netdev - [PATCH v2 -next] neigh: Adjustment calculation method of neighbour path symbols

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Date:   Mon, 26 Oct 2020 10:21:26 +0800
From:   Zhang Qilong <zhangqilong3@...wei.com>
To:     <joe@...ches.com>, <vvs@...tuozzo.com>, <davem@...emloft.net>,
        <kuba@...nel.org>
CC:     <lirongqing@...du.com>, <roopa@...ulusnetworks.com>,
        <netdev@...r.kernel.org>
Subject: [PATCH v2 -next] neigh: Adjustment calculation method of neighbour path symbols

Using size of "net//neigh/" is not clear, the use
of stitching("net/" + /neigh") should be clearer.

Signed-off-by: Zhang Qilong <zhangqilong3@...wei.com>
---
 net/core/neighbour.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/net/core/neighbour.c b/net/core/neighbour.c
index 8e39e28b0a8d..0474e73c4f9f 100644
--- a/net/core/neighbour.c
+++ b/net/core/neighbour.c
@@ -3623,7 +3623,14 @@ int neigh_sysctl_register(struct net_device *dev, struct neigh_parms *p,
 	int i;
 	struct neigh_sysctl_table *t;
 	const char *dev_name_source;
-	char neigh_path[ sizeof("net//neigh/") + IFNAMSIZ + IFNAMSIZ ];
+
+	/*
+	 * The path pattern is as follows
+	 * "net/%s/neigh/%s", minusing one
+	 * is for unnecessary terminators.
+	 */
+	char neigh_path[sizeof("net/") - 1 + IFNAMSIZ +
+			sizeof("/neigh/") + IFNAMSIZ];
 	char *p_name;
 
 	t = kmemdup(&neigh_sysctl_template, sizeof(*t), GFP_KERNEL);
-- 
2.17.1