dma-direct: fix data truncation in dma_direct_get_required_mask()

[ Upstream commit cdcda0d1f8f4ab84efe7cd9921c98364398aefd7 ]

The upper 32-bit physical address gets truncated inadvertently
when dma_direct_get_required_mask() invokes phys_to_dma_direct().
This results in dma_addressing_limited() return incorrect value
when used in platforms with LPAE enabled.
Fix it here by explicitly type casting 'max_pfn' to phys_addr_t
in order to prevent overflow of intermediate value while evaluating
'(max_pfn - 1) << PAGE_SHIFT'.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/kernel/dma/direct.c b/kernel/dma/direct.c
index 867fd72..0a093a6 100644 (file)
--- a/kernel/dma/direct.c
+++ b/kernel/dma/direct.c
@@ -45,7 +45,8 @@ static inline dma_addr_t phys_to_dma_direct(struct device *dev,
 
 u64 dma_direct_get_required_mask(struct device *dev)
 {
-       u64 max_dma = phys_to_dma_direct(dev, (max_pfn - 1) << PAGE_SHIFT);
+       phys_addr_t phys = (phys_addr_t)(max_pfn - 1) << PAGE_SHIFT;
+       u64 max_dma = phys_to_dma_direct(dev, phys);
 
        return (1ULL << (fls64(max_dma) - 1)) * 2 - 1;
 }