From: Michael Kerrisk (man-pages) <mtk.manpages@gmail.com>
Date: Thu, 27 Apr 2017 11:54:11 +0000 (+0200)
Subject: statx: correct error handling of NULL pathname
X-Git-Tag: v4.11~11
X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=59372bbf3abd5b24a7f6f676a3968685c280f955;p=linux.git

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>
---

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)