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authorIan Kent <raven@themaw.net>2018-08-22 07:51:45 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2018-08-22 20:52:43 +0300
commit0633da48f0793aeba27f82d30605624416723a91 (patch)
treeee94fd9c9cc86c68eb38cab80c02a34982ac69aa /fs/autofs/autofs_i.h
parent778a33959a8ad4cb1ea2f4c5119f9e1e8b9f9d9b (diff)
downloadlinux-0633da48f0793aeba27f82d30605624416723a91.tar.xz
autofs: fix autofs_sbi() does not check super block type
autofs_sbi() does not check the superblock magic number to verify it has been given an autofs super block. 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>
Diffstat (limited to 'fs/autofs/autofs_i.h')
-rw-r--r--fs/autofs/autofs_i.h4
1 files changed, 3 insertions, 1 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)