# SDL: hidapi: Avoid memcpy'ing to NULL.

**URL:** <https://discourse.libsdl.org/t/sdl-hidapi-avoid-memcpying-to-null/47171>\
**Category:** SDL Commits\
**Created:** [November 6, 2023, 6:50pm UTC](https://discourse.libsdl.org/t/sdl-hidapi-avoid-memcpying-to-null/47171 "2023-11-06T18:50:01Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![SDLPushPostBot](https://discourse.libsdl.org/user_avatar/discourse.libsdl.org/sdlpushpostbot/32/4370_2.png) [@SDLPushPostBot](https://discourse.libsdl.org/u/SDLPushPostBot)\
**Post date:** [November 6, 2023, 6:50pm UTC](https://discourse.libsdl.org/t/sdl-hidapi-avoid-memcpying-to-null/47171/1 "2023-11-06T18:50:02Z")

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> <https://github.com/libsdl-org/SDL/commit/c6d9fb1ad71462bc844c6ca41e2ac7fe7cec3883>
>
> (This fix was originally from @themightyoarfish on GitHub. Thanks!)
> 
> Fixes #8428….
> Reference PR #8431.

```diff
From c6d9fb1ad71462bc844c6ca41e2ac7fe7cec3883 Mon Sep 17 00:00:00 2001
From: "Ryan C. Gordon" <[EMAIL REDACTED]>
Date: Mon, 6 Nov 2023 13:48:07 -0500
Subject: [PATCH] hidapi: Avoid memcpy'ing to NULL.

(This fix was originally from @themightyoarfish on GitHub. Thanks!)

Fixes #8428.
Reference PR #8431.
---
 src/hidapi/mac/hid.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/hidapi/mac/hid.c b/src/hidapi/mac/hid.c
index 20c664501d5e..1eb49b5d3120 100644
--- a/src/hidapi/mac/hid.c
+++ b/src/hidapi/mac/hid.c
@@ -1230,7 +1230,9 @@ static int return_data(hid_device *dev, unsigned char *data, size_t length)
 	   return buffer (data), and delete the liked list item. */
 	struct input_report *rpt = dev->input_reports;
 	size_t len = (length < rpt->len)? length: rpt->len;
-	memcpy(data, rpt->data, len);
+	if (data != NULL) {
+ memcpy(data, rpt->data, len);
+	}
 	dev->input_reports = rpt->next;
 	free(rpt->data);
 	free(rpt);

```