linux-kernel - [PATCH, v2 3/4] ufs: ensure fast symlinks are NUL-terminated

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Message-Id: <1231454631-14329-3-git-send-email-duaneg@dghda.com>
Date:	Thu,  8 Jan 2009 22:43:50 +0000
From:	"Duane Griffin" <duaneg@...da.com>
To:	Evgeniy Dushistov <dushistov@...l.ru>
Cc:	Al Viro <viro@...iv.linux.org.uk>, linux-kernel@...r.kernel.org,
	Duane Griffin <duaneg@...da.com>
Subject: [PATCH, v2 3/4] ufs: ensure fast symlinks are NUL-terminated

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

Signed-off-by: Duane Griffin <duaneg@...da.com>
---

checkpatch complains about the lines being over 80 characters, but IMO it is
more readable this way. Let me know if you'd prefer it split it over two
lines, though.

Version 1 -> 2:
  * No change

 fs/ufs/inode.c |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/fs/ufs/inode.c b/fs/ufs/inode.c
index ac8b324..3d2512c 100644
--- a/fs/ufs/inode.c
+++ b/fs/ufs/inode.c
@@ -658,7 +658,8 @@ static int ufs1_read_inode(struct inode *inode, struct ufs_inode *ufs_inode)
 		       sizeof(ufs_inode->ui_u2.ui_addr));
 	} else {
 		memcpy(ufsi->i_u1.i_symlink, ufs_inode->ui_u2.ui_symlink,
-		       sizeof(ufs_inode->ui_u2.ui_symlink));
+		       sizeof(ufs_inode->ui_u2.ui_symlink) - 1);
+		ufsi->i_u1.i_symlink[sizeof(ufs_inode->ui_u2.ui_symlink) - 1] = 0;
 	}
 	return 0;
 }
@@ -706,7 +707,8 @@ static int ufs2_read_inode(struct inode *inode, struct ufs2_inode *ufs2_inode)
 		       sizeof(ufs2_inode->ui_u2.ui_addr));
 	} else {
 		memcpy(ufsi->i_u1.i_symlink, ufs2_inode->ui_u2.ui_symlink,
-		       sizeof(ufs2_inode->ui_u2.ui_symlink));
+		       sizeof(ufs2_inode->ui_u2.ui_symlink) - 1);
+		ufsi->i_u1.i_symlink[sizeof(ufs2_inode->ui_u2.ui_symlink) - 1] = 0;
 	}
 	return 0;
 }
-- 
1.6.0.6

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