linux-kernel - [PATCH 5.15 830/917] seq_file: fix passing wrong private data

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Date:   Mon, 15 Nov 2021 18:05:25 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Muchun Song <songmuchun@...edance.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Florent Revest <revest@...omium.org>,
        Alexey Dobriyan <adobriyan@...il.com>,
        Christian Brauner <christian.brauner@...ntu.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.15 830/917] seq_file: fix passing wrong private data

From: Muchun Song <songmuchun@...edance.com>

[ Upstream commit 10a6de19cad6efb9b49883513afb810dc265fca2 ]

DEFINE_PROC_SHOW_ATTRIBUTE() is supposed to be used to define a series
of functions and variables to register proc file easily. And the users
can use proc_create_data() to pass their own private data and get it
via seq->private in the callback. Unfortunately, the proc file system
use PDE_DATA() to get private data instead of inode->i_private. So fix
it. Fortunately, there only one user of it which does not pass any
private data, so this bug does not break any in-tree codes.

Link: https://lkml.kernel.org/r/20211029032638.84884-1-songmuchun@bytedance.com
Fixes: 97a32539b956 ("proc: convert everything to "struct proc_ops"")
Signed-off-by: Muchun Song <songmuchun@...edance.com>
Cc: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc: Stephen Rothwell <sfr@...b.auug.org.au>
Cc: Florent Revest <revest@...omium.org>
Cc: Alexey Dobriyan <adobriyan@...il.com>
Cc: Christian Brauner <christian.brauner@...ntu.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 include/linux/seq_file.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/seq_file.h b/include/linux/seq_file.h
index dd99569595fd3..5733890df64f5 100644
--- a/include/linux/seq_file.h
+++ b/include/linux/seq_file.h
@@ -194,7 +194,7 @@ static const struct file_operations __name ## _fops = {			\
 #define DEFINE_PROC_SHOW_ATTRIBUTE(__name)				\
 static int __name ## _open(struct inode *inode, struct file *file)	\
 {									\
-	return single_open(file, __name ## _show, inode->i_private);	\
+	return single_open(file, __name ## _show, PDE_DATA(inode));	\
 }									\
 									\
 static const struct proc_ops __name ## _proc_ops = {			\
-- 
2.33.0