linux-kernel - [PATCH 2.6.32 33/38] [PATCH 33/38] devres: fix a for loop bounds check

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Message-Id: <20151129214704.289904990@1wt.eu>
Date:	Sun, 29 Nov 2015 22:47:35 +0100
From:	Willy Tarreau <w@....eu>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Dan Carpenter <dan.carpenter@...cle.com>,
	Tejun Heo <tj@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Ben Hutchings <ben@...adent.org.uk>, Willy Tarreau <w@....eu>
Subject: [PATCH 2.6.32 33/38] [PATCH 33/38] devres: fix a for loop bounds check

2.6.32-longterm review patch.  If anyone has any objections, please let me know.

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

commit 1f35d04a02a652f14566f875aef3a6f2af4cb77b upstream.

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>
Acked-by: Tejun Heo <tj@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
(cherry picked from commit e7102453150c7081a27744989374c474d2ebea8e)

Signed-off-by: Willy Tarreau <w@....eu>
---
 lib/devres.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/devres.c b/lib/devres.c
index 72c8909..e4891d5 100644
--- a/lib/devres.c
+++ b/lib/devres.c
@@ -338,7 +338,7 @@ void pcim_iounmap_regions(struct pci_dev *pdev, u16 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;
 
-- 
1.7.12.2.21.g234cd45.dirty



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