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

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Message-ID: <20081211223608.GE18665@dastardly.home.dghda.com>
Date:	Thu, 11 Dec 2008 22:36:08 +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>, dushistov@...l.ru
Subject: [PATCH, v2] ufs: 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/ufs/inode.c b/fs/ufs/inode.c
index 39f8778..a22f64d 100644
--- a/fs/ufs/inode.c
+++ b/fs/ufs/inode.c
@@ -606,9 +606,11 @@ static void ufs_set_inode_ops(struct inode *inode)
 		inode->i_fop = &ufs_dir_operations;
 		inode->i_mapping->a_ops = &ufs_aops;
 	} else if (S_ISLNK(inode->i_mode)) {
-		if (!inode->i_blocks)
+		if (!inode->i_blocks) {
+			char *link = UFS_I(inode)->i_u1.i_symlink;
 			inode->i_op = &ufs_fast_symlink_inode_operations;
-		else {
+			link[inode->i_size] = '\0';
+		} else {
 			inode->i_op = &page_symlink_inode_operations;
 			inode->i_mapping->a_ops = &ufs_aops;
 		}
-- 
"I never could learn to drink that blood and call it wine" - Bob Dylan
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