linux-kernel - [PATCH 5.10 129/171] SUNRPC: svc_tcp_sendmsg() should handle errors from xdr_alloc

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Date:   Tue, 12 Apr 2022 08:30:20 +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,
        Trond Myklebust <trond.myklebust@...merspace.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.10 129/171] SUNRPC: svc_tcp_sendmsg() should handle errors from xdr_alloc_bvec()

From: Trond Myklebust <trond.myklebust@...merspace.com>

[ Upstream commit b056fa070814897be32d83b079dbc311375588e7 ]

The allocation is done with GFP_KERNEL, but it could still fail in a low
memory situation.

Fixes: 4a85a6a3320b ("SUNRPC: Handle TCP socket sends with kernel_sendpage() again")
Signed-off-by: Trond Myklebust <trond.myklebust@...merspace.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 net/sunrpc/svcsock.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/net/sunrpc/svcsock.c b/net/sunrpc/svcsock.c
index eba1714bf09a..6d5bb8bfed38 100644
--- a/net/sunrpc/svcsock.c
+++ b/net/sunrpc/svcsock.c
@@ -1091,7 +1091,9 @@ static int svc_tcp_sendmsg(struct socket *sock, struct msghdr *msg,
 	int flags, ret;
 
 	*sentp = 0;
-	xdr_alloc_bvec(xdr, GFP_KERNEL);
+	ret = xdr_alloc_bvec(xdr, GFP_KERNEL);
+	if (ret < 0)
+		return ret;
 
 	msg->msg_flags = MSG_MORE;
 	ret = kernel_sendmsg(sock, msg, &rm, 1, rm.iov_len);
-- 
2.35.1