diff options
| author | Ian Kent <raven@themaw.net> | 2018-08-21 21:51:45 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2018-08-22 10:52:43 -0700 |
| commit | 0633da48f0793aeba27f82d30605624416723a91 (patch) | |
| tree | ee94fd9c9cc86c68eb38cab80c02a34982ac69aa /fs/autofs | |
| parent | 778a33959a8ad4cb1ea2f4c5119f9e1e8b9f9d9b (diff) | |
| download | linux-stable-0633da48f0793aeba27f82d30605624416723a91.tar.gz linux-stable-0633da48f0793aeba27f82d30605624416723a91.tar.bz2 linux-stable-0633da48f0793aeba27f82d30605624416723a91.zip | |
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')
| -rw-r--r-- | fs/autofs/autofs_i.h | 4 | ||||
| -rw-r--r-- | 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" |