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Subject: [PATCH 1/4] nfs-utils: Factor out common structure cleanup calls
From:   Alice Mitchell <ajmitchell@redhat.com>
To:     Linux NFS Mailing list <linux-nfs@vger.kernel.org>
Cc:     Steve Dickson <steved@redhat.com>
Date:   Fri, 10 Jul 2020 17:39:13 +0100
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 support/nfs/conffile.c | 84 +++++++++++++++++++++---------------------
 1 file changed, 41 insertions(+), 43 deletions(-)

diff --git a/support/nfs/conffile.c b/support/nfs/conffile.c
index 3d13610e..aea35917 100644
--- a/support/nfs/conffile.c
+++ b/support/nfs/conffile.c
@@ -128,6 +128,39 @@ conf_hash(const char *s)
 	return hash;
 }
 
+/*
+ * free all the component parts of a conf_binding struct
+ */
+static void free_confbind(struct conf_binding *cb)
+{
+	if (!cb)
+		return;
+	if (cb->section)
+		free(cb->section);
+	if (cb->arg)
+		free(cb->arg);
+	if (cb->tag)
+		free(cb->tag);
+	if (cb->value)
+		free(cb->value);
+	free(cb);
+}
+
+static void free_conftrans(struct conf_trans *ct)
+{
+	if (!ct)
+		return;
+	if (ct->section)
+		free(ct->section);
+	if (ct->arg)
+		free(ct->arg);
+	if (ct->tag)
+		free(ct->tag);
+	if (ct->value)
+		free(ct->value);
+	free(ct);
+}
+
 /*
  * Insert a tag-value combination from LINE (the equal sign is at POS)
  */
@@ -143,11 +176,7 @@ conf_remove_now(const char *section, const char *tag)
 				&& strcasecmp(cb->tag, tag) == 0) {
 			LIST_REMOVE(cb, link);
 			xlog(LOG_INFO,"[%s]:%s->%s removed", section, tag, cb->value);
-			free(cb->section);
-			free(cb->arg);
-			free(cb->tag);
-			free(cb->value);
-			free(cb);
+			free_confbind(cb);
 			return 0;
 		}
 	}
@@ -167,11 +196,7 @@ conf_remove_section_now(const char *section)
 			unseen = 0;
 			LIST_REMOVE(cb, link);
 			xlog(LOG_INFO, "[%s]:%s->%s removed", section, cb->tag, cb->value);
-			free(cb->section);
-			free(cb->arg);
-			free(cb->tag);
-			free(cb->value);
-			free(cb);
+			free_confbind(cb);
 			}
 		}
 	return unseen;
@@ -567,11 +592,7 @@ static void conf_free_bindings(void)
 		for (; cb; cb = next) {
 			next = LIST_NEXT(cb, link);
 			LIST_REMOVE(cb, link);
-			free(cb->section);
-			free(cb->arg);
-			free(cb->tag);
-			free(cb->value);
-			free(cb);
+			free_confbind(cb);
 		}
 		LIST_INIT(&conf_bindings[i]);
 	}
@@ -635,11 +656,7 @@ conf_cleanup(void)
 	for (node = TAILQ_FIRST(&conf_trans_queue); node; node = next) {
 		next = TAILQ_NEXT(node, link);
 		TAILQ_REMOVE (&conf_trans_queue, node, link);
-		if (node->section) free(node->section);
-		if (node->arg) free(node->arg);
-		if (node->tag) free(node->tag);
-		if (node->value) free(node->value);
-		free (node);
+		free_conftrans(node);
 	}
 	TAILQ_INIT(&conf_trans_queue);
 }
@@ -1005,14 +1022,7 @@ conf_set(int transaction, const char *section, const char *arg,
 	return 0;
 
 fail:
-	if (node->tag)
-		free(node->tag);
-	if (node->arg)
-		free(node->arg);
-	if (node->section)
-		free(node->section);
-	if (node)
-		free(node);
+	free_conftrans(node);
 	return 1;
 }
 
@@ -1038,10 +1048,7 @@ conf_remove(int transaction, const char *section, const char *tag)
 	return 0;
 
 fail:
-	if (node && node->section)
-		free (node->section);
-	if (node)
-		free (node);
+	free_conftrans(node);
 	return 1;
 }
 
@@ -1062,8 +1069,7 @@ conf_remove_section(int transaction, const char *section)
 	return 0;
 
 fail:
-	if (node)
-		free(node);
+	free_conftrans(node);
 	return 1;
 }
 
@@ -1094,15 +1100,7 @@ conf_end(int transaction, int commit)
 				}
 			}
 			TAILQ_REMOVE (&conf_trans_queue, node, link);
-			if (node->section)
-				free(node->section);
-			if (node->arg)
-				free(node->arg);
-			if (node->tag)
-				free(node->tag);
-			if (node->value)
-				free(node->value);
-			free (node);
+			free_conftrans(node);
 		}
 	}
 	return 0;
-- 
2.18.1