linux-kernel - [RFC PATCH 4/6] hv_sock: Initialize send_buf in hvs_stream

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Date:   Wed, 13 Apr 2022 22:47:40 +0200
From:   "Andrea Parri (Microsoft)" <parri.andrea@...il.com>
To:     KY Srinivasan <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Wei Liu <wei.liu@...nel.org>, Dexuan Cui <decui@...rosoft.com>,
        Michael Kelley <mikelley@...rosoft.com>,
        Stefano Garzarella <sgarzare@...hat.com>,
        David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Cc:     linux-hyperv@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        "Andrea Parri (Microsoft)" <parri.andrea@...il.com>
Subject: [RFC PATCH 4/6] hv_sock: Initialize send_buf in hvs_stream_enqueue()

So that padding or uninitialized bytes can't leak guest memory contents.

Signed-off-by: Andrea Parri (Microsoft) <parri.andrea@...il.com>
---
 net/vmw_vsock/hyperv_transport.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/vmw_vsock/hyperv_transport.c b/net/vmw_vsock/hyperv_transport.c
index 092cadc2c866d..72ce00928c8e7 100644
--- a/net/vmw_vsock/hyperv_transport.c
+++ b/net/vmw_vsock/hyperv_transport.c
@@ -655,7 +655,7 @@ static ssize_t hvs_stream_enqueue(struct vsock_sock *vsk, struct msghdr *msg,
 
 	BUILD_BUG_ON(sizeof(*send_buf) != HV_HYP_PAGE_SIZE);
 
-	send_buf = kmalloc(sizeof(*send_buf), GFP_KERNEL);
+	send_buf = kzalloc(sizeof(*send_buf), GFP_KERNEL);
 	if (!send_buf)
 		return -ENOMEM;
 
-- 
2.25.1