为什么会出现内存泄漏？ （C）

Question

struct game_t {
    int playercount;
    int board_width, board_height;
    int turn_of;//player number
    int eleminatedPlayer[MAX_PLAYERS];
    int turn;
    int cellcnt[MAX_PLAYERS];

    grid_t** board;

    move_t* moves;
};

game_t* new_game(int width, int height, int playercount)
{
    int i;
    game_t* newgame;
    newgame = (game_t*)calloc(1,sizeof(game_t)); //  <line 181

    newgame->board_height = height;
    newgame->board_width = width;
    newgame->playercount = playercount;
    newgame->turn_of = 0;//Red(player 0)
    zero_fill_arr((char*)newgame->eleminatedPlayer, sizeof(int)*MAX_PLAYERS);
    zero_fill_arr((char*)newgame->cellcnt, sizeof(int)*MAX_PLAYERS);

    newgame->moves = (move_t*)calloc(MAX_MOVES, sizeof(move_t));


    newgame->board = (grid_t**)calloc(width, sizeof(grid_t**));

    for (i = 0; i < width; i++)
    {
        newgame->board[i] = (grid_t*)calloc(height, sizeof(grid_t));
    }

    return newgame;
}

每次调用calloc 时，此代码都会发生内存泄漏。
示例：

    WARNING: Visual Leak Detector detected memory leaks!
---------- Block 1 at 0x00EA5B20: 76 bytes ----------
  Leak Hash: 0xE1234C8B, Count: 1, Total 76 bytes
  Call Stack (TID 3264):
    ucrtbased.dll!calloc()
    atoms.c (181): Atoms.exe!new_game() + 0xC bytes
    atoms.c (120): Atoms.exe!main() + 0x1A bytes
    f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl (64): Atoms.exe!invoke_main() + 0x1B bytes
    f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl (253): Atoms.exe!__scrt_common_main_seh() + 0x5 bytes
    f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl (296): Atoms.exe!__scrt_common_main()
    f:\dd\vctools\crt\vcstartup\src\startup\exe_main.cpp (17): Atoms.exe!mainCRTStartup()
    KERNEL32.DLL!BaseThreadInitThunk() + 0x24 bytes
    ntdll.dll!RtlSubscribeWnfStateChangeNotification() + 0x439 bytes
    ntdll.dll!RtlSubscribeWnfStateChangeNotification() + 0x404 bytes
  Data:
    02 00 00 00    03 00 00 00    03 00 00 00    00 00 00 00     ........ ........
    00 00 00 00    00 00 00 00    00 00 00 00    00 00 00 00     ........ ........
    00 00 00 00    00 00 00 00    00 00 00 00    00 00 00 00     ........ ........
    00 00 00 00    00 00 00 00    00 00 00 00    00 00 00 00     ........ ........
    00 00 00 00    60 05 EB 00    58 6D EB 00                    ....`... Xm......

附加信息：

该函数只被调用一次。

这段代码调用函数：game_session = new_game(w,h,playerno);
game_session 被初始化为 NULL(0)。

Answer 1

所以，总结一下我学到的东西：

Visual Leak Detector,LeakSanitizer(内存泄漏检测工具)
当 main 函数返回时未释放内存时检测泄漏。
因为大多数情况下，它 IS 泄漏。 C语言不会为你做Garbage Collection。

This Q&A 清楚地显示哪些内存是自动释放的，哪些不是。

您真的不必释放内存，只要让检漏仪静音即可。 但释放内存是个好习惯 - 不准

在我看来，总是释放内存。
即使是几个字节的内存泄漏也会很快累积。