Gitweb: http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=a17d52...
Commit: a17d5232de7b53d34229de79ec22f4bb04adb7e4
Parent: 5cc4a0341a1295ea56b2e62eb70d96d8fdb94ded
Author: Duane Griffin <duaneg@dghda.com>
AuthorDate: Fri Dec 19 20:47:10 2008 +0000
Committer: Al Viro <viro@zeniv.linux.org.uk>
CommitDate: Wed Dec 31 18:07:38 2008 -0500
eCryptfs: check readlink result was not an error before using it
The result from readlink is being used to index into the link name
buffer without checking whether it is a valid length. If readlink
returns an error this will fault or cause memory corruption.
Cc: Tyler Hicks <tyhicks@linux.vnet.ibm.com>
Cc: Dustin Kirkland <kirkland@canonical.com>
Cc: ecryptfs-devel@lists.launchpad.net
Signed-off-by: Duane Griffin <duaneg@dghda.com>
Acked-by: Michael Halcrow <mhalcrow@us.ibm.com>
Acked-by: Tyler Hicks <tyhicks@linux.vnet.ibm.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
fs/ecryptfs/inode.c | 3 ++-
1 files changed, 2 insertions(+), 1 deletions(-)
diff --git a/fs/ecryptfs/inode.c b/fs/ecryptfs/inode.c
index 89209f0..5e78fc1 100644
--- a/fs/ecryptfs/inode.c
+++ b/fs/ecryptfs/inode.c
@@ -673,10 +673,11 @@ static void *ecryptfs_follow_link(struct dentry *dentry, struct nameidata *nd)
ecryptfs_printk(KERN_DEBUG, "Calling readlink w/ "
"dentry->d_name.name = [%s]\n", dentry->d_name.name);
rc = dentry->d_inode->i_op->readlink(dentry, (char __user *)buf, len);
- buf[rc] = '\0';
set_fs(old_fs);
if (rc < 0)
goto out_free;
+ else
+ buf[rc] = '\0';
rc = 0;
nd_set_link(nd, buf);
goto out;
--
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