PCI: Fix overflow in command-line resource alignment requests

stable inclusion
from stable-5.10.4
commit 2df49a5de565ba5ed1c492e83e01b7d5d7c3a35d
bugzilla: 46903

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

[ Upstream commit cc73eb32 ]

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: 32a9a682 ("PCI: allow assignment of memory resources with a specified alignment")
Signed-off-by: NColin Ian King <colin.king@canonical.com>
Signed-off-by: NBjorn Helgaas <bhelgaas@google.com>
Reviewed-by: NLogan Gunthorpe <logang@deltatee.com>
Signed-off-by: NSasha Levin <sashal@kernel.org>
Signed-off-by: NChen Jun <chenjun102@huawei.com>
Acked-by: NXie XiuQi <xiexiuqi@huawei.com>

drivers/pci/pci.c

@@ -6216,7 +6216,7 @@ 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",