devpts: Make devpts_kill_sb safe if fsi is NULL

Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/devpts/inode.c b/fs/devpts/inode.c
index a48b40b..e058ec6 100644 (file)
--- a/fs/devpts/inode.c
+++ b/fs/devpts/inode.c
@@ -458,7 +458,8 @@ static void devpts_kill_sb(struct super_block *sb)
 {
        struct pts_fs_info *fsi = DEVPTS_SB(sb);
 
-       ida_destroy(&fsi->allocated_ptys);
+       if (fsi)
+               ida_destroy(&fsi->allocated_ptys);
        kfree(fsi);
        kill_litter_super(sb);
 }