CopyCompatToKeymap(struct xkb_keymap *keymap, CompatInfo *info)
{
    keymap->compat_section_name = strdup_safe(info->name);
    XkbEscapeMapName(keymap->compat_section_name);

    keymap->mods = info->mods;

    if (!darray_empty(info->interps)) {
        struct collect collect;
        darray_init(collect.sym_interprets);

        /* Most specific to least specific. */
        CopyInterps(info, true, MATCH_EXACTLY, &collect);
        CopyInterps(info, true, MATCH_ALL, &collect);
        CopyInterps(info, true, MATCH_NONE, &collect);
        CopyInterps(info, true, MATCH_ANY, &collect);
        CopyInterps(info, true, MATCH_ANY_OR_NONE, &collect);
        CopyInterps(info, false, MATCH_EXACTLY, &collect);
        CopyInterps(info, false, MATCH_ALL, &collect);
        CopyInterps(info, false, MATCH_NONE, &collect);
        CopyInterps(info, false, MATCH_ANY, &collect);
        CopyInterps(info, false, MATCH_ANY_OR_NONE, &collect);

        darray_steal(collect.sym_interprets,
                     &keymap->sym_interprets, &keymap->num_sym_interprets);
    }

    CopyLedMapDefsToKeymap(keymap, info);

    return true;
}

The product dereferences a pointer that it expects to be valid but is NULL.