linux-kernel - [PATCH 4/8] sysctl: Replace nr_entries with ctl_table_size in new

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Date: Tue, 04 Jun 2024 08:29:22 +0200
From: Joel Granados via B4 Relay <devnull+j.granados.samsung.com@...nel.org>
To: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, 
 Will Deacon <will@...nel.org>, Waiman Long <longman@...hat.com>, 
 Boqun Feng <boqun.feng@...il.com>, Suren Baghdasaryan <surenb@...gle.com>, 
 Kent Overstreet <kent.overstreet@...ux.dev>, 
 Andrew Morton <akpm@...ux-foundation.org>, 
 Luis Chamberlain <mcgrof@...nel.org>, Kees Cook <keescook@...omium.org>, 
 Joel Granados <j.granados@...sung.com>, 
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>
Cc: linux-kernel@...r.kernel.org, linux-mm@...ck.org, 
 linux-fsdevel@...r.kernel.org, netdev@...r.kernel.org
Subject: [PATCH 4/8] sysctl: Replace nr_entries with ctl_table_size in
 new_links

From: Joel Granados <j.granados@...sung.com>

The number of ctl_table entries (nr_entries) calculation was previously
based on the ctl_table_size and the sentinel element. Since the
sentinels have been removed, we remove the calculation and just use the
ctl_table_size from the ctl_table_header.

Signed-off-by: Joel Granados <j.granados@...sung.com>
---
 fs/proc/proc_sysctl.c | 14 ++++++--------
 1 file changed, 6 insertions(+), 8 deletions(-)

diff --git a/fs/proc/proc_sysctl.c b/fs/proc/proc_sysctl.c
index d4ba7ad9dbe0..1babb54347a4 100644
--- a/fs/proc/proc_sysctl.c
+++ b/fs/proc/proc_sysctl.c
@@ -1154,18 +1154,16 @@ static struct ctl_table_header *new_links(struct ctl_dir *dir, struct ctl_table_
 	struct ctl_table_header *links;
 	struct ctl_node *node;
 	char *link_name;
-	int nr_entries, name_bytes;
+	int name_bytes;

 	name_bytes = 0;
-	nr_entries = 0;
 	list_for_each_table_entry(entry, head) {
-		nr_entries++;
 		name_bytes += strlen(entry->procname) + 1;
 	}

 	links = kzalloc(sizeof(struct ctl_table_header) +
-			sizeof(struct ctl_node)*nr_entries +
-			sizeof(struct ctl_table)*(nr_entries + 1) +
+			sizeof(struct ctl_node)*head->ctl_table_size +
+			sizeof(struct ctl_table)*(head->ctl_table_size + 1) +
 			name_bytes,
 			GFP_KERNEL);

@@ -1173,8 +1171,8 @@ static struct ctl_table_header *new_links(struct ctl_dir *dir, struct ctl_table_
 		return NULL;

 	node = (struct ctl_node *)(links + 1);
-	link_table = (struct ctl_table *)(node + nr_entries);
-	link_name = (char *)&link_table[nr_entries + 1];
+	link_table = (struct ctl_table *)(node + head->ctl_table_size);
+	link_name = (char *)&link_table[head->ctl_table_size + 1];
 	link = link_table;

 	list_for_each_table_entry(entry, head) {
@@ -1188,7 +1186,7 @@ static struct ctl_table_header *new_links(struct ctl_dir *dir, struct ctl_table_
 	}
 	init_header(links, dir->header.root, dir->header.set, node, link_table,
 		    head->ctl_table_size);
-	links->nreg = nr_entries;
+	links->nreg = head->ctl_table_size;

 	return links;
 }

-- 
2.43.0