linux-kernel - [PATCH AUTOSEL 4.18 31/58] net/smc: fix sizeof to int comparison

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Date:   Mon,  8 Oct 2018 11:24:56 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     stable@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     YueHaibing <yuehaibing@...wei.com>,
        Ursula Braun <ubraun@...ux.ibm.com>,
        "David S . Miller" <davem@...emloft.net>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH AUTOSEL 4.18 31/58] net/smc: fix sizeof to int comparison

From: YueHaibing <yuehaibing@...wei.com>

[ Upstream commit 381897798a94065ffcad0772eecdc6b04a7ff23d ]

Comparing an int to a size, which is unsigned, causes the int to become
unsigned, giving the wrong result. kernel_sendmsg can return a negative
error code.

Signed-off-by: YueHaibing <yuehaibing@...wei.com>
Signed-off-by: Ursula Braun <ubraun@...ux.ibm.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
---
 net/smc/smc_clc.c | 14 ++++++--------
 1 file changed, 6 insertions(+), 8 deletions(-)

diff --git a/net/smc/smc_clc.c b/net/smc/smc_clc.c
index ae5d168653ce..086157555ac3 100644
--- a/net/smc/smc_clc.c
+++ b/net/smc/smc_clc.c
@@ -405,14 +405,12 @@ int smc_clc_send_proposal(struct smc_sock *smc,
 	vec[i++].iov_len = sizeof(trl);
 	/* due to the few bytes needed for clc-handshake this cannot block */
 	len = kernel_sendmsg(smc->clcsock, &msg, vec, i, plen);
-	if (len < sizeof(pclc)) {
-		if (len >= 0) {
-			reason_code = -ENETUNREACH;
-			smc->sk.sk_err = -reason_code;
-		} else {
-			smc->sk.sk_err = smc->clcsock->sk->sk_err;
-			reason_code = -smc->sk.sk_err;
-		}
+	if (len < 0) {
+		smc->sk.sk_err = smc->clcsock->sk->sk_err;
+		reason_code = -smc->sk.sk_err;
+	} else if (len < (int)sizeof(pclc)) {
+		reason_code = -ENETUNREACH;
+		smc->sk.sk_err = -reason_code;
 	}
 
 	return reason_code;
-- 
2.17.1