[PATCH 14/14] fs,sysctl: remove proc input checks out of sysctl handlers

[Sasha Levin <levinsasha928@gmail.com>]

Simplify sysctl handler by removing user input checks and using the callback
provided by the sysctl table.

Signed-off-by: Sasha Levin <levinsasha928@gmail.com>
---
 fs/pipe.c                 |   11 ++---------
 include/linux/pipe_fs_i.h |    2 +-
 kernel/sysctl.c           |    3 ++-
 3 files changed, 5 insertions(+), 11 deletions(-)

diff --git a/fs/pipe.c b/fs/pipe.c
index 25feaa3..7bb7395 100644
--- a/fs/pipe.c
+++ b/fs/pipe.c
@@ -1186,17 +1186,10 @@ static inline unsigned int round_pipe_size(unsigned int size)
  * This should work even if CONFIG_PROC_FS isn't set, as proc_dointvec_minmax
  * will return an error.
  */
-int pipe_proc_fn(struct ctl_table *table, int write, void __user *buf,
-		 size_t *lenp, loff_t *ppos)
+int pipe_proc_fn(void)
 {
-	int ret;
-
-	ret = proc_dointvec_minmax(table, write, buf, lenp, ppos);
-	if (ret < 0 || !write)
-		return ret;
-
 	pipe_max_size = round_pipe_size(pipe_max_size);
-	return ret;
+	return 0;
 }
 
 /*
diff --git a/include/linux/pipe_fs_i.h b/include/linux/pipe_fs_i.h
index 6d626ff..08e02d8 100644
--- a/include/linux/pipe_fs_i.h
+++ b/include/linux/pipe_fs_i.h
@@ -139,7 +139,7 @@ void pipe_unlock(struct pipe_inode_info *);
 void pipe_double_lock(struct pipe_inode_info *, struct pipe_inode_info *);
 
 extern unsigned int pipe_max_size, pipe_min_size;
-int pipe_proc_fn(struct ctl_table *, int, void __user *, size_t *, loff_t *);
+int pipe_proc_fn(void);
 
 
 /* Drop the inode semaphore and wait for a pipe event, atomically */
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 2104452..35f225b 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -1551,7 +1551,8 @@ static struct ctl_table fs_table[] = {
 		.data		= &pipe_max_size,
 		.maxlen		= sizeof(int),
 		.mode		= 0644,
-		.proc_handler	= &pipe_proc_fn,
+		.proc_handler	= proc_dointvec_minmax,
+		.callback	= &pipe_proc_fn,
 		.extra1		= &pipe_min_size,
 	},
 	{ }
-- 
1.7.8.5

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