netdev - [PATCH 1/2] sunrpc: account for TCP record marker in rq

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Message-Id: <20251008-rq_bvec-v1-1-7f23d32d75e5@kernel.org>
Date: Wed, 08 Oct 2025 14:58:52 -0400
From: Jeff Layton <jlayton@...nel.org>
To: Chuck Lever <chuck.lever@...cle.com>, NeilBrown <neil@...wn.name>, 
 Olga Kornievskaia <okorniev@...hat.com>, Dai Ngo <Dai.Ngo@...cle.com>, 
 Tom Talpey <tom@...pey.com>, Trond Myklebust <trondmy@...nel.org>, 
 Anna Schumaker <anna@...nel.org>, "David S. Miller" <davem@...emloft.net>, 
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, 
 Paolo Abeni <pabeni@...hat.com>, Simon Horman <horms@...nel.org>, 
 David Howells <dhowells@...hat.com>
Cc: linux-nfs@...r.kernel.org, netdev@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Jeff Layton <jlayton@...nel.org>
Subject: [PATCH 1/2] sunrpc: account for TCP record marker in rq_bvec array
 when sending

The call to xdr_buf_to_bvec() in svc_tcp_sendto() passes in the second
slot to the bvec array as the starting slot, but doesn't decrease the
length of the array by one.

Fixes: 59cf7346542b ("sunrpc: Replace the rq_bvec array with dynamically-allocated memory")
Signed-off-by: Jeff Layton <jlayton@...nel.org>
---
 net/sunrpc/svcsock.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/sunrpc/svcsock.c b/net/sunrpc/svcsock.c
index 7b90abc5cf0ee1520796b2f38fcb977417009830..377fcaaaa061463fc5c85fc09c7a8eab5e06af77 100644
--- a/net/sunrpc/svcsock.c
+++ b/net/sunrpc/svcsock.c
@@ -1244,7 +1244,7 @@ static int svc_tcp_sendmsg(struct svc_sock *svsk, struct svc_rqst *rqstp,
 	memcpy(buf, &marker, sizeof(marker));
 	bvec_set_virt(rqstp->rq_bvec, buf, sizeof(marker));

-	count = xdr_buf_to_bvec(rqstp->rq_bvec + 1, rqstp->rq_maxpages,
+	count = xdr_buf_to_bvec(rqstp->rq_bvec + 1, rqstp->rq_maxpages - 1,
 				&rqstp->rq_res);

 	iov_iter_bvec(&msg.msg_iter, ITER_SOURCE, rqstp->rq_bvec,

-- 
2.51.0