linux-kernel - [PATCH, v2] freevxfs: ensure link targets are NUL-terminated

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Message-ID: <20081211223733.GF18665@dastardly.home.dghda.com>
Date:	Thu, 11 Dec 2008 22:37:34 +0000
From:	"Duane Griffin" <duaneg@...da.com>
To:	Duane Griffin <duaneg@...da.com>
Cc:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	Boaz Harrosh <bharrosh@...asas.com>, hch@...radead.org
Subject: [PATCH, v2] freevxfs: ensure link targets are NUL-terminated

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

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

V2: terminate when the link is read instead of every time it is
followed, as suggested by Dave Kleikamp.

diff --git a/fs/freevxfs/vxfs_inode.c b/fs/freevxfs/vxfs_inode.c
index 9f3f2ce..03a6ea5 100644
--- a/fs/freevxfs/vxfs_inode.c
+++ b/fs/freevxfs/vxfs_inode.c
@@ -325,8 +325,10 @@ vxfs_iget(struct super_block *sbp, ino_t ino)
 		if (!VXFS_ISIMMED(vip)) {
 			ip->i_op = &page_symlink_inode_operations;
 			ip->i_mapping->a_ops = &vxfs_aops;
-		} else
+		} else {
 			ip->i_op = &vxfs_immed_symlink_iops;
+			vip->vii_immed.vi_immed[ip->i_size] = '\0';
+		}
 	} else
 		init_special_inode(ip, ip->i_mode, old_decode_dev(vip->vii_rdev));
 
-- 
"I never could learn to drink that blood and call it wine" - Bob Dylan
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