From 2345bc44bb34f3eb6b49f4db3f0369573b892c3d Mon Sep 17 00:00:00 2001
From: Samuel Thibault <samuel.thibault@ens-lyon.org>
Date: Thu, 3 Aug 2023 21:15:58 +0200
Subject: [PATCH] Subject: hurd: Make __realpath return EINVAL on NULL buf

As Posix and stdlib/test-canon.c expects it, and rather than letting
pathconf crash.
---
 debug/realpath_chk.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/debug/realpath_chk.c b/debug/realpath_chk.c
index adfc09237c..8e734b534e 100644
--- a/debug/realpath_chk.c
+++ b/debug/realpath_chk.c
@@ -19,6 +19,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
+#include <errno.h>
 
 
 char *
@@ -30,7 +31,15 @@ __realpath_chk (const char *buf, char *resolved, size_t resolvedlen)
 
   return __realpath (buf, resolved);
 #else
-  long int pathmax =__pathconf (buf, _PC_PATH_MAX);
+  long int pathmax;
+
+  if (buf == NULL)
+    {
+      __set_errno (EINVAL);
+      return NULL;
+    }
+
+  pathmax = __pathconf (buf, _PC_PATH_MAX);
   if (pathmax != -1)
     {
       /* We do have a fixed limit.  */