From: Michael Halcrow Date: Thu, 19 Jul 2007 08:47:54 +0000 (-0700) Subject: eCryptfs: ecryptfs_setattr() bugfix X-Git-Tag: v2.6.23-rc1~440 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=64ee4808a786caade50362d5057f65314fdf2f36;p=linux-2.6 eCryptfs: ecryptfs_setattr() bugfix There is another bug recently introduced into the ecryptfs_setattr() function in 2.6.22. eCryptfs will attempt to treat special files like regular eCryptfs files on chmod, chown, and so forth. This leads to a NULL pointer dereference. This patch validates that the file is a regular file before proceeding with operations related to the inode's crypt_stat. Thanks to Ryusuke Konishi for finding this bug and suggesting the fix. Signed-off-by: Michael Halcrow Cc: Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/fs/ecryptfs/inode.c b/fs/ecryptfs/inode.c index e77a2ec71a..0a50942b43 100644 --- a/fs/ecryptfs/inode.c +++ b/fs/ecryptfs/inode.c @@ -902,8 +902,9 @@ static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia) mutex_lock(&crypt_stat->cs_mutex); if (S_ISDIR(dentry->d_inode->i_mode)) crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); - else if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED) - || !(crypt_stat->flags & ECRYPTFS_KEY_VALID)) { + else if (S_ISREG(dentry->d_inode->i_mode) + && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED) + || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) { struct vfsmount *lower_mnt; struct file *lower_file = NULL; struct ecryptfs_mount_crypt_stat *mount_crypt_stat;