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: v3.0.101~6
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0ffc34c0d09a7d36ff84d1ac506a352a06ef5e4e;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 9cf04a1189659..a133c3ef2be0c 100644
--- a/fs/statfs.c
+++ b/fs/statfs.c
@@ -86,7 +86,7 @@ int user_statfs(const char __user *pathname, struct kstatfs *st)
 
 int fd_statfs(int fd, struct kstatfs *st)
 {
-	struct file *file = fget(fd);
+	struct file *file = fget_raw(fd);
 	int error = -EBADF;
 	if (file) {
 		error = vfs_statfs(&file->f_path, st);