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Message-Id: <20190228151105.11277-27-sashal@kernel.org>
Date: Thu, 28 Feb 2019 10:10:28 -0500
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Omar Sandoval <osandov@...com>, Jens Axboe <axboe@...com>,
Sasha Levin <sashal@...nel.org>
Subject: [PATCH AUTOSEL 4.19 27/64] debugfs: debugfs_lookup() should return NULL if not found
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
[ Upstream commit 37ea7b630ae5cdea4e8ff381d9d23abfef5939e6 ]
Lots of callers of debugfs_lookup() were just checking NULL to see if
the file/directory was found or not. By changing this in ff9fb72bc077
("debugfs: return error values, not NULL") we caused some subsystems to
easily crash.
Fixes: ff9fb72bc077 ("debugfs: return error values, not NULL")
Reported-by: syzbot+b382ba6a802a3d242790@...kaller.appspotmail.com
Reported-by: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
Cc: Omar Sandoval <osandov@...com>
Cc: Jens Axboe <axboe@...com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
fs/debugfs/inode.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
diff --git a/fs/debugfs/inode.c b/fs/debugfs/inode.c
index b16f8035b1af7..29c68c5d44d5f 100644
--- a/fs/debugfs/inode.c
+++ b/fs/debugfs/inode.c
@@ -254,8 +254,8 @@ MODULE_ALIAS_FS("debugfs");
* @parent: a pointer to the parent dentry of the file.
*
* This function will return a pointer to a dentry if it succeeds. If the file
- * doesn't exist or an error occurs, %ERR_PTR(-ERROR) will be returned. The
- * returned dentry must be passed to dput() when it is no longer needed.
+ * doesn't exist or an error occurs, %NULL will be returned. The returned
+ * dentry must be passed to dput() when it is no longer needed.
*
* If debugfs is not enabled in the kernel, the value -%ENODEV will be
* returned.
@@ -265,17 +265,17 @@ struct dentry *debugfs_lookup(const char *name, struct dentry *parent)
struct dentry *dentry;
if (IS_ERR(parent))
- return parent;
+ return NULL;
if (!parent)
parent = debugfs_mount->mnt_root;
dentry = lookup_one_len_unlocked(name, parent, strlen(name));
if (IS_ERR(dentry))
- return dentry;
+ return NULL;
if (!d_really_is_positive(dentry)) {
dput(dentry);
- return ERR_PTR(-EINVAL);
+ return NULL;
}
return dentry;
}
--
2.19.1
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