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ceph: add additional size check in ceph_setattr()

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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 <[email protected]>
Reviewed-by: "Yan, Zheng" <[email protected]>
Signed-off-by: Ilya Dryomov <[email protected]>
This commit is contained in:
Chengguang Xu 2018-08-05 19:33:01 +08:00 • committed by Ilya Dryomov
commit 36a4c72d1c
1 changed files with 5 additions and 0 deletions
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5
fs/ceph/inode.c
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@ -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)
@ -2166,6 +2167,10 @@ int ceph_setattr(struct dentry *dentry, struct iattr *attr)
if (err != 0)
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;