From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Benjamin Marzinski <bmarzins@redhat.com>
Date: Wed, 13 Apr 2022 23:27:35 -0500
Subject: [PATCH] libmultipath: steal the src string pointer in merge_str()

Instead of allocating a copy when the original string is going to be
freed right after the merge, just steal the pointer. Also, merge_mpe()
can't get called with NULL arguments.

Signed-off-by: Benjamin Marzinski <bmarzins@redhat.com>
Reviewed-by: Martin Wilck <mwilck@suse.com>
---
 libmultipath/config.c | 16 +++++-----------
 1 file changed, 5 insertions(+), 11 deletions(-)

diff --git a/libmultipath/config.c b/libmultipath/config.c
index abbddaf1..aa79561e 100644
--- a/libmultipath/config.c
+++ b/libmultipath/config.c
@@ -323,9 +323,9 @@ set_param_str(const char * str)
 }
 
 #define merge_str(s) \
-	if (!dst->s && src->s) { \
-		if (!(dst->s = set_param_str(src->s))) \
-			return 1; \
+	if (!dst->s && src->s && strlen(src->s)) { \
+		dst->s = src->s; \
+		src->s = NULL; \
 	}
 
 #define merge_num(s) \
@@ -333,7 +333,7 @@ set_param_str(const char * str)
 		dst->s = src->s
 
 
-static int
+static void
 merge_hwe (struct hwentry * dst, struct hwentry * src)
 {
 	char id[SCSI_VENDOR_SIZE+PATH_PRODUCT_SIZE];
@@ -385,15 +385,11 @@ merge_hwe (struct hwentry * dst, struct hwentry * src)
 	reconcile_features_with_options(id, &dst->features,
 					&dst->no_path_retry,
 					&dst->retain_hwhandler);
-	return 0;
 }
 
-static int
+static void
 merge_mpe(struct mpentry *dst, struct mpentry *src)
 {
-	if (!dst || !src)
-		return 1;
-
 	merge_str(alias);
 	merge_str(uid_attribute);
 	merge_str(getuid);
@@ -435,8 +431,6 @@ merge_mpe(struct mpentry *dst, struct mpentry *src)
 	merge_num(uid);
 	merge_num(gid);
 	merge_num(mode);
-
-	return 0;
 }
 
 void merge_mptable(vector mptable)