linux-kernel - [PATCH] tile: array underflow in setup

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Message-ID: <20170722073302.34qagmx66a6djxsi@mwanda>
Date:   Sat, 22 Jul 2017 10:33:02 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Chris Metcalf <cmetcalf@...lanox.com>
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH] tile: array underflow in setup_maxnodemem()

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>

diff --git a/arch/tile/kernel/setup.c b/arch/tile/kernel/setup.c
index 443a70bccc1c..b1474e7d9afb 100644
--- a/arch/tile/kernel/setup.c
+++ b/arch/tile/kernel/setup.c
@@ -140,7 +140,7 @@ static int __init setup_maxnodemem(char *str)
 {
 	char *endp;
 	unsigned long long maxnodemem;
-	long node;
+	unsigned long node;
 
 	node = str ? simple_strtoul(str, &endp, 0) : INT_MAX;
 	if (node >= MAX_NUMNODES || *endp != ':')