linux-kernel - [PATCH] proc: fix return value of proc_reg

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Message-ID: <20080830053412.GB25179@x200.localdomain>
Date:	Sat, 30 Aug 2008 09:34:12 +0400
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	akpm@...l.org
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH] proc: fix return value of proc_reg_open() in "too late"
	case

If ->open() wasn't called, returning 0 is misleading and, theoretically,
oopsable:
1. remove_proc_entry clears ->proc_fops, drops lock,
2. ->open "succeeds",
3. ->release oopses, because it assumes ->open was called (single_release()).

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

 fs/proc/inode.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/fs/proc/inode.c
+++ b/fs/proc/inode.c
@@ -350,7 +350,7 @@ static int proc_reg_open(struct inode *inode, struct file *file)
 	if (!pde->proc_fops) {
 		spin_unlock(&pde->pde_unload_lock);
 		kfree(pdeo);
-		return rv;
+		return -EINVAL;
 	}
 	pde->pde_users++;
 	open = pde->proc_fops->open;

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