linux-kernel - [RFC][PATCH 02/42] cxl_getfile(): fix double-iput() on alloc

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Message-Id: <20180711022206.12571-2-viro@ZenIV.linux.org.uk>
Date:   Wed, 11 Jul 2018 03:21:26 +0100
From:   Al Viro <viro@...IV.linux.org.uk>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        Miklos Szeredi <mszeredi@...hat.com>, stable@...nel.org
Subject: [RFC][PATCH 02/42] cxl_getfile(): fix double-iput() on alloc_file() failures

From: Al Viro <viro@...iv.linux.org.uk>

Doing iput() after path_put() is wrong.

Cc: stable@...nel.org
Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
---
 drivers/misc/cxl/api.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/misc/cxl/api.c b/drivers/misc/cxl/api.c
index 753b1a698fc4..6b16946f9b05 100644
--- a/drivers/misc/cxl/api.c
+++ b/drivers/misc/cxl/api.c
@@ -103,15 +103,15 @@ static struct file *cxl_getfile(const char *name,
 	d_instantiate(path.dentry, inode);
 
 	file = alloc_file(&path, OPEN_FMODE(flags), fops);
-	if (IS_ERR(file))
-		goto err_dput;
+	if (IS_ERR(file)) {
+		path_put(&path);
+		goto err_fs;
+	}
 	file->f_flags = flags & (O_ACCMODE | O_NONBLOCK);
 	file->private_data = priv;
 
 	return file;
 
-err_dput:
-	path_put(&path);
 err_inode:
 	iput(inode);
 err_fs:
-- 
2.11.0