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[4.19.y-cip,22/26] PCI: endpoint: Cast the page number to phys_addr_t

Message ID 20201020145732.30343-23-prabhakar.mahadev-lad.rj@bp.renesas.com (mailing list archive)
State Accepted
Headers show
Series Fixes and extension to PCIe EPF | expand

Commit Message

Lad Prabhakar Oct. 20, 2020, 2:57 p.m. UTC 
From: Alan Mikhak <alan.mikhak@sifive.com>

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 <alan.mikhak@sifive.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Acked-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
---
 drivers/pci/endpoint/pci-epc-mem.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/drivers/pci/endpoint/pci-epc-mem.c b/drivers/pci/endpoint/pci-epc-mem.c
index 0471643cf536..abfac1109a13 100644
--- a/drivers/pci/endpoint/pci-epc-mem.c
+++ b/drivers/pci/endpoint/pci-epc-mem.c
@@ -136,7 +136,7 @@  void __iomem *pci_epc_mem_alloc_addr(struct pci_epc *epc,
 	if (pageno < 0)
 		goto ret;
 
-	*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);