atomic_open(): be paranoid about may_open() return value

It should never return positives; however, with Linux S&M crowd
involved, no bogosity is impossible.  Results would be unpleasant...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --git a/fs/namei.c b/fs/namei.c
index 3951cc4..8d562a7 100644 (file)
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -2920,6 +2920,8 @@ static int atomic_open(struct nameidata *nd, struct dentry *dentry,
                acc_mode = 0;
        }
        error = may_open(&file->f_path, acc_mode, open_flag);
+       if (WARN_ON(error > 0))
+               error = -EINVAL;
 out:
        dput(dentry);
        return error;