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authorIan Kent <raven@themaw.net>2018-08-21 21:51:45 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-09-19 22:47:16 +0200
commit4e7f07396a5f093859a29c83a4dfc9e8fd34b4e0 (patch)
treee8dae7fc4e5fee6d37f1fe08e02abd3bfd62e90a
parent3fe958010928c6e5e6dee1e9cff9bd47939ea808 (diff)
autofs: fix autofs_sbi() does not check super block type
commit 0633da48f0793aeba27f82d30605624416723a91 upstream. autofs_sbi() does not check the superblock magic number to verify it has been given an autofs super block. Backport Note: autofs4 has been renamed to autofs upstream. As a result the upstream patch does not apply cleanly onto 4.14.y. Link: http://lkml.kernel.org/r/153475422934.17131.7563724552005298277.stgit@pluto.themaw.net Reported-by: <syzbot+87c3c541582e56943277@syzkaller.appspotmail.com> Signed-off-by: Ian Kent <raven@themaw.net> Reviewed-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Zubin Mithra <zsm@chromium.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--fs/autofs4/autofs_i.h4
-rw-r--r--fs/autofs4/inode.c1
2 files changed, 3 insertions, 2 deletions
diff --git a/fs/autofs4/autofs_i.h b/fs/autofs4/autofs_i.h
index a1fba4285277..42f863346409 100644
--- a/fs/autofs4/autofs_i.h
+++ b/fs/autofs4/autofs_i.h
@@ -14,6 +14,7 @@
#include <linux/mutex.h>
#include <linux/spinlock.h>
#include <linux/list.h>
+#include <linux/magic.h>
/* This is the range of ioctl() numbers we claim as ours */
#define AUTOFS_IOC_FIRST AUTOFS_IOC_READY
@@ -123,7 +124,8 @@ struct autofs_sb_info {
static inline struct autofs_sb_info *autofs4_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 *autofs4_dentry_ino(struct dentry *dentry)
diff --git a/fs/autofs4/inode.c b/fs/autofs4/inode.c
index 438b5bf675b6..ce0c6ea96a87 100644
--- a/fs/autofs4/inode.c
+++ b/fs/autofs4/inode.c
@@ -14,7 +14,6 @@
#include <linux/pagemap.h>
#include <linux/parser.h>
#include <linux/bitops.h>
-#include <linux/magic.h>
#include "autofs_i.h"
#include <linux/module.h>