From 8f4ddcef033333a41f3a0c8b043dc056829b0cfb Mon Sep 17 00:00:00 2001
From: Andynium <ender3info@gmail.com>
Date: Sun, 1 Mar 2026 10:06:26 +0100
Subject: [PATCH] utils: make fallback realpath safe

---
 utils/utils.c | 21 ++++++++++++++-------
 1 file changed, 14 insertions(+), 7 deletions(-)

diff --git a/utils/utils.c b/utils/utils.c
index c64718531..2ad921eee 100644
--- a/utils/utils.c
+++ b/utils/utils.c
@@ -27,6 +27,7 @@
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <unistd.h>
+#include <errno.h>
 
 #include "utils/messages.h"
 #include "utils/dirent.h"
@@ -472,14 +473,20 @@ int uname(struct utsname *buf) {
 
 char *realpath(const char *path, char *resolved_path)
 {
-	char *ret;
-	if (resolved_path == NULL) {
-		ret=strdup(path);
-	} else {
-		ret = resolved_path;
-		strcpy(resolved_path, path);
+	if (path == NULL) {
+		errno = EINVAL;
+		return NULL;
 	}
-	return ret;
+
+	/* Without a system realpath(), we cannot safely copy into an unknown-sized
+	 * caller buffer. Provide only the allocating form.
+	 */
+	if (resolved_path != NULL) {
+		errno = ENAMETOOLONG;
+		return NULL;
+	}
+
+	return strdup(path);
 }
 
 #endif