linux-kernel - [PATCH 4.14 42/44] cxl_getfile(): fix double-iput() on alloc

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Message-Id: <20180723122439.434571090@linuxfoundation.org>
Date:   Mon, 23 Jul 2018 14:25:18 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Al Viro <viro@...iv.linux.org.uk>
Subject: [PATCH 4.14 42/44] cxl_getfile(): fix double-iput() on alloc_file() failures

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

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

commit d202797f480c0e5918e7642d6716cdc62b3ab5c9 upstream.

Doing iput() after path_put() is wrong.

Cc: stable@...r.kernel.org
Acked-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/misc/cxl/api.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

--- a/drivers/misc/cxl/api.c
+++ b/drivers/misc/cxl/api.c
@@ -102,15 +102,15 @@ static struct file *cxl_getfile(const ch
 	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: