linux-kernel - [tip:x86/urgent] x86/apic/uv: Silence a shift wrapping warning

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Wed, 23 Nov 2016 22:25:48 -0800
From:   tip-bot for Dan Carpenter <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, travis@....com, nzimmer@....com,
        mingo@...nel.org, dan.carpenter@...cle.com, sivanich@....com,
        tglx@...utronix.de, torvalds@...ux-foundation.org,
        peterz@...radead.org, bigeasy@...utronix.de, athorlton@....com,
        hpa@...or.com
Subject: [tip:x86/urgent] x86/apic/uv: Silence a shift wrapping warning

Commit-ID:  c4597fd756836a5fb7900f2091797ab564390ad0
Gitweb:     http://git.kernel.org/tip/c4597fd756836a5fb7900f2091797ab564390ad0
Author:     Dan Carpenter <dan.carpenter@...cle.com>
AuthorDate: Thu, 24 Nov 2016 01:19:08 +0300
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Thu, 24 Nov 2016 06:01:05 +0100

x86/apic/uv: Silence a shift wrapping warning

'm_io' is stored in 6 bits so it's a number in the 0-63 range.  Static
analysis tools complain that 1 << 63 will wrap so I have changed it to
1ULL << m_io.

This code is over three years old so presumably the bug doesn't happen
very frequently in real life or someone would have complained by now.

Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Cc: Alex Thorlton <athorlton@....com>
Cc: Dimitri Sivanich <sivanich@....com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Mike Travis <travis@....com>
Cc: Nathan Zimmer <nzimmer@....com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: kernel-janitors@...r.kernel.org
Fixes: b15cc4a12bed ("x86, uv, uv3: Update x2apic Support for SGI UV3")
Link: http://lkml.kernel.org/r/20161123221908.GA23997@mwanda
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/kernel/apic/x2apic_uv_x.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/apic/x2apic_uv_x.c b/arch/x86/kernel/apic/x2apic_uv_x.c
index aeef53c..35690a1 100644
--- a/arch/x86/kernel/apic/x2apic_uv_x.c
+++ b/arch/x86/kernel/apic/x2apic_uv_x.c
@@ -815,9 +815,9 @@ static __init void map_mmioh_high_uv3(int index, int min_pnode, int max_pnode)
 				l = li;
 			}
 			addr1 = (base << shift) +
-				f * (unsigned long)(1 << m_io);
+				f * (1ULL << m_io);
 			addr2 = (base << shift) +
-				(l + 1) * (unsigned long)(1 << m_io);
+				(l + 1) * (1ULL << m_io);
 			pr_info("UV: %s[%03d..%03d] NASID 0x%04x ADDR 0x%016lx - 0x%016lx\n",
 				id, fi, li, lnasid, addr1, addr2);
 			if (max_io < l)