Vector structure issues

[_person_]

EDIT: Ack! Oops, I meant to post this in the other C++ forum! Could someone please move this?

So I'm messing around with SDL in C++ a bit. I've written a function to add a surface to a vector of a structure. Like so:

struct renderlist_entry
{
    SDL_Surface *surface;
    float x;
    float y;
    float w;
    float h;
};

vector<renderlist_entry*> renderlist;

... blah blah ...


int add_to_render_list(const char* filename, float x, float y, float w, float h)
{
    /* First we should ensure that the file can be loaded. */
    SDL_Surface *tmp_surface;
    renderlist_entry *entry;

    // Load the file first.
    tmp_surface = IMG_Load(filename);
    if (tmp_surface == NULL)
    {
        cerr << "Bad image was attempted to load: " << filename << "\nAbort load.\n";
        return 0;
    }
    cout << "test\n";
    entry->surface = tmp_surface;
    entry->x = x;
    entry->y = y;
    entry->w = w;
    entry->h = h;
    cout << "and again.\n";
    renderlist.push_back(entry); // Add the surface to the texturelist vector.
    return 1;
}

After the "cout << "test"", the app crashes (it compiled fine, by the way). The cerr is never called (so the surface loads fine). What might be wrong with the code between the two cout's?

It ran perfectly when it used a vector of SDL_Surfaces instead of a vector of renderlist_entry structures.