Protect against NULL collection values (<rdar://problem/17903871>)

git-svn-id: svn+ssh://src.apple.com/svn/cups/cups.org/trunk@12193 a1ca3aef-8c08-0410-bb20-df032aa958be

diff --git a/cups/ipp-support.c b/cups/ipp-support.c
index 895e6fc430d59b9fb47da6b923f6deb068d16ddb..1964ad00b8bc0148733f1f04a74436be4411f110 100644 (file)
--- a/cups/ipp-support.c
+++ b/cups/ipp-support.c
@@ -2223,6 +2223,14 @@ ipp_col_string(ipp_t  *col,              /* I - Collection attribute */
   ipp_attribute_t      *attr;          /* Current member attribute */
 
 
+  if (!col)
+  {
+    if (buffer)
+      *buffer = '\0';
+
+    return (0);
+  }
+
   bufptr = buffer;
   bufend = buffer + bufsize - 1;