From 158bc33fb3d9df36a8f0e969bb9040252b66c6b7 Mon Sep 17 00:00:00 2001
From: "Andrew A. Vasilyev" <andy@altlinux.org>
Date: Fri, 25 Sep 2020 23:11:32 +0300
Subject: [PATCH] fix possible race between checking and creating a directory

---
 libxslt/security.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git libxslt/security.c libxslt/security.c
index 550dc4e2..927d55b3 100644
--- libxslt/security.c
+++ libxslt/security.c
@@ -18,6 +18,10 @@
 #include <sys/stat.h>
 #endif
 
+#ifdef HAVE_ERRNO_H
+#include <errno.h>
+#endif
+
 #ifdef HAVE_MATH_H
 #include <math.h>
 #endif
@@ -342,8 +346,16 @@ xsltCheckWritePath(xsltSecurityPrefsPtr sec,
 		}
 	    }
 	    ret = xsltCheckWritePath(sec, ctxt, directory);
-	    if (ret == 1)
+	    if (ret == 1) {
+#ifdef HAVE_ERRNO_H
+		errno = 0;
+#endif
 		ret = mkdir(directory, 0755);
+#ifdef HAVE_ERRNO_H
+		if (ret < 0 && errno == EEXIST)
+		    ret = 0;
+#endif
+            }
 	}
 	xmlFree(directory);
 	if (ret < 0)
-- 
2.25.4