linux-kernel - [PATCH] proc: delete redundant subset=pid check

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Message-ID: <YFYYwIBIkytqnkxP@localhost.localdomain>
Date:   Sat, 20 Mar 2021 18:46:08 +0300
From:   Alexey Dobriyan <adobriyan@...il.com>
To:     akpm@...ux-foundation.org
Cc:     linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        gladkov.alexey@...il.com
Subject: [PATCH] proc: delete redundant subset=pid check

Two checks in lookup and readdir code should be enough to not have
third check in open code.

Can't open what can't be looked up?

Signed-off-by: Alexey Dobriyan <adobriyan@...il.com>
---

 fs/proc/inode.c |    4 ----
 1 file changed, 4 deletions(-)

--- a/fs/proc/inode.c
+++ b/fs/proc/inode.c
@@ -483,7 +483,6 @@ proc_reg_get_unmapped_area(struct file *file, unsigned long orig_addr,
 
 static int proc_reg_open(struct inode *inode, struct file *file)
 {
-	struct proc_fs_info *fs_info = proc_sb_info(inode->i_sb);
 	struct proc_dir_entry *pde = PDE(inode);
 	int rv = 0;
 	typeof_member(struct proc_ops, proc_open) open;
@@ -497,9 +496,6 @@ static int proc_reg_open(struct inode *inode, struct file *file)
 		return rv;
 	}
 
-	if (fs_info->pidonly == PROC_PIDONLY_ON)
-		return -ENOENT;
-
 	/*
 	 * Ensure that
 	 * 1) PDE's ->release hook will be called no matter what