Exception thrown at 0x00007FFECFCBB16B (ucrtbase.dll) in Project-512.exe: 0xC0000005: Access violation writing location 0xFFFFFFFFF9CF4880

I’m trying to read a file in C, but after writing a bunch of code in order to allocate memory I’m having problems actually reading the file in that I’m getting a memory access violation, I tried allocating more memory than I actually need for the char pointer but ultimately I’m still getting the memory allocation error, the code is currently

static char* readShader(char path[]) {
    char cwd[1024];
    if (getcwd(cwd, sizeof(cwd)) != NULL) {
        printf("Current working dir: %s\n", cwd);
    }
    else {
        perror("getcwd() error");
    }
    int lines = 0;
    char full_path[512];
    snprintf(full_path, sizeof(full_path), "%s/%s", cwd, path);
    FILE* fpointer = fopen(full_path, "r");
    if (fpointer == NULL)
    {
        printf("ERROR: COULD NOT LOAD SHADER");
        return NULL;
    }
    int ch;
    lines++;
    while ((ch = fgetc(fpointer)) != EOF) {
        if (ch == '\n') {
            lines++;
            printf("reading line: %d \n", lines);
        }
    }
    printf("there are %d ", lines);
    printf("lines in the file %s\n", path);

    rewind(fpointer);


    fseek(fpointer, 0, SEEK_END);  // Move to the end of the file
    int fileSize = ftell(fpointer);  // Get the size of the file
    rewind(fpointer);
    printf("filesize: %d\n", fileSize);
    char* shaderCode = malloc(fileSize);
    if (shaderCode == NULL) {
        printf("Memory allocation failed\n");
        fclose(fpointer);
        return NULL;
    }
    char* str = malloc(fileSize + 1);
    if (str == NULL)
    {
        printf("Memory allocation failed\n");
        fclose(fpointer);
        return NULL;
    }

    while (fgets(str, fileSize, fpointer) != NULL) // fgets() will return NULL on EOF
    {
        printf("%s", str);
    }
    printf("%s", str);

    printf("\n");

    fclose(fpointer);

    printf("Shader loaded successfully. File size: %ld bytes\n", fileSize);
    return shaderCode;
}

with the error happening at

while (fgets(str, fileSize, fpointer) != NULL)

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