From 59372bbf3abd5b24a7f6f676a3968685c280f955 Mon Sep 17 00:00:00 2001
From: "Michael Kerrisk (man-pages)" <mtk.manpages@gmail.com>
Date: Thu, 27 Apr 2017 13:54:11 +0200
Subject: statx: correct error handling of NULL pathname
The change in commit 1e2f82d1e9d1 ("statx: Kill fd-with-NULL-path
support in favour of AT_EMPTY_PATH") to error on a NULL pathname to
statx() is inconsistent.
It results in the error EINVAL for a NULL pathname. Other system calls
with similar APIs (fchownat(), fstatat(), linkat()), return EFAULT.
The solution is simply to remove the EINVAL check. As I already pointed
out in [1], user_path_at*() and filename_lookup() will handle the NULL
pathname as per the other APIs, to correctly produce the error EFAULT.
[1] https://lkml.org/lkml/2017/4/26/561
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
Cc: David Howells <dhowells@redhat.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Eric Sandeen <sandeen@sandeen.net>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
fs/stat.c | 2 --
1 file changed, 2 deletions(-)
(limited to 'fs/stat.c')
diff --git a/fs/stat.c b/fs/stat.c
index 3d85747bd86e..a257b872a53d 100644
--- a/fs/stat.c
+++ b/fs/stat.c
@@ -567,8 +567,6 @@ SYSCALL_DEFINE5(statx,
return -EINVAL;
if ((flags & AT_STATX_SYNC_TYPE) == AT_STATX_SYNC_TYPE)
return -EINVAL;
- if (!filename)
- return -EINVAL;
error = vfs_statx(dfd, filename, flags, &stat, mask);
if (error)
--
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