对于一门课程，我正在用C语言做一个时间表式的练习。
好吧，你想学C。酷...
但是要知道，学习C语言只是完成了一半。您还需要学习如何使用调试器。如何启动调试会话。如何设置断点。如何一步到位如何检查变量值。等等...
现在似乎是做这件事的好时机。
同时，C还带有一个非常强大的内置调试器。它被称为printf（note 1）。
在执行malloc时添加小的调试打印输出将帮助您了解发生了什么。
例如：

printf("rows=%d cols=%d\n", rows, cols);

  size_t total_alloc = 0;
  size_t current_alloc = 0;

  // Times* ret = malloc(sizeof(Times));
  current_alloc = sizeof(Times);
  total_alloc += current_alloc;
  printf("Allocating %zu bytes for Times (total = %zu)\n", current_alloc, total_alloc);
  Times* ret = malloc(current_alloc);

  // uint** kert = malloc(sizeof(uint*)*rows);
  current_alloc = sizeof(uint*)*rows;
  total_alloc += current_alloc;
  printf("Allocating %zu bytes for row-pointers (total = %zu)\n", current_alloc, total_alloc);
  uint** kert = malloc(current_alloc);

  // and likewise for all your malloc

在这样做之后，我可以运行你的程序并得到：

rows=8 cols=9
Allocating 24 bytes for Times (total = 24)
Allocating 64 bytes for row-pointers (total = 88)
Allocating 40 bytes for cols data in row 0 (total = 128)
Allocating 40 bytes for cols data in row 1 (total = 168)
Allocating 40 bytes for cols data in row 2 (total = 208)
Allocating 40 bytes for cols data in row 3 (total = 248)
Allocating 40 bytes for cols data in row 4 (total = 288)
Allocating 40 bytes for cols data in row 5 (total = 328)
Allocating 40 bytes for cols data in row 6 (total = 368)
Allocating 40 bytes for cols data in row 7 (total = 408)

(See* 注2*）
在查看此输出时，很容易发现列中有一些奇怪的地方。9列怎么会需要40个字节？这是每列4.44字节！没道理啊现在来看看malloc列：

kert[i] = malloc(sizeof(uint)*(cols+1));
                                     ^^
                                oh, why did I add one here ???
                                I don't need 10 columns - only 9

在修复代码之后（即删除+ 1两个地方）程序现在将产生：

rows=8 cols=9
Allocating 24 bytes for Times (total = 24)
Allocating 64 bytes for row-pointers (total = 88)
Allocating 36 bytes for cols data in row 0 (total = 124)
Allocating 36 bytes for cols data in row 1 (total = 160)
Allocating 36 bytes for cols data in row 2 (total = 196)
Allocating 36 bytes for cols data in row 3 (total = 232)
Allocating 36 bytes for cols data in row 4 (total = 268)
Allocating 36 bytes for cols data in row 5 (total = 304)
Allocating 36 bytes for cols data in row 6 (total = 340)
Allocating 36 bytes for cols data in row 7 (total = 376)

经验：一些调试打印对于发现bug非常有用。但是，学习如何使用真实的的调试器是很重要的。

• 注1：不，printf不是调试器。开个玩笑... printf不能替代真实的的调试器，但做一些小的调试打印输出实际上可以非常强大地找到小程序中的bug。
• 注2：使用您的原始代码，我得到408字节，而您得到416字节。不知道为什么不同，但可能是编译器在结构Times * 中添加了8个字节的填充
  多一点

uint rows = kt->d - kt->c + 2;
  if (kt == NULL) {  <--- Too late... you all ready did the dereference
      return;  
  }

NULL检查必须在**kt->d之前**