linux-kernel - [PATCH 5.12 245/677] NFSv4.2: fix copy stateid copying for the async copy

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Message-Id: <20210512144845.374536443@linuxfoundation.org>
Date:   Wed, 12 May 2021 16:44:51 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Dan Carpenter <dan.carpenter@...cle.com>,
        Olga Kornievskaia <kolga@...app.com>,
        Chuck Lever <chuck.lever@...cle.com>,
        Dai Ngo <dai.ngo@...cle.com>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.12 245/677] NFSv4.2: fix copy stateid copying for the async copy

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

[ Upstream commit e739b12042b6b079a397a3c234f96c09d1de0b40 ]

This patch fixes Dan Carpenter's report that the static checker
found a problem where memcpy() was copying into too small of a buffer.

Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
Fixes: e0639dc5805a ("NFSD introduce async copy feature")
Signed-off-by: Olga Kornievskaia <kolga@...app.com>
Signed-off-by: Chuck Lever <chuck.lever@...cle.com>
Reviewed-by: Dai Ngo <dai.ngo@...cle.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/nfsd/nfs4proc.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index dd9f38d072dd..e13c4c81fb89 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -1538,8 +1538,8 @@ nfsd4_copy(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 		if (!nfs4_init_copy_state(nn, copy))
 			goto out_err;
 		refcount_set(&async_copy->refcount, 1);
-		memcpy(&copy->cp_res.cb_stateid, &copy->cp_stateid,
-			sizeof(copy->cp_stateid));
+		memcpy(&copy->cp_res.cb_stateid, &copy->cp_stateid.stid,
+			sizeof(copy->cp_res.cb_stateid));
 		dup_copy_fields(copy, async_copy);
 		async_copy->copy_task = kthread_create(nfsd4_do_async_copy,
 				async_copy, "%s", "copy thread");
-- 
2.30.2