Prevent writing to NULL if buffer is NULL

diff --git a/cups/snprintf.c b/cups/snprintf.c
index 3c468571879251ac050316326464deb48ca69739..e4eb3e9757c96d4d1042e2947da52179bcdf2087 100644 (file)
--- a/cups/snprintf.c
+++ b/cups/snprintf.c
@@ -1,6 +1,7 @@
 /*
  * snprintf functions for CUPS.
  *
+ * Copyright © 2021 by OpenPrinting
  * Copyright © 2007-2019 by Apple Inc.
  * Copyright © 1997-2007 by Easy Software Products.
  *
@@ -322,7 +323,8 @@ _cups_vsnprintf(char       *buffer, /* O - Output buffer */
   * Nul-terminate the string and return the number of characters needed.
   */
 
-  *bufptr = '\0';
+  if (bufptr)
+       *bufptr = '\0';
 
   return (bytes);
 }