diff options
| author | Duane Griffin <duaneg@dghda.com> | 2008-12-19 20:47:10 +0000 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2008-12-31 18:07:38 -0500 |
| commit | a17d5232de7b53d34229de79ec22f4bb04adb7e4 (patch) | |
| tree | d42a96bf5e0806e4a67404709a8fdf0ed4e551c0 /fs/ecryptfs | |
| parent | 5cc4a0341a1295ea56b2e62eb70d96d8fdb94ded (diff) | |
| download | lwn-a17d5232de7b53d34229de79ec22f4bb04adb7e4.tar.gz lwn-a17d5232de7b53d34229de79ec22f4bb04adb7e4.zip | |
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>
Diffstat (limited to 'fs/ecryptfs')
| -rw-r--r-- | 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 89209f00f9c7..5e78fc179886 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; |