linux-kernel - [PATCH net-next 2/2] rxrpc: Fix error check on ->alloc

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Date: Tue, 12 Mar 2024 23:37:18 +0000
From: David Howells <dhowells@...hat.com>
To: netdev@...r.kernel.org
Cc: David Howells <dhowells@...hat.com>,
	Marc Dionne <marc.dionne@...istor.com>,
	Yunsheng Lin <linyunsheng@...wei.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	linux-afs@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH net-next 2/2] rxrpc: Fix error check on ->alloc_txbuf()

rxrpc_alloc_*_txbuf() and ->alloc_txbuf() return NULL to indicate no
memory, but rxrpc_send_data() uses IS_ERR().

Fix rxrpc_send_data() to check for NULL only and set -ENOMEM if it sees
that.

Fixes: 49489bb03a50 ("rxrpc: Do zerocopy using MSG_SPLICE_PAGES and page frags")
Signed-off-by: David Howells <dhowells@...hat.com>
Reported-by: Marc Dionne <marc.dionne@...istor.com>
cc: "David S. Miller" <davem@...emloft.net>
cc: Eric Dumazet <edumazet@...gle.com>
cc: Jakub Kicinski <kuba@...nel.org>
cc: Paolo Abeni <pabeni@...hat.com>
cc: linux-afs@...ts.infradead.org
cc: netdev@...r.kernel.org
---
 net/rxrpc/sendmsg.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/rxrpc/sendmsg.c b/net/rxrpc/sendmsg.c
index 6f765768c49c..894b8fa68e5e 100644
--- a/net/rxrpc/sendmsg.c
+++ b/net/rxrpc/sendmsg.c
@@ -349,8 +349,8 @@ static int rxrpc_send_data(struct rxrpc_sock *rx,
 			 */
 			remain = more ? INT_MAX : msg_data_left(msg);
 			txb = call->conn->security->alloc_txbuf(call, remain, sk->sk_allocation);
-			if (IS_ERR(txb)) {
-				ret = PTR_ERR(txb);
+			if (!txb) {
+				ret = -ENOMEM;
 				goto maybe_error;
 			}
 		}