From ea33e9647bec2d549b6a1a60fa9f4caf315aca92 Mon Sep 17 00:00:00 2001
From: Gunnar Beutner <gbeutner@serenityos.org>
Date: Sat, 29 May 2021 14:46:10 +0200
Subject: [PATCH] LibC: Don't leak memory for realloc(p, 0)

Previously we'd leak memory when the user called realloc(p, 0). Instead
this call should behave as if the user had called free(p).
---
 Userland/Libraries/LibC/malloc.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Userland/Libraries/LibC/malloc.cpp b/Userland/Libraries/LibC/malloc.cpp
index 7e57612db5..3331537293 100644
--- a/Userland/Libraries/LibC/malloc.cpp
+++ b/Userland/Libraries/LibC/malloc.cpp
@@ -437,8 +437,10 @@ void* realloc(void* ptr, size_t size)
 {
     if (!ptr)
         return malloc(size);
-    if (!size)
+    if (!size) {
+        free(ptr);
         return nullptr;
+    }
 
     Threading::Locker locker(malloc_lock());
     auto existing_allocation_size = malloc_size(ptr);