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From:   Sasha Levin <Alexander.Levin@microsoft.com>
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        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
CC:     "Gustavo A. R. Silva" <gustavo@embeddedor.com>,
        "David S . Miller" <davem@davemloft.net>,
        Sasha Levin <Alexander.Levin@microsoft.com>
Subject: [PATCH AUTOSEL for 4.9 252/293] tcp_nv: fix potential integer
 overflow in tcpnv_acked
Thread-Topic: [PATCH AUTOSEL for 4.9 252/293] tcp_nv: fix potential integer
 overflow in tcpnv_acked
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Date:   Mon, 9 Apr 2018 00:26:08 +0000
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From: "Gustavo A. R. Silva" <gustavo@embeddedor.com>

[ Upstream commit e4823fbd229bfbba368b40cdadb8f4eeb20604cc ]

Add suffix ULL to constant 80000 in order to avoid a potential integer
overflow and give the compiler complete information about the proper
arithmetic to use. Notice that this constant is used in a context that
expects an expression of type u64.

The current cast to u64 effectively applies to the whole expression
as an argument of type u64 to be passed to div64_u64, but it does
not prevent it from being evaluated using 32-bit arithmetic instead
of 64-bit arithmetic.

Also, once the expression is properly evaluated using 64-bit arithmentic,
there is no need for the parentheses and the external cast to u64.

Addresses-Coverity-ID: 1357588 ("Unintentional integer overflow")
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
---
 net/ipv4/tcp_nv.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/ipv4/tcp_nv.c b/net/ipv4/tcp_nv.c
index e45e2c41c7bd..37a3cb999859 100644
--- a/net/ipv4/tcp_nv.c
+++ b/net/ipv4/tcp_nv.c
@@ -338,7 +338,7 @@ static void tcpnv_acked(struct sock *sk, const struct a=
ck_sample *sample)
 		 */
 		cwnd_by_slope =3D (u32)
 			div64_u64(((u64)ca->nv_rtt_max_rate) * ca->nv_min_rtt,
-				  (u64)(80000 * tp->mss_cache));
+				  80000ULL * tp->mss_cache);
 		max_win =3D cwnd_by_slope + nv_pad;
=20
 		/* If cwnd > max_win, decrease cwnd
--=20
2.15.1