vocab : assert array size of scores and toktypes (#20737)

src/llama-vocab.cpp

@@ -2129,19 +2129,28 @@ void llama_vocab::impl::load(llama_model_loader & ml, const LLM_KV & kv) {
         throw std::runtime_error("cannot find tokenizer vocab in model file\n");
     }
 
+    const uint32_t n_tokens = gguf_get_arr_n(ctx, token_idx);
+
     const float * scores = nullptr;
     const int score_idx = gguf_find_key(ctx, kv(LLM_KV_TOKENIZER_SCORES).c_str());
     if (score_idx != -1) {
+        const uint32_t n_scores = gguf_get_arr_n(ctx, score_idx);
+        if (n_scores < n_tokens) {
+            throw std::runtime_error("Index out of array bounds for scores (" + std::to_string(n_scores) + " < " + std::to_string(n_tokens) + ")\n");
+        }
         scores = (const float * ) gguf_get_arr_data(ctx, score_idx);
     }
 
     const int * toktypes = nullptr;
     const int toktype_idx = gguf_find_key(ctx, kv(LLM_KV_TOKENIZER_TOKEN_TYPE).c_str());
     if (toktype_idx != -1) {
+        const uint32_t n_toktypes = gguf_get_arr_n(ctx, toktype_idx);
+        if (n_toktypes < n_tokens) {
+            throw std::runtime_error("Index out of array bounds for toktypes (" + std::to_string(n_toktypes) + " < " + std::to_string(n_tokens) + ")\n");
+        }
         toktypes = (const int * ) gguf_get_arr_data(ctx, toktype_idx);
     }
 
-    uint32_t n_tokens = gguf_get_arr_n(ctx, token_idx);
     id_to_token.resize(n_tokens);
 
     for (uint32_t i = 0; i < n_tokens; i++) {