[PATCH AUTOSEL 4.19 102/237] RISC-V: Avoid corrupting the upper 32-bit of phys_addr_t in ioremap

Sasha Levin
2019-11-16T15:43:25Z

From: Vincent Chen <vincentc@andestech.com>

[ Upstream commit 827a438156e4c423b6875a092e272933952a2910 ]

For 32bit, the upper 32-bit of phys_addr_t will be flushed to zero
after AND with PAGE_MASK because the data type of PAGE_MASK is
unsigned long. To fix this problem, the page alignment is done by
subtracting the page offset instead of AND with PAGE_MASK.

Signed-off-by: Vincent Chen <vincentc@andestech.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
arch/riscv/mm/ioremap.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/riscv/mm/ioremap.c b/arch/riscv/mm/ioremap.c
index 70ef2724cdf61..bd2f2db557cc5 100644
--- a/arch/riscv/mm/ioremap.c
+++ b/arch/riscv/mm/ioremap.c
@@ -42,7 +42,7 @@ static void __iomem *__ioremap_caller(phys_addr_t addr, size_t size,

/* Page-align mappings */
offset = addr & (~PAGE_MASK);
- addr &= PAGE_MASK;
+ addr -= offset;
size = PAGE_ALIGN(size + offset);

area = get_vm_area_caller(size, VM_IOREMAP, caller);
--
2.20.1