list> %s\n", *buffer);
        printList(temp -> list, file);
        fprintf(file, "\n<list>\n");
        return;
    }

    if(temp -> isWord){
        temp -> list = getFinalList(temp -> list);
        fprintf(file, "<list> %s\n", *buffer);
        printList(temp -> list, file);
        fprintf(file, "<list>\n");

    }


    int *intArr = temp -> usedIndices;
    int i = 0;
    for(i = 0; i < 36; i++){
        if(intArr[i] == 1){
            if(i > 9){
                *freeCh = i - 10 + 'a' ;
            }else{
                *freeCh = i + '0';
            }
            realBufferSize++;
            if (realBufferSize >= bufferSize){
                *buffer = realloc(*buffer, (bufferSize + 10) * sizeof(char)); //<<--- realloc here
                if(buffer == NULL)
                    printf ("Realloc failed: %s\n", strerror(errno));
                bufferSize += 10;
            }
            freeCh++;
            recPrint(file, buffer, realBufferSize, bufferSize, freeCh, &temp -> children[i]);

            //now we need to remove all extra characters till the next turn
            freeCh--;
            realBufferSize--;
            *freeCh = '\0';
        }
    }
}