linux-kernel - [PATCH v2] rxrpc: sendmsg: Fix variable overwrite in rxrpc_queue

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Date:   Mon, 27 Nov 2017 15:41:27 -0600
From:   "Gustavo A. R. Silva" <garsilva@...eddedor.com>
To:     David Howells <dhowells@...hat.com>,
        "David S. Miller" <davem@...emloft.net>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        "Gustavo A. R. Silva" <garsilva@...eddedor.com>
Subject: [PATCH v2] rxrpc: sendmsg: Fix variable overwrite in
 rxrpc_queue_packet

Value assigned to variable resend_at is overwritten before it can be used.

The correct fix here is to add _now_ to the previously computed value in
resend_at.

Addresses-Coverity-ID: 1462262
Fixes: beb8e5e4f38c ("rxrpc: Express protocol timeouts in terms of RTT")
Link: https://marc.info/?i=17004.1511808959%40warthog.procyon.org.uk
Signed-off-by: Gustavo A. R. Silva <garsilva@...eddedor.com>
---
Changes in v2:
 Update value in resend_at instead of removing the code.

 net/rxrpc/sendmsg.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/rxrpc/sendmsg.c b/net/rxrpc/sendmsg.c
index a1c53ac..09f2a3e 100644
--- a/net/rxrpc/sendmsg.c
+++ b/net/rxrpc/sendmsg.c
@@ -233,7 +233,7 @@ static void rxrpc_queue_packet(struct rxrpc_sock *rx, struct rxrpc_call *call,
 		if (resend_at < 1)
 			resend_at = 1;
 
-		resend_at = now + rxrpc_resend_timeout;
+		resend_at += now;
 		WRITE_ONCE(call->resend_at, resend_at);
 		rxrpc_reduce_call_timer(call, resend_at, now,
 					rxrpc_timer_set_for_send);
-- 
2.7.4