linux-kernel - [patch] devres: fix a for loop bounds check

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Message-ID: <20150921162151.GA5648@mwanda>
Date:	Mon, 21 Sep 2015 19:21:51 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>, htejun@...il.com
Cc:	Catalin Marinas <catalin.marinas@....com>,
	Cristian Stoica <cristian.stoica@...escale.com>,
	Dan Williams <dan.j.williams@...el.com>,
	Abhilash Kesavan <a.kesavan@...sung.com>,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [patch] devres: fix a for loop bounds check

The iomap[] array has PCIM_IOMAP_MAX (6) elements and not
DEVICE_COUNT_RESOURCE (16).  This bug was found using a static checker.
It may be that the "if (!(mask & (1 << i)))" check means we never
actually go past the end of the array in real life.

Fixes: ec04b075843d ('iomap: implement pcim_iounmap_regions()')
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>

diff --git a/lib/devres.c b/lib/devres.c
index f13a246..8c85672 100644
--- a/lib/devres.c
+++ b/lib/devres.c
@@ -418,7 +418,7 @@ void pcim_iounmap_regions(struct pci_dev *pdev, int mask)
 	if (!iomap)
 		return;
 
-	for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
+	for (i = 0; i < PCIM_IOMAP_MAX; i++) {
 		if (!(mask & (1 << i)))
 			continue;
 
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