From: Miklos Szeredi <mszeredi@suse.cz>
Date: Tue, 3 Sep 2013 12:28:38 +0000 (+0200)
Subject: fuse: readdir: check for slash in names
X-Git-Tag: v3.2.52~98
X-Git-Url: http://git.hungrycats.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b5f9e3533584d2fb6c90c63da767b85421b07def;p=linux

fuse: readdir: check for slash in names

commit efeb9e60d48f7778fdcad4a0f3ad9ea9b19e5dfd upstream.

Userspace can add names containing a slash character to the directory
listing.  Don't allow this as it could cause all sorts of trouble.

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
[bwh: Backported to 3.2: drop changes to parse_dirplusfile() which we
 don't have]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---

diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c
index 2747103f76ed..06e2f73e64a8 100644
--- a/fs/fuse/dir.c
+++ b/fs/fuse/dir.c
@@ -1063,6 +1063,8 @@ static int parse_dirfile(char *buf, size_t nbytes, struct file *file,
 			return -EIO;
 		if (reclen > nbytes)
 			break;
+		if (memchr(dirent->name, '/', dirent->namelen) != NULL)
+			return -EIO;
 
 		over = filldir(dstbuf, dirent->name, dirent->namelen,
 			       file->f_pos, dirent->ino, dirent->type);