From c9e15f25f514a76d906be01e621f400cdee94558 Mon Sep 17 00:00:00 2001 From: Greg KH Date: Mon, 30 Mar 2015 14:59:15 +0200 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 Reviewed-by: Viresh Kumar Signed-off-by: Greg Kroah-Hartman Reviewed-by: Alex Elder --- fs/debugfs/inode.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/fs/debugfs/inode.c b/fs/debugfs/inode.c index 96400ab42d13..61e72d44cf94 100644 --- a/fs/debugfs/inode.c +++ b/fs/debugfs/inode.c @@ -254,6 +254,9 @@ static struct dentry *start_creating(const char *name, struct dentry *parent) 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) -- 2.20.1