devres: fix a for loop bounds check

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@oracle.com>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
(cherry picked from commit e7102453150c7081a27744989374c474d2ebea8e)

Signed-off-by: Willy Tarreau <w@1wt.eu>

diff --git a/lib/devres.c b/lib/devres.c
index 72c8909006da156a41c4a70a1de2562198b45103..e4891d5103a5efef167c2360a850f58b648fa8d4 100644 (file)
--- 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;