linux-kernel - [PATCH net-next v3 1/3] string_helpers: Move string_is

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Message-Id: <20230208133153.22528-1-andriy.shevchenko@linux.intel.com>
Date:   Wed,  8 Feb 2023 15:31:51 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Xin Long <lucien.xin@...il.com>, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, dev@...nvswitch.org,
        tipc-discussion@...ts.sourceforge.net
Cc:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Pravin B Shelar <pshelar@....org>,
        Jon Maloy <jmaloy@...hat.com>,
        Ying Xue <ying.xue@...driver.com>,
        Simon Horman <simon.horman@...igine.com>
Subject: [PATCH net-next v3 1/3] string_helpers: Move string_is_valid() to the header

Move string_is_valid() to the header for wider use.

While at it, rename to string_is_terminated() to be
precise about its semantics.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Reviewed-by: Simon Horman <simon.horman@...igine.com>
---
v3: renamed to string_is_terminated (Jakub)
v2: added tag and updated subject (Simon)
 include/linux/string_helpers.h |  5 +++++
 net/tipc/netlink_compat.c      | 16 ++++++----------
 2 files changed, 11 insertions(+), 10 deletions(-)

diff --git a/include/linux/string_helpers.h b/include/linux/string_helpers.h
index 8530c7328269..fae6beaaa217 100644
--- a/include/linux/string_helpers.h
+++ b/include/linux/string_helpers.h
@@ -11,6 +11,11 @@ struct device;
 struct file;
 struct task_struct;
 
+static inline bool string_is_terminated(const char *s, int len)
+{
+	return memchr(s, '\0', len) ? true : false;
+}
+
 /* Descriptions of the types of units to
  * print in */
 enum string_size_units {
diff --git a/net/tipc/netlink_compat.c b/net/tipc/netlink_compat.c
index dfea27a906f2..9b47c8409231 100644
--- a/net/tipc/netlink_compat.c
+++ b/net/tipc/netlink_compat.c
@@ -39,6 +39,7 @@
 #include "node.h"
 #include "net.h"
 #include <net/genetlink.h>
+#include <linux/string_helpers.h>
 #include <linux/tipc_config.h>
 
 /* The legacy API had an artificial message length limit called
@@ -173,11 +174,6 @@ static struct sk_buff *tipc_get_err_tlv(char *str)
 	return buf;
 }
 
-static inline bool string_is_valid(char *s, int len)
-{
-	return memchr(s, '\0', len) ? true : false;
-}
-
 static int __tipc_nl_compat_dumpit(struct tipc_nl_compat_cmd_dump *cmd,
 				   struct tipc_nl_compat_msg *msg,
 				   struct sk_buff *arg)
@@ -445,7 +441,7 @@ static int tipc_nl_compat_bearer_enable(struct tipc_nl_compat_cmd_doit *cmd,
 		return -EINVAL;
 
 	len = min_t(int, len, TIPC_MAX_BEARER_NAME);
-	if (!string_is_valid(b->name, len))
+	if (!string_is_terminated(b->name, len))
 		return -EINVAL;
 
 	if (nla_put_string(skb, TIPC_NLA_BEARER_NAME, b->name))
@@ -486,7 +482,7 @@ static int tipc_nl_compat_bearer_disable(struct tipc_nl_compat_cmd_doit *cmd,
 		return -EINVAL;
 
 	len = min_t(int, len, TIPC_MAX_BEARER_NAME);
-	if (!string_is_valid(name, len))
+	if (!string_is_terminated(name, len))
 		return -EINVAL;
 
 	if (nla_put_string(skb, TIPC_NLA_BEARER_NAME, name))
@@ -584,7 +580,7 @@ static int tipc_nl_compat_link_stat_dump(struct tipc_nl_compat_msg *msg,
 		return -EINVAL;
 
 	len = min_t(int, len, TIPC_MAX_LINK_NAME);
-	if (!string_is_valid(name, len))
+	if (!string_is_terminated(name, len))
 		return -EINVAL;
 
 	if (strcmp(name, nla_data(link[TIPC_NLA_LINK_NAME])) != 0)
@@ -819,7 +815,7 @@ static int tipc_nl_compat_link_set(struct tipc_nl_compat_cmd_doit *cmd,
 		return -EINVAL;
 
 	len = min_t(int, len, TIPC_MAX_LINK_NAME);
-	if (!string_is_valid(lc->name, len))
+	if (!string_is_terminated(lc->name, len))
 		return -EINVAL;
 
 	media = tipc_media_find(lc->name);
@@ -856,7 +852,7 @@ static int tipc_nl_compat_link_reset_stats(struct tipc_nl_compat_cmd_doit *cmd,
 		return -EINVAL;
 
 	len = min_t(int, len, TIPC_MAX_LINK_NAME);
-	if (!string_is_valid(name, len))
+	if (!string_is_terminated(name, len))
 		return -EINVAL;
 
 	if (nla_put_string(skb, TIPC_NLA_LINK_NAME, name))
-- 
2.39.1