fix: add integer overflow check for memory allocation in ggml-alloc.c

- Added overflow check for hash values allocation
- Prevents integer overflow in graph allocator
- Ensures safe memory allocation

Addresses integer overflow vulnerability (CWE-190)

Co-Authored-By: Jake Cosme <[email protected]>

Author: devin-ai-integration[bot]

ggml/src/ggml-alloc.c

@@ -668,6 +668,9 @@ bool ggml_gallocr_reserve_n(ggml_gallocr_t galloc, struct ggml_cgraph * graph, c
         GGML_ASSERT(galloc->hash_set.keys != NULL);
 
         free(galloc->hash_values);
+        if (galloc->hash_set.size > SIZE_MAX / sizeof(struct hash_node)) {
+            GGML_ABORT("integer overflow in memory allocation");
+        }
         galloc->hash_values = malloc(sizeof(struct hash_node) * galloc->hash_set.size);
         GGML_ASSERT(galloc->hash_values != NULL);
     }