[Bugfix] fix logit processor excceed vocab size issue (#6927)

vllm/entrypoints/openai/logits_processors.py

@@ -58,6 +58,12 @@ def get_logits_processors(
                 "Found token_id in logit_bias that is not "
                 "an integer or string representing an integer") from exc
 
+        # Check if token_id is within the vocab size
+        for token_id, bias in clamped_logit_bias.items():
+            if token_id < 0 or token_id >= tokenizer.vocab_size:
+                raise ValueError("token_id in logit_bias contains "
+                                 "out-of-vocab token id")
+
         def logit_bias_logits_processor(token_ids: List[int],
                                         logits: torch.Tensor) -> torch.Tensor:
             for token_id, bias in clamped_logit_bias.items():