From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Mon, 30 Sep 2013 15:35:10 +0000 (-0700)
Subject: vfs: allow O_PATH file descriptors for fstatfs()
X-Git-Tag: v3.11.6~45
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=97e439cda6547140f98285e8c000f5e2e4a47925;p=thirdparty%2Fkernel%2Fstable.git

vfs: allow O_PATH file descriptors for fstatfs()

commit 9d05746e7b16d8565dddbe3200faa1e669d23bbf upstream.

Olga reported that file descriptors opened with O_PATH do not work with
fstatfs(), found during further development of ksh93's thread support.

There is no reason to not allow O_PATH file descriptors here (fstatfs is
very much a path operation), so use "fdget_raw()".  See commit
55815f70147d ("vfs: make O_PATH file descriptors usable for 'fstat()'")
for a very similar issue reported for fstat() by the same team.

Reported-and-tested-by: ольга крыжановская <olga.kryzhanovska@gmail.com>
Acked-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/fs/statfs.c b/fs/statfs.c
index c219e733f5533..083dc0ac91408 100644
--- a/fs/statfs.c
+++ b/fs/statfs.c
@@ -94,7 +94,7 @@ retry:
 
 int fd_statfs(int fd, struct kstatfs *st)
 {
-	struct fd f = fdget(fd);
+	struct fd f = fdget_raw(fd);
 	int error = -EBADF;
 	if (f.file) {
 		error = vfs_statfs(&f.file->f_path, st);