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Message-ID: <153475422934.17131.7563724552005298277.stgit@pluto.themaw.net>
Date: Mon, 20 Aug 2018 16:37:09 +0800
From: Ian Kent <raven@...maw.net>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-fsdevel <linux-fsdevel@...r.kernel.org>,
autofs mailing list <autofs@...r.kernel.org>,
Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [PATCH] autofs - fix autofs_sbi() does not check super block type
The autofs_sbi() inline function does not check the super block
magic number to verify it has been given an autofs super block.
Reported-by: syzbot+87c3c541582e56943277@...kaller.appspotmail.com
Signed-off-by: Ian Kent <raven@...maw.net>
---
fs/autofs/autofs_i.h | 4 +++-
fs/autofs/inode.c | 1 -
2 files changed, 3 insertions(+), 2 deletions(-)
diff --git a/fs/autofs/autofs_i.h b/fs/autofs/autofs_i.h
index 9400a9f6318a..5057b9f0f846 100644
--- a/fs/autofs/autofs_i.h
+++ b/fs/autofs/autofs_i.h
@@ -26,6 +26,7 @@
#include <linux/list.h>
#include <linux/completion.h>
#include <linux/file.h>
+#include <linux/magic.h>
/* This is the range of ioctl() numbers we claim as ours */
#define AUTOFS_IOC_FIRST AUTOFS_IOC_READY
@@ -124,7 +125,8 @@ struct autofs_sb_info {
static inline struct autofs_sb_info *autofs_sbi(struct super_block *sb)
{
- return (struct autofs_sb_info *)(sb->s_fs_info);
+ return sb->s_magic != AUTOFS_SUPER_MAGIC ?
+ NULL : (struct autofs_sb_info *)(sb->s_fs_info);
}
static inline struct autofs_info *autofs_dentry_ino(struct dentry *dentry)
diff --git a/fs/autofs/inode.c b/fs/autofs/inode.c
index b51980fc274e..846c052569dd 100644
--- a/fs/autofs/inode.c
+++ b/fs/autofs/inode.c
@@ -10,7 +10,6 @@
#include <linux/seq_file.h>
#include <linux/pagemap.h>
#include <linux/parser.h>
-#include <linux/magic.h>
#include "autofs_i.h"
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