From 0f871c033c9f990250b62bd9c5d71441c1266c97 Mon Sep 17 00:00:00 2001
From: Sylvain Becker <sylvain.becker@gmail.com>
Date: Wed, 23 Oct 2019 09:53:23 +0200
Subject: [PATCH] Fixed bug 4843 - Passing NULL to memset in
 SDL_PrivateLoadButtonMapping (Thanks!)

---
 src/joystick/SDL_gamecontroller.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/joystick/SDL_gamecontroller.c b/src/joystick/SDL_gamecontroller.c
index 488ccb570..a974bd48e 100644
--- a/src/joystick/SDL_gamecontroller.c
+++ b/src/joystick/SDL_gamecontroller.c
@@ -691,7 +691,9 @@ static void SDL_PrivateLoadButtonMapping(SDL_GameController *gamecontroller, con
 
     gamecontroller->name = pchName;
     gamecontroller->num_bindings = 0;
-    SDL_memset(gamecontroller->last_match_axis, 0, gamecontroller->joystick->naxes * sizeof(*gamecontroller->last_match_axis));
+    if (gamecontroller->joystick->naxes) {
+        SDL_memset(gamecontroller->last_match_axis, 0, gamecontroller->joystick->naxes * sizeof(*gamecontroller->last_match_axis));
+    }
 
     SDL_PrivateGameControllerParseControllerConfigString(gamecontroller, pchMapping);