ceph: add additional size check in ceph_setattr()

ceph_setattr() finally calls vfs function inode_newsize_ok()
to do offset validation and that is based on sb->s_maxbytes.
Because we set sb->s_maxbytes to MAX_LFS_FILESIZE to through
VFS check and do proper offset validation in cephfs level,
we need adding proper offset validation before calling
inode_newsize_ok().

Signed-off-by: Chengguang Xu <cgxu519@gmx.com>
Reviewed-by: "Yan, Zheng" <zyan@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/fs/ceph/inode.c b/fs/ceph/inode.c
index d62f65f2875d..ebc7bdaed2d0 100644
--- a/fs/ceph/inode.c
+++ b/fs/ceph/inode.c
@@ -2157,6 +2157,7 @@ int __ceph_setattr(struct inode *inode, struct iattr *attr)
 int ceph_setattr(struct dentry *dentry, struct iattr *attr)
 {
         struct inode *inode = d_inode(dentry);
+        struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
         int err;
 
         if (ceph_snap(inode) != CEPH_NOSNAP)
@@ -2167,6 +2168,10 @@ int ceph_setattr(struct dentry *dentry, struct iattr *attr)
                 return err;
 
         if ((attr->ia_valid & ATTR_SIZE) &&
+            attr->ia_size > max(inode->i_size, fsc->max_file_size))
+                return -EFBIG;
+
+        if ((attr->ia_valid & ATTR_SIZE) &&
             ceph_quota_is_max_bytes_exceeded(inode, attr->ia_size))
                 return -EDQUOT;