--- a/vendor/hiredis/alloc.c
+++ b/vendor/hiredis/alloc.c
@@ -68,6 +68,10 @@ void *hi_malloc(size_t size) {
 }
 
 void *hi_calloc(size_t nmemb, size_t size) {
+    /* Overflow check as the user can specify any arbitrary allocator */
+    if (SIZE_MAX / size < nmemb)
+        return NULL;
+
     return hiredisAllocFns.callocFn(nmemb, size);
 }
 
diff --git a/alloc.h b/alloc.h
index 34a05f4..771f9fe 100644
--- a/vendor/hiredis/alloc.h
+++ b/vendor/hiredis/alloc.h
@@ -32,6 +32,7 @@
 #define HIREDIS_ALLOC_H
 
 #include <stddef.h> /* for size_t */
+#include <stdint.h>
 
 #ifdef __cplusplus
 extern "C" {
@@ -59,6 +60,10 @@ static inline void *hi_malloc(size_t size) {
 }
 
 static inline void *hi_calloc(size_t nmemb, size_t size) {
+    /* Overflow check as the user can specify any arbitrary allocator */
+    if (SIZE_MAX / size < nmemb)
+        return NULL;
+
     return hiredisAllocFns.callocFn(nmemb, size);
 }