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From: Peter Zijlstra <peterz@infradead.org>
To: Ingo Molnar <mingo@kernel.org>
Cc: Yunsheng Lin <linyunsheng@huawei.com>,
	dalias@libc.org, linux-sh@vger.kernel.org,
	catalin.marinas@arm.com, dave.hansen@linux.intel.com,
	heiko.carstens@de.ibm.com, linuxarm@huawei.com,
	jiaxun.yang@flygoat.com, linux-mips@vger.kernel.org,
	mwb@linux.vnet.ibm.com, paulus@samba.org, hpa@zytor.com,
	sparclinux@vger.kernel.org, chenhc@lemote.com, will@kernel.org,
	cai@lca.pw, linux-s390@vger.kernel.org,
	ysato@users.sourceforge.jp, mpe@ellerman.id.au, x86@kernel.org,
	rppt@linux.ibm.com, borntraeger@de.ibm.com, dledford@redhat.com,
	mingo@redhat.com, jeffrey.t.kirsher@intel.com,
	benh@kernel.crashing.org, jhogan@kernel.org,
	nfont@linux.vnet.ibm.com, mattst88@gmail.com,
	len.brown@intel.com, gor@linux.ibm.com,
	anshuman.khandual@arm.com, bp@alien8.de, luto@kernel.org,
	tglx@linutronix.de, naveen.n.rao@linux.vnet.ibm.com,
	linux-arm-kernel@lists.infradead.org, rth@twiddle.net,
	axboe@kernel.dk, linuxppc-dev@lists.ozlabs.org,
	linux-kernel@vger.kernel.org, ralf@linux-mips.org,
	tbogendoerfer@suse.de, paul.burton@mips.com,
	linux-alpha@vger.kernel.org, ink@jurassic.park.msu.ru,
	akpm@linux-foundation.org, robin.murphy@arm.com,
	davem@davemloft.net
Subject: [PATCH] x86/mm: Fix cpumask_of_node() error condition
Date: Tue, 3 Sep 2019 09:53:52 +0200
Message-ID: <20190903075352.GY2369@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <20190902181731.GB35858@gmail.com>

On Mon, Sep 02, 2019 at 08:17:31PM +0200, Ingo Molnar wrote:

> Nitpicking: please also fix the kernel message to say ">=".

Full patch below.

---
Subject: x86/mm: Fix cpumask_of_node() error condition

When CONFIG_DEBUG_PER_CPU_MAPS we validate that the @node argument of
cpumask_of_node() is a valid node_id. It however forgets to check for
negative numbers. Fix this by explicitly casting to unsigned.

  (unsigned)node >= nr_node_ids

verifies: 0 <= node < nr_node_ids

Also ammend the error message to match the condition.

Acked-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
---
 arch/x86/mm/numa.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/mm/numa.c b/arch/x86/mm/numa.c
index e6dad600614c..4123100e0eaf 100644
--- a/arch/x86/mm/numa.c
+++ b/arch/x86/mm/numa.c
@@ -861,9 +861,9 @@ void numa_remove_cpu(int cpu)
  */
 const struct cpumask *cpumask_of_node(int node)
 {
-	if (node >= nr_node_ids) {
+	if ((unsigned)node >= nr_node_ids) {
 		printk(KERN_WARNING
-			"cpumask_of_node(%d): node > nr_node_ids(%u)\n",
+			"cpumask_of_node(%d): (unsigned)node >= nr_node_ids(%u)\n",
 			node, nr_node_ids);
 		dump_stack();
 		return cpu_none_mask;

  reply index

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-31  5:58 [PATCH v2 0/9] check the node id consistently across different arches Yunsheng Lin
2019-08-31  5:58 ` [PATCH v2 1/9] arm64: numa: check the node id consistently for arm64 Yunsheng Lin
2019-08-31  5:58 ` [PATCH v2 2/9] x86: numa: check the node id consistently for x86 Yunsheng Lin
2019-08-31  8:55   ` Peter Zijlstra
2019-08-31 10:09     ` Yunsheng Lin
2019-08-31 16:12       ` Peter Zijlstra
2019-09-01  4:45         ` Something about loongson_llsc_mb 陈华才
     [not found]           ` <2019090410032559707512@loongson.cn>
2019-09-04  9:21             ` Peter Zijlstra
2019-09-04 10:04               ` Peter Zijlstra
2019-09-04 12:57               ` Huang Pei
2019-09-02  5:46         ` [PATCH v2 2/9] x86: numa: check the node id consistently for x86 Yunsheng Lin
2019-09-02  7:25           ` Peter Zijlstra
2019-09-02 12:25             ` Yunsheng Lin
2019-09-02 12:56               ` Peter Zijlstra
2019-09-02 18:22                 ` Ingo Molnar
2019-09-02 19:14                   ` Peter Zijlstra
2019-09-03  6:19                 ` Yunsheng Lin
2019-09-03  7:11                   ` Peter Zijlstra
2019-09-03  8:31                     ` Yunsheng Lin
2019-09-02 18:17             ` Ingo Molnar
2019-09-03  7:53               ` Peter Zijlstra [this message]
2019-08-31  5:58 ` [PATCH v2 3/9] alpha: numa: check the node id consistently for alpha Yunsheng Lin
2019-08-31  5:58 ` [PATCH v2 4/9] powerpc: numa: check the node id consistently for powerpc Yunsheng Lin
2019-08-31  5:58 ` [PATCH v2 5/9] s390: numa: check the node id consistently for s390 Yunsheng Lin
2019-09-02  4:05   ` kbuild test robot
2019-08-31  5:58 ` [PATCH v2 6/9] sh: numa: check the node id consistently for sh Yunsheng Lin
2019-08-31  5:58 ` [PATCH v2 7/9] sparc64: numa: check the node id consistently for sparc64 Yunsheng Lin
2019-08-31  6:53   ` David Miller
2019-08-31  8:57     ` Yunsheng Lin
2019-08-31 20:02       ` David Miller
2019-09-02  6:08         ` Yunsheng Lin
2019-09-02 15:17           ` David Miller
2019-08-31  5:58 ` [PATCH v2 8/9] mips: numa: check the node id consistently for mips ip27 Yunsheng Lin
2019-08-31  5:58 ` [PATCH v2 9/9] mips: numa: check the node id consistently for mips loongson64 Yunsheng Lin

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