linux-kernel - [PATCH 5.4 177/203] NFSD fixing possible null pointer derefering in copy offload

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Message-Id: <20200116231759.922172938@linuxfoundation.org>
Date:   Fri, 17 Jan 2020 00:18:14 +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, Dan Carpenter <dan.carpenter@...cle.com>,
        Olga Kornievskaia <kolga@...app.com>,
        "J. Bruce Fields" <bfields@...hat.com>
Subject: [PATCH 5.4 177/203] NFSD fixing possible null pointer derefering in copy offload

From: Olga Kornievskaia <olga.kornievskaia@...il.com>

commit 18f428d4e2f7eff162d80b2b21689496c4e82afd upstream.

Static checker revealed possible error path leading to possible
NULL pointer dereferencing.

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: J. Bruce Fields <bfields@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/nfsd/nfs4proc.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -1298,7 +1298,8 @@ nfsd4_copy(struct svc_rqst *rqstp, struc
 out:
 	return status;
 out_err:
-	cleanup_async_copy(async_copy);
+	if (async_copy)
+		cleanup_async_copy(async_copy);
 	goto out;
 }