linux-kernel - [PATCH 5.15 054/244] SUNRPC: Fix xdr_encode

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Message-Id: <20220823080100.868709019@linuxfoundation.org>
Date:   Tue, 23 Aug 2022 10:23:33 +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, Chuck Lever <chuck.lever@...cle.com>,
        Jeff Layton <jlayton@...nel.org>
Subject: [PATCH 5.15 054/244] SUNRPC: Fix xdr_encode_bool()

From: Chuck Lever <chuck.lever@...cle.com>

commit c770f31d8f580ed4b965c64f924ec1cc50e41734 upstream.

I discovered that xdr_encode_bool() was returning the same address
that was passed in the @p parameter. The documenting comment states
that the intent is to return the address of the next buffer
location, just like the other "xdr_encode_*" helpers.

The result was the encoded results of NFSv3 PATHCONF operations were
not formed correctly.

Fixes: ded04a587f6c ("NFSD: Update the NFSv3 PATHCONF3res encoder to use struct xdr_stream")
Signed-off-by: Chuck Lever <chuck.lever@...cle.com>
Reviewed-by: Jeff Layton <jlayton@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 include/linux/sunrpc/xdr.h |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/include/linux/sunrpc/xdr.h
+++ b/include/linux/sunrpc/xdr.h
@@ -405,8 +405,8 @@ static inline int xdr_stream_encode_item
  */
 static inline __be32 *xdr_encode_bool(__be32 *p, u32 n)
 {
-	*p = n ? xdr_one : xdr_zero;
-	return p++;
+	*p++ = n ? xdr_one : xdr_zero;
+	return p;
 }
 
 /**