blob: 304ed8a5674613b79f5fa7813dffa84a29138762 [file] [log] [blame]
From 8c0a65ce73658d6bd0ade3af84f56a1a2817bcd4 Mon Sep 17 00:00:00 2001
From: Alan Mikhak <>
Date: Wed, 9 Oct 2019 10:06:56 -0700
Subject: [PATCH] PCI: endpoint: Cast the page number to phys_addr_t
commit daee4f4e42c792997f4fee47dcdfa65dd720ec02 upstream.
Modify pci_epc_mem_alloc_addr() to cast the variable 'pageno'
from type 'int' to 'phys_addr_t' before shifting left. This
cast is needed to avoid treating bit 31 of 'pageno' as the
sign bit which would otherwise get sign-extended to produce
a negative value. When added to the base address of PCI memory
space, the negative value would produce an invalid physical
address which falls before the start of the PCI memory space.
Signed-off-by: Alan Mikhak <>
Signed-off-by: Lorenzo Pieralisi <>
Acked-by: Kishon Vijay Abraham I <>
Signed-off-by: Paul Gortmaker <>
diff --git a/drivers/pci/endpoint/pci-epc-mem.c b/drivers/pci/endpoint/pci-epc-mem.c
index 2bf8bd1f0563..d2b174ce15de 100644
--- a/drivers/pci/endpoint/pci-epc-mem.c
+++ b/drivers/pci/endpoint/pci-epc-mem.c
@@ -134,7 +134,7 @@ void __iomem *pci_epc_mem_alloc_addr(struct pci_epc *epc,
if (pageno < 0)
return NULL;
- *phys_addr = mem->phys_base + (pageno << page_shift);
+ *phys_addr = mem->phys_base + ((phys_addr_t)pageno << page_shift);
virt_addr = ioremap(*phys_addr, size);
if (!virt_addr)
bitmap_release_region(mem->bitmap, pageno, order);