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

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Date:	Thu, 11 Dec 2008 22:35:32 +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] sysv: 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/sysv/inode.c b/fs/sysv/inode.c
index df0d435..1511228 100644
--- a/fs/sysv/inode.c
+++ b/fs/sysv/inode.c
@@ -163,8 +163,10 @@ void sysv_set_inode(struct inode *inode, dev_t rdev)
 		if (inode->i_blocks) {
 			inode->i_op = &sysv_symlink_inode_operations;
 			inode->i_mapping->a_ops = &sysv_aops;
-		} else
+		} else {
 			inode->i_op = &sysv_fast_symlink_inode_operations;
+			((char *) SYSV_I(inode)->i_data)[inode->i_size] = '\0';
+		}
 	} else
 		init_special_inode(inode, inode->i_mode, rdev);
 }
-- 
"I never could learn to drink that blood and call it wine" - Bob Dylan
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