diff options
| author | Ian Kent <raven@themaw.net> | 2018-08-21 21:51:45 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-09-19 22:43:48 +0200 |
| commit | 8b34a7b14ee73ed625c1d32ae3f5e59ee22fc709 (patch) | |
| tree | 166e80a15e563c63f9e03aa166d967c9d87fcda8 /fs/autofs4 | |
| parent | daf0ca743b28050664c7bd03b6fb46a95d94d248 (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>
Diffstat (limited to 'fs/autofs4')
| -rw-r--r-- | fs/autofs4/autofs_i.h | 4 | ||||
| -rw-r--r-- | fs/autofs4/inode.c | 1 |
2 files changed, 3 insertions, 2 deletions
diff --git a/fs/autofs4/autofs_i.h b/fs/autofs4/autofs_i.h index 4737615f0eaa..ce696d6c4641 100644 --- a/fs/autofs4/autofs_i.h +++ b/fs/autofs4/autofs_i.h @@ -26,6 +26,7 @@ #include <linux/list.h> #include <linux/completion.h> #include <asm/current.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 *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 09e7d68dff02..3c7e727612fa 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> |