From eeef4e4752843b4b9a982aaffaa3fc28431705ab Mon Sep 17 00:00:00 2001
From: Sander Speetjens <sander.speetjens@gmail.com>
Date: Wed, 7 Aug 2024 23:17:06 +0200
Subject: [PATCH] safe array

add extra safety checks to array_realloc
---
 src/safe_array.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/src/safe_array.c b/src/safe_array.c
index 720b97c..e33189d 100644
--- a/src/safe_array.c
+++ b/src/safe_array.c
@@ -49,7 +49,16 @@ array_t *array_realloc(array_t* arr, size_t rows)
         fprintf(stderr, "%s: ptr dereferences to NULL\n", __func__);
         return NULL;
     }
-
+    if (arr->rows > rows)
+    {
+        fprintf(stderr, "%s: arr->rows (%d) > rows (%d)\n", __func__, arr->rows, rows);
+        return NULL;
+    }
+    if (arr->rows == rows)
+    {
+        return arr;
+    }
+    
     array_t *new_arr = realloc(arr, sizeof(array_t) + (arr->size * rows - 1));
     if (!new_arr)
     {