linux-kernel - [PATCH 3.2 01/94] tile: array underflow in setup

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Date:   Thu, 28 Dec 2017 16:59:12 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Chris Metcalf" <cmetcalf@...lanox.com>,
        "Dan Carpenter" <dan.carpenter@...cle.com>
Subject: [PATCH 3.2 01/94] tile: array underflow in setup_maxnodemem()

3.2.97-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Dan Carpenter <dan.carpenter@...cle.com>

commit 637f23abca87d26e091e0d6647ec878d97d2c6cd upstream.

My static checker correctly complains that we should have a lower bound
on "node" to prevent an array underflow.

Fixes: 867e359b97c9 ("arch/tile: core support for Tilera 32-bit chips.")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Chris Metcalf <cmetcalf@...lanox.com>
[bwh: Backported to 3.2: keep maxnodemem_mb as long]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
--- a/arch/tile/kernel/setup.c
+++ b/arch/tile/kernel/setup.c
@@ -119,7 +119,8 @@ early_param("maxmem", setup_maxmem);
 static int __init setup_maxnodemem(char *str)
 {
 	char *endp;
-	long maxnodemem_mb, node;
+	long maxnodemem_mb;
+	unsigned long node;
 
 	node = str ? simple_strtoul(str, &endp, 0) : INT_MAX;
 	if (node >= MAX_NUMNODES || *endp != ':' ||