netdev - [PATCH][next] seg6: fix unintentional integer overflow on left shift

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Message-Id: <20201207144503.169679-1-colin.king@canonical.com>
Date:   Mon,  7 Dec 2020 14:45:03 +0000
From:   Colin King <colin.king@...onical.com>
To:     "David S . Miller" <davem@...emloft.net>,
        Alexey Kuznetsov <kuznet@....inr.ac.ru>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        Jakub Kicinski <kuba@...nel.org>,
        Andrea Mayer <andrea.mayer@...roma2.it>, netdev@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH][next] seg6: fix unintentional integer overflow on left shift

From: Colin Ian King <colin.king@...onical.com>

Shifting the integer value 1 is evaluated using 32-bit arithmetic
and then used in an expression that expects a unsigned long value
leads to a potential integer overflow. Fix this by using the BIT
macro to perform the shift to avoid the overflow.

Addresses-Coverity: ("Uninitentional integer overflow")
Fixes: 964adce526a4 ("seg6: improve management of behavior attributes")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 net/ipv6/seg6_local.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/ipv6/seg6_local.c b/net/ipv6/seg6_local.c
index b07f7c1c82a4..d68de8cd1207 100644
--- a/net/ipv6/seg6_local.c
+++ b/net/ipv6/seg6_local.c
@@ -1366,7 +1366,7 @@ static void __destroy_attrs(unsigned long parsed_attrs, int max_parsed,
 	 * attribute; otherwise, we call the destroy() callback.
 	 */
 	for (i = 0; i < max_parsed; ++i) {
-		if (!(parsed_attrs & (1 << i)))
+		if (!(parsed_attrs & BIT(i)))
 			continue;
 
 		param = &seg6_action_params[i];
-- 
2.29.2