From 3cbe9227656494166d042456df3bc7d86c4cc54f Mon Sep 17 00:00:00 2001
From: Garux <garux@mail.ru>
Date: Fri, 1 Jan 2021 17:42:08 +0300
Subject: [PATCH] fix UB: fwrite with buffer = NULL

---
 tools/quake3/common/cmdlib.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/quake3/common/cmdlib.c b/tools/quake3/common/cmdlib.c
index a2045070..7a7c8da2 100644
--- a/tools/quake3/common/cmdlib.c
+++ b/tools/quake3/common/cmdlib.c
@@ -438,7 +438,7 @@ void SafeRead( FILE *f, void *buffer, int count ){
 
 
 void SafeWrite( FILE *f, const void *buffer, int count ){
-	if ( fwrite( buffer, 1, count, f ) != (size_t)count ) {
+	if ( buffer != NULL && fwrite( buffer, 1, count, f ) != (size_t)count ) {
 		Error( "File write failure" );
 	}
 }