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authorTyler Hicks <tyhicks@linux.vnet.ibm.com>2009-04-23 01:27:12 +0400
committerTyler Hicks <tyhicks@linux.vnet.ibm.com>2009-04-23 01:27:12 +0400
commitca8e34f2b05a8289b47907b083dc01dd654ecbde (patch)
treeeeedcd559c8add0b8ebc87489f8daf78258d59a1 /fs/ecryptfs
parente77cc8d243f9f1e1d3f0799e23cc14e837ccc8c6 (diff)
downloadlinux-ca8e34f2b05a8289b47907b083dc01dd654ecbde.tar.xz
eCryptfs: Lock lower directory inode mutex during lookup
This patch locks the lower directory inode's i_mutex before calling lookup_one_len() to find the appropriate dentry in the lower filesystem. This bug was found thanks to the warning set in commit 2f9092e1. Signed-off-by: Tyler Hicks <tyhicks@linux.vnet.ibm.com>
Diffstat (limited to 'fs/ecryptfs')
-rw-r--r--fs/ecryptfs/inode.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/ecryptfs/inode.c b/fs/ecryptfs/inode.c
index 5ed86e25b8a2..d8325263ba6e 100644
--- a/fs/ecryptfs/inode.c
+++ b/fs/ecryptfs/inode.c
@@ -379,9 +379,11 @@ static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode,
goto out_d_drop;
}
lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent);
+ mutex_lock(&lower_dir_dentry->d_inode->i_mutex);
lower_dentry = lookup_one_len(ecryptfs_dentry->d_name.name,
lower_dir_dentry,
ecryptfs_dentry->d_name.len);
+ mutex_unlock(&lower_dir_dentry->d_inode->i_mutex);
if (IS_ERR(lower_dentry)) {
rc = PTR_ERR(lower_dentry);
printk(KERN_ERR "%s: lookup_one_len() returned [%d] on "
@@ -406,9 +408,11 @@ static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode,
"filename; rc = [%d]\n", __func__, rc);
goto out_d_drop;
}
+ mutex_lock(&lower_dir_dentry->d_inode->i_mutex);
lower_dentry = lookup_one_len(encrypted_and_encoded_name,
lower_dir_dentry,
encrypted_and_encoded_name_size - 1);
+ mutex_unlock(&lower_dir_dentry->d_inode->i_mutex);
if (IS_ERR(lower_dentry)) {
rc = PTR_ERR(lower_dentry);
printk(KERN_ERR "%s: lookup_one_len() returned [%d] on "