From 4440f15453d752d753ef335c09a24d0715275efd Mon Sep 17 00:00:00 2001
From: Peter Hutterer <peter.hutterer@who-t.net>
Date: Fri, 17 Apr 2026 18:50:23 +1000
Subject: [PATCH] util: return NULL in memmap_new() for a size 0

Assisted-by: Claude:claude-opus-4-6
Part-of: <https://gitlab.freedesktop.org/libinput/libei/-/merge_requests/388>
---
 src/util-memmap.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/util-memmap.c b/src/util-memmap.c
index a106ef2..31445f7 100644
--- a/src/util-memmap.c
+++ b/src/util-memmap.c
@@ -55,6 +55,9 @@ OBJECT_IMPLEMENT_GETTER(memmap, data, void *);
 struct memmap *
 memmap_new(int fd, size_t sz)
 {
+	if (sz == 0)
+		return NULL;
+
 	_unref_(memmap) *memmap = memmap_create(NULL);
 
 	void *map = mmap(NULL, sz, PROT_READ, MAP_PRIVATE, fd, 0);