在另一个函数中传递一个三重指针来分配内存，sscanf异常

我在另一个函数中分配内存给双指针，因此我需要使用指针指向指针的指针。当我使用sscanf时，我得到一个异常抛出，我不确定确切的原因。下面是代码片段。这是工作的早期，当它都在同一个函数，我只需要使用双指针，但现在，我重构代码和使用三重指针，我有这个问题。

typedef float vector[3]
int mainLoaderFunc() {
    char* memory = NULL;
    size_t size = loadFile(fileName, &memory); // load model file into memory, this works, tested and true
    // create vector arrays
    vector *vertexArray = NULL;         
    vector *normalArray = NULL;         
    vector *textureArray = NULL;        
    loadArrays(size, memory, &vertexArray, &normalArray, &textureArray);
    // do other stuff with arrays
}
void loadArrays(size_t size, char *memory, vector **vertexArray, vector **normalArray, vector **textureArray) {
    int numVerts = 0; 
    int numNormals = 0;  
    int numTextures = 0;  
    char* p = memory;           // pointer to start of memory
    char* e = memory + size;    // pointer to end of memory
    // count verts, normals, textures for memory allocation
    while (p != e) {
        if (memcmp(p, "vn", 2) == 0) {
            numNormals++;
        } else if (memcmp(p, "vt", 2) == 0) { 
            numTextures++;
        } else if (memcmp(p, "v",  1) == 0) {
            numVerts++;
        } 
        while (*p++ != (char) 0x0A);
    }
    // allocate memory for vector arrays
    *vertexArray        = new vector[numVerts];
    *normalArray        = new vector[numNormals];
    *textureArray       = new vector[numTextures];
    p = memory;
    int vertexIndex = 0;
    int normalIndex = 0;
    int textureIndex = 0;  //*** IF BREAK POINT HERE: NO EXCEPTION
    // load data from memory into arrays
    while (p != e) {
        if (memcmp(p, "vn", 2) == 0) {
            sscanf(p, "vn %f %f %f", &normalArray[normalIndex][0], &normalArray[normalIndex][1], &normalArray[normalIndex][2]);
            normalIndex++;
        } else if (memcmp(p, "vt", 2) == 0) {
            sscanf(p, "vt %f %f", &textureArray[textureIndex][0], &textureArray[textureIndex][1]);
            textureIndex++;
        } else if (memcmp(p, "v", 1) == 0) {
            sscanf(p, "v %f %f %f", &vertexArray[vertexIndex][0], &vertexArray[vertexIndex][1], &vertexArray[vertexIndex][2]);
            vertexIndex++;
        } 
        while (*p++ != (char) 0x0A);
    }
}

一旦代码到达sscanf部分，我得到异常:

Unhandled exception at 0x5e9cf2dc (msvcr100d.dll) in derp.exe: 0xC0000005: Access violation writing location 0xcccccccc.