From: Colin King <colin.king@canonical.com>
To: "David S . Miller" <davem@davemloft.net>,
Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>,
Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>,
Jakub Kicinski <kuba@kernel.org>,
Andrea Mayer <andrea.mayer@uniroma2.it>,
netdev@vger.kernel.org
Cc: kernel-janitors@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH][next] seg6: fix unintentional integer overflow on left shift
Date: Mon, 7 Dec 2020 14:45:03 +0000 [thread overview]
Message-ID: <20201207144503.169679-1-colin.king@canonical.com> (raw)
From: Colin Ian King <colin.king@canonical.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@canonical.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
next reply other threads:[~2020-12-07 14:46 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-07 14:45 Colin King [this message]
2020-12-07 19:59 ` [PATCH][next] seg6: fix unintentional integer overflow on left shift Andrea Mayer
2020-12-07 20:44 ` Colin Ian King
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