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wasi_nn_llamacpp.c: fix buffer overruns in set_input #4420

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Merged
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Jun 27, 2025
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wasi_nn_llamacpp.c: fix buffer overruns in set_input #4420

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6 changes: 3 additions & 3 deletions core/iwasm/libraries/wasi-nn/src/wasi_nn_llamacpp.c
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Original file line number Diff line number Diff line change
Expand Up @@ -384,18 +384,18 @@ set_input(void *ctx, graph_execution_context exec_ctx, uint32_t index,
tensor *wasi_nn_tensor)
{
struct LlamaContext *backend_ctx = (struct LlamaContext *)ctx;
// tensor->data is the prompt string. ends with \0
// tensor->data is the prompt string.
char *prompt_text = (char *)wasi_nn_tensor->data.buf;
uint32_t prompt_text_len = wasi_nn_tensor->data.size;

#ifndef NDEBUG
NN_DBG_PRINTF("--------------------------------------------------");
NN_DBG_PRINTF("prompt_text: %s", prompt_text);
NN_DBG_PRINTF("prompt_text: %.*s", (int)prompt_text_len, prompt_text);
NN_DBG_PRINTF("--------------------------------------------------");
#endif

// tokenize the prompt
uint32_t n_token_max = llama_n_ctx(backend_ctx->ctx);
uint32_t prompt_text_len = strlen(prompt_text);

if (backend_ctx->prompt == NULL) {
backend_ctx->prompt = calloc(n_token_max, sizeof(llama_token));
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