linux-kernel - [PATCH 5.10 044/157] NFSD: fix dest to src mount in inter-server COPY

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Date:   Mon, 22 Mar 2021 13:26:41 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Olga Kornievskaia <kolga@...app.com>,
        Chuck Lever <chuck.lever@...cle.com>,
        Dai Ngo <dai.ngo@...cle.com>
Subject: [PATCH 5.10 044/157] NFSD: fix dest to src mount in inter-server COPY

From: Olga Kornievskaia <kolga@...app.com>

commit 614c9750173e412663728215152cc6d12bcb3425 upstream.

A cleanup of the inter SSC copy needs to call fput() of the source
file handle to make sure that file structure is freed as well as
drop the reference on the superblock to unmount the source server.

Fixes: 36e1e5ba90fb ("NFSD: Fix use-after-free warning when doing inter-server copy")
Signed-off-by: Olga Kornievskaia <kolga@...app.com>
Signed-off-by: Chuck Lever <chuck.lever@...cle.com>
Tested-by: Dai Ngo <dai.ngo@...cle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 fs/nfsd/nfs4proc.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -1299,7 +1299,7 @@ nfsd4_cleanup_inter_ssc(struct vfsmount
 			struct nfsd_file *dst)
 {
 	nfs42_ssc_close(src->nf_file);
-	/* 'src' is freed by nfsd4_do_async_copy */
+	fput(src->nf_file);
 	nfsd_file_put(dst);
 	mntput(ss_mnt);
 }