linux-kernel - [PATCH 5.4 189/453] PCI: Fix overflow in command-line resource alignment requests

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Date:   Mon, 28 Dec 2020 13:47:05 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Colin Ian King <colin.king@...onical.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Logan Gunthorpe <logang@...tatee.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.4 189/453] PCI: Fix overflow in command-line resource alignment requests

From: Colin Ian King <colin.king@...onical.com>

[ Upstream commit cc73eb321d246776e5a9f7723d15708809aa3699 ]

The shift of 1 by align_order is evaluated using 32 bit arithmetic and the
result is assigned to a resource_size_t type variable that is a 64 bit
unsigned integer on 64 bit platforms. Fix an overflow before widening issue
by making the 1 a ULL.

Addresses-Coverity: ("Unintentional integer overflow")
Fixes: 32a9a682bef2 ("PCI: allow assignment of memory resources with a specified alignment")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
Reviewed-by: Logan Gunthorpe <logang@...tatee.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/pci/pci.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 158a7aa2a8e6e..89dece8a41321 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -6143,7 +6143,7 @@ static resource_size_t pci_specified_resource_alignment(struct pci_dev *dev,
 		ret = pci_dev_str_match(dev, p, &p);
 		if (ret == 1) {
 			*resize = true;
-			align = 1 << align_order;
+			align = 1ULL << align_order;
 			break;
 		} else if (ret < 0) {
 			pr_err("PCI: Can't parse resource_alignment parameter: %s\n",
-- 
2.27.0