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From: Colin King <colin.king@canonical.com>
To: "Bjorn Helgaas" <bhelgaas@google.com>,
	"Christian König" <christian.koenig@amd.com>,
	"Stephen Bates" <sbates@raithlin.com>,
	"Logan Gunthorpe" <logang@deltatee.com>,
	"Alex Williamson" <alex.williamson@redhat.com>,
	linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: kernel-janitors@vger.kernel.org
Subject: [PATCH] PCI: fix a potential uninitentional integer overflow issue
Date: Wed,  7 Oct 2020 12:46:15 +0100	[thread overview]
Message-ID: <20201007114615.19966-1-colin.king@canonical.com> (raw)

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

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 using the BIT_ULL macro to perform the
shift.

Addresses-Coverity: ("Uninitentional integer overflow")
Fixes: 07d8d7e57c28 ("PCI: Make specifying PCI devices in kernel parameters reusable")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
---
 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 6d4d5a2f923d..1a5844d7af35 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -6209,7 +6209,7 @@ static resource_size_t pci_specified_resource_alignment(struct pci_dev *dev,
 			if (align_order == -1)
 				align = PAGE_SIZE;
 			else
-				align = 1 << align_order;
+				align = BIT_ULL(align_order);
 			break;
 		} else if (ret < 0) {
 			pr_err("PCI: Can't parse resource_alignment parameter: %s\n",
-- 
2.27.0


WARNING: multiple messages have this Message-ID (diff)
From: Colin King <colin.king@canonical.com>
To: "Bjorn Helgaas" <bhelgaas@google.com>,
	"Christian König" <christian.koenig@amd.com>,
	"Stephen Bates" <sbates@raithlin.com>,
	"Logan Gunthorpe" <logang@deltatee.com>,
	"Alex Williamson" <alex.williamson@redhat.com>,
	linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: kernel-janitors@vger.kernel.org
Subject: [PATCH] PCI: fix a potential uninitentional integer overflow issue
Date: Wed, 07 Oct 2020 11:46:15 +0000	[thread overview]
Message-ID: <20201007114615.19966-1-colin.king@canonical.com> (raw)

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

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 using the BIT_ULL macro to perform the
shift.

Addresses-Coverity: ("Uninitentional integer overflow")
Fixes: 07d8d7e57c28 ("PCI: Make specifying PCI devices in kernel parameters reusable")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
---
 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 6d4d5a2f923d..1a5844d7af35 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -6209,7 +6209,7 @@ static resource_size_t pci_specified_resource_alignment(struct pci_dev *dev,
 			if (align_order = -1)
 				align = PAGE_SIZE;
 			else
-				align = 1 << align_order;
+				align = BIT_ULL(align_order);
 			break;
 		} else if (ret < 0) {
 			pr_err("PCI: Can't parse resource_alignment parameter: %s\n",
-- 
2.27.0

             reply	other threads:[~2020-10-07 11:46 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-07 11:46 Colin King [this message]
2020-10-07 11:46 ` [PATCH] PCI: fix a potential uninitentional integer overflow issue Colin King
2020-10-07 12:33 ` Dan Carpenter
2020-10-07 12:33   ` Dan Carpenter
2020-11-05 22:24   ` Bjorn Helgaas
2020-11-05 22:24     ` Bjorn Helgaas
2020-11-06  8:04     ` Dan Carpenter
2020-11-06  8:04       ` Dan Carpenter
2020-11-10 20:54       ` Bjorn Helgaas
2020-11-10 20:54         ` Bjorn Helgaas
2020-11-10 22:00         ` Colin Ian King
2020-11-10 22:00           ` Colin Ian King

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