[PATCH 3.4 004/125] devres: fix a for loop bounds check

From: lizf
Date: Wed Oct 12 2016 - 08:35:23 EST


From: Dan Carpenter <dan.carpenter@xxxxxxxxxx>

3.4.113-rc1 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@xxxxxxxxxx>
Acked-by: Tejun Heo <tj@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Zefan Li <lizefan@xxxxxxxxxx>
---
lib/devres.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/devres.c b/lib/devres.c
index 80b9c76..584c2dc 100644
--- a/lib/devres.c
+++ b/lib/devres.c
@@ -390,7 +390,7 @@ 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;

--
1.9.1