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A fix for a kernel stack overflow bug in ceph setattr code, marked for

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stable.
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Merge tag 'ceph-for-4.11-rc9' of git://github.com/ceph/ceph-client

Pull ceph fix from Ilya Dryomov:
 "A fix for a kernel stack overflow bug in ceph setattr code, marked for
  stable"

* tag 'ceph-for-4.11-rc9' of git://github.com/ceph/ceph-client:
  ceph: fix recursion between ceph_set_acl() and __ceph_setattr()
This commit is contained in:
Linus Torvalds 2017-04-27 11:38:05 -07:00
commit 19ac447420
1 changed files with 10 additions and 12 deletions
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22
fs/ceph/inode.c
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@ -2071,11 +2071,6 @@ int __ceph_setattr(struct inode *inode, struct iattr *attr)
if (inode_dirty_flags)
__mark_inode_dirty(inode, inode_dirty_flags);
if (ia_valid & ATTR_MODE) {
err = posix_acl_chmod(inode, attr->ia_mode);
if (err)
goto out_put;
}
if (mask) {
req->r_inode = inode;
@ -2089,13 +2084,11 @@ int __ceph_setattr(struct inode *inode, struct iattr *attr)
ceph_cap_string(dirtied), mask);
ceph_mdsc_put_request(req);
if (mask & CEPH_SETATTR_SIZE)
ceph_free_cap_flush(prealloc_cf);
if (err >= 0 && (mask & CEPH_SETATTR_SIZE))
__ceph_do_pending_vmtruncate(inode);
ceph_free_cap_flush(prealloc_cf);
return err;
out_put:
ceph_mdsc_put_request(req);
ceph_free_cap_flush(prealloc_cf);
return err;
}
@ -2114,7 +2107,12 @@ int ceph_setattr(struct dentry *dentry, struct iattr *attr)
if (err != 0)
return err;
return __ceph_setattr(inode, attr);
err = __ceph_setattr(inode, attr);
if (err >= 0 && (attr->ia_valid & ATTR_MODE))
err = posix_acl_chmod(inode, attr->ia_mode);
return err;
}
/*