ecryptfs: add missing lock around notify_change

Callers of notify_change() need to hold i_mutex.

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Cc: Michael Halcrow <mhalcrow@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/fs/ecryptfs/inode.c b/fs/ecryptfs/inode.c
index a7d5d7d2b2a7..1623ebf25e51 100644
--- a/fs/ecryptfs/inode.c
+++ b/fs/ecryptfs/inode.c
@@ -908,7 +908,9 @@ static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia)
         if (ia->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
                 ia->ia_valid &= ~ATTR_MODE;
 
+        mutex_lock(&lower_dentry->d_inode->i_mutex);
         rc = notify_change(lower_dentry, ia);
+        mutex_unlock(&lower_dentry->d_inode->i_mutex);
 out:
         fsstack_copy_attr_all(inode, lower_inode, NULL);
         return rc;