krb5/Modernize-exit-path-in-gss_krb5int_copy_ccache.patch

From 8fe3c4bde435c68a74c8075661a432cd1d3c17b9 Mon Sep 17 00:00:00 2001
From: Robbie Harwood <rharwood@redhat.com>
Date: Thu, 2 May 2019 14:32:33 -0400
Subject: [PATCH] Modernize exit path in gss_krb5int_copy_ccache()

Move to a single lock / single unlock paradigm, and eliminate some
dead code in the old error handling.

(cherry picked from commit 1b89e3d8e949f52901bce74c9afc7a1a64099520)
---
 src/lib/gssapi/krb5/copy_ccache.c | 31 ++++++++++++-------------------
 1 file changed, 12 insertions(+), 19 deletions(-)

diff --git a/src/lib/gssapi/krb5/copy_ccache.c b/src/lib/gssapi/krb5/copy_ccache.c
index 027ed4847..2b2806e70 100644
--- a/src/lib/gssapi/krb5/copy_ccache.c
+++ b/src/lib/gssapi/krb5/copy_ccache.c
@@ -9,7 +9,7 @@ gss_krb5int_copy_ccache(OM_uint32 *minor_status,
 {
     krb5_gss_cred_id_t k5creds;
     krb5_error_code code;
-    krb5_context context;
+    krb5_context context = NULL;
     krb5_ccache out_ccache;
 
     assert(value->length == sizeof(out_ccache));
@@ -23,30 +23,23 @@ gss_krb5int_copy_ccache(OM_uint32 *minor_status,
     k5creds = (krb5_gss_cred_id_t) *cred_handle;
     k5_mutex_lock(&k5creds->lock);
     if (k5creds->usage == GSS_C_ACCEPT) {
-        k5_mutex_unlock(&k5creds->lock);
-        *minor_status = (OM_uint32) G_BAD_USAGE;
-        return(GSS_S_FAILURE);
+        code = G_BAD_USAGE;
+        goto cleanup;
     }
 
     code = krb5_gss_init_context(&context);
-    if (code) {
-        k5_mutex_unlock(&k5creds->lock);
-        *minor_status = code;
-        return GSS_S_FAILURE;
-    }
+    if (code)
+        goto cleanup;
 
     code = krb5_cc_copy_creds(context, k5creds->ccache, out_ccache);
-    if (code) {
-        k5_mutex_unlock(&k5creds->lock);
-        *minor_status = code;
-        save_error_info(*minor_status, context);
-        krb5_free_context(context);
-        return(GSS_S_FAILURE);
-    }
+
+cleanup:
     k5_mutex_unlock(&k5creds->lock);
     *minor_status = code;
-    if (code)
-        save_error_info(*minor_status, context);
-    krb5_free_context(context);
+    if (context != NULL) {
+        if (code)
+            save_error_info(*minor_status, context);
+        krb5_free_context(context);
+    }
     return code ? GSS_S_FAILURE : GSS_S_COMPLETE;
 }