From 1eabf13577bfb2c440eb93851173fe01ed9d0ba9 Mon Sep 17 00:00:00 2001
From: modric <pioneerbtw7@163.com>
Date: Sat, 19 Nov 2022 11:22:14 +0800
Subject: [PATCH] sudo_mmap_strdup_v1: Fix potential NULL pointer deref

---
 lib/util/mmap_alloc.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/lib/util/mmap_alloc.c b/lib/util/mmap_alloc.c
index df3d4cbcc2..cd678a07c5 100644
--- a/lib/util/mmap_alloc.c
+++ b/lib/util/mmap_alloc.c
@@ -116,8 +116,10 @@ sudo_mmap_strdup_v1(const char *str)
 	return NULL;
     }
     newstr = sudo_mmap_alloc_v1(len + 1);
-    memcpy(newstr, str, len);
-    newstr[len] = '\0';
+    if (newstr != NULL) {
+        memcpy(newstr, str, len);
+        newstr[len] = '\0';
+    }
 
     return newstr;
 }