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>

1 files changed, 2 insertions, 0 deletions

diff --git a/fs/namei.c b/fs/namei.c
index 3951cc4..8d562a7 100644
--- 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;