linux-kernel - [PATCH] debugfs: allow bad parent pointers to be passed in

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Message-ID: <20150330125915.GA1523@kroah.com>
Date:	Mon, 30 Mar 2015 14:59:15 +0200
From:	Greg KH <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Alex Elder <elder@...aro.org>,
	Viresh Kumar <viresh.kumar@...aro.org>
Subject: [PATCH] debugfs: allow bad parent pointers to be passed in

If something went wrong with creating a debugfs file/symlink/directory,
that value could be passed down into debugfs again as a parent dentry.
To make caller code simpler, just error out if this happens, and don't
crash the kernel.

Reported-by: Alex Elder <elder@...aro.org>
Cc: Viresh Kumar <viresh.kumar@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/debugfs/inode.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/fs/debugfs/inode.c
+++ b/fs/debugfs/inode.c
@@ -254,6 +254,9 @@ static struct dentry *start_creating(con
 
 	pr_debug("debugfs: creating file '%s'\n",name);
 
+	if (IS_ERR(parent))
+		return parent;
+
 	error = simple_pin_fs(&debug_fs_type, &debugfs_mount,
 			      &debugfs_mount_count);
 	if (error)
--
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