krb5 commit [krb5-1.13]: Fix leak in gss_display_name() for non-MN names

[Tom Yu]

https://github.com/krb5/krb5/commit/7dd659b97df5799d429b8afcbb0b6b804d3feabf
commit 7dd659b97df5799d429b8afcbb0b6b804d3feabf
Author: Greg Hudson <ghudson at mit.edu>
Date:   Tue Jun 28 12:28:11 2016 -0400

    Fix leak in gss_display_name() for non-MN names
    
    RFC 2744 states that the gss_display_name() output_name_type result is
    "a pointer into static storage, and should be treated as read-only by
    the caller (in particular, the application should not attempt to free
    it)".  For non-mechanism names, we were making a copy of the name type
    from the union name structure, causing a memory leak; stop doing that.
    
    (cherry picked from commit 20fcbf2cb820df0d31e66bb11f64fb50a31008f5)
    
    ticket: 8439
    version_fixed: 1.13.7

 src/lib/gssapi/mechglue/g_dsp_name.c |   27 ++++-----------------------
 1 files changed, 4 insertions(+), 23 deletions(-)

diff --git a/src/lib/gssapi/mechglue/g_dsp_name.c b/src/lib/gssapi/mechglue/g_dsp_name.c
index 825bf4d..21867c8 100644
--- a/src/lib/gssapi/mechglue/g_dsp_name.c
+++ b/src/lib/gssapi/mechglue/g_dsp_name.c
@@ -102,36 +102,17 @@ gss_OID *		output_name_type;
 					    output_name_type));
     }
 
-    /*
-     * copy the value of the external_name component of the union
-     * name into the output_name_buffer and point the output_name_type
-     * to the name_type component of union_name
-     */
-    if (output_name_type != NULL &&
-	union_name->name_type != GSS_C_NULL_OID) {
-	major_status = generic_gss_copy_oid(minor_status,
-					    union_name->name_type,
-					    output_name_type);
-	if (major_status != GSS_S_COMPLETE) {
-	    map_errcode(minor_status);
-	    return (major_status);
-	}
-    }
-
     if ((output_name_buffer->value =
-	 gssalloc_malloc(union_name->external_name->length + 1)) == NULL) {
-	if (output_name_type && *output_name_type != GSS_C_NULL_OID) {
-	    (void) generic_gss_release_oid(minor_status,
-					   output_name_type);
-	    *output_name_type = NULL;
-	}
+	 gssalloc_malloc(union_name->external_name->length + 1)) == NULL)
 	return (GSS_S_FAILURE);
-    }
     output_name_buffer->length = union_name->external_name->length;
     (void) memcpy(output_name_buffer->value,
 		  union_name->external_name->value,
 		  union_name->external_name->length);
     ((char *)output_name_buffer->value)[output_name_buffer->length] = '\0';
 
+    if (output_name_type != NULL)
+	*output_name_type = union_name->name_type;
+
     return(GSS_S_COMPLETE);
 }