tree 627e0fbcf8b2d1872311c4a6256cb55170471f94
parent a9e53869cb43c96d6d851c491fd4e26430ab6ba6
author Dai Ngo <dai.ngo@oracle.com> 1670885411 -0800
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1680173281 +0200

NFSD: fix use-after-free in __nfs42_ssc_open()

commit 75333d48f92256a0dec91dbf07835e804fc411c0 upstream.

Problem caused by source's vfsmount being unmounted but remains
on the delayed unmount list. This happens when nfs42_ssc_open()
return errors.

Fixed by removing nfsd4_interssc_connect(), leave the vfsmount
for the laundromat to unmount when idle time expires.

We don't need to call nfs_do_sb_deactive when nfs42_ssc_open
return errors since the file was not opened so nfs_server->active
was not incremented. Same as in nfsd4_copy, if we fail to
launch nfsd4_do_async_copy thread then there's no need to
call nfs_do_sb_deactive

Reported-by: Xingyuan Mo <hdthky0@gmail.com>
Signed-off-by: Dai Ngo <dai.ngo@oracle.com>
Tested-by: Xingyuan Mo <hdthky0@gmail.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Ovidiu Panait <ovidiu.panait@windriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>