From afa00abb2b68205bee539d7947130d6b1b1ec6e9 Mon Sep 17 00:00:00 2001
From: Marvin Borner
Date: Thu, 1 Apr 2021 19:39:14 +0200
Subject: Hardened entire system

By using the nonnull attribute and replace buffer-overflow-prone
functions like strcpy, strcat and sprintf by strlcpy, strlcat and
snprintf.
---
 libs/libgui/png.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'libs/libgui/png.c')

diff --git a/libs/libgui/png.c b/libs/libgui/png.c
index 6f8f4b5..2ff3340 100644
--- a/libs/libgui/png.c
+++ b/libs/libgui/png.c
@@ -90,7 +90,8 @@ static void *png_realloc(void *ptr, u32 new_size)
 
 static void png_free(void *ptr)
 {
-	free(ptr);
+	if (ptr)
+		free(ptr);
 }
 #else /*PNG_COMPILE_ALLOCATORS*/
 /* TODO: support giving additional void* payload to the custom allocators */
-- 
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