linux-kernel - [PATCH, v5] ext4: ensure fast symlinks are NUL-terminated

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Message-Id: <1229719638-6982-8-git-send-email-duaneg@dghda.com>
Date:	Fri, 19 Dec 2008 20:47:15 +0000
From:	"Duane Griffin" <duaneg@...da.com>
To:	linux-kernel@...r.kernel.org
Cc:	linux-fsdevel@...r.kernel.org, Al Viro <viro@...iv.linux.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Duane Griffin <duaneg@...da.com>,
	Theodore Ts'o <tytso@....edu>, adilger@....com,
	linux-ext4@...r.kernel.org
Subject: [PATCH, v5] ext4: ensure fast symlinks are NUL-terminated

Ensure fast symlink targets are NUL-terminated, even if corrupted
on-disk.

Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Theodore Ts'o <tytso@....edu>
Cc: adilger@....com
Cc: linux-ext4@...r.kernel.org
Signed-off-by: Duane Griffin <duaneg@...da.com>
---

Changes from v4: fixed off-by-one bug in maximum length, as pointed out by
Andreas Dilger.

 fs/ext4/inode.c |    7 +++++--
 1 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index ca88060..f940859 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -34,6 +34,7 @@
 #include <linux/writeback.h>
 #include <linux/pagevec.h>
 #include <linux/mpage.h>
+#include <linux/namei.h>
 #include <linux/uio.h>
 #include <linux/bio.h>
 #include "ext4_jbd2.h"
@@ -4200,9 +4201,11 @@ struct inode *ext4_iget(struct super_block *sb, unsigned long ino)
 		inode->i_op = &ext4_dir_inode_operations;
 		inode->i_fop = &ext4_dir_operations;
 	} else if (S_ISLNK(inode->i_mode)) {
-		if (ext4_inode_is_fast_symlink(inode))
+		if (ext4_inode_is_fast_symlink(inode)) {
 			inode->i_op = &ext4_fast_symlink_inode_operations;
-		else {
+			nd_terminate_link(ei->i_data, inode->i_size,
+				sizeof(ei->i_data) - 1);
+		} else {
 			inode->i_op = &ext4_symlink_inode_operations;
 			ext4_set_aops(inode);
 		}
-- 
1.6.0.4

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