From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
To: "David S. Miller" <davem@davemloft.net>, netdev@vger.kernel.org
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Subject: [PATCH v1] net: dev: Use unsigned integer as an argument to left-shift
Date: Wed, 27 Feb 2019 13:37:26 +0300 [thread overview]
Message-ID: <20190227103726.15163-1-andriy.shevchenko@linux.intel.com> (raw)
1 << 31 is Undefined Behaviour according to the C standard.
Use U type modifier to avoid theoretical overflow.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
include/linux/netdevice.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 86dbb3e29139..848b54b7ec91 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -3861,7 +3861,7 @@ static inline u32 netif_msg_init(int debug_value, int default_msg_enable_bits)
if (debug_value == 0) /* no output */
return 0;
/* set low N bits */
- return (1 << debug_value) - 1;
+ return (1U << debug_value) - 1;
}
static inline void __netif_tx_lock(struct netdev_queue *txq, int cpu)
--
2.20.1
next reply other threads:[~2019-02-27 10:37 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-27 10:37 Andy Shevchenko [this message]
2019-02-27 17:34 ` [PATCH v1] net: dev: Use unsigned integer as an argument to left-shift David Miller
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20190227103726.15163-1-andriy.shevchenko@linux.intel.com \
--to=andriy.shevchenko@linux.intel.com \
--cc=davem@davemloft.net \
--cc=netdev@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).