From: Chao Gao <chao.gao@xxxxxxxxx>
[ Upstream commit 3f0461613ebcdc8c4073e235053d06d5aa58750f ]
The second operand passed to slot_addr() is declared as int or unsigned int
in all call sites. The left-shift to get the offset of a slot can overflow
if swiotlb size is larger than 4G.
Convert the macro to an inline function and declare the second argument as
phys_addr_t to avoid the potential overflow.
Fixes: 26a7e094783d ("swiotlb: refactor swiotlb_tbl_map_single")
Signed-off-by: Chao Gao <chao.gao@xxxxxxxxx>
Reviewed-by: Dongli Zhang <dongli.zhang@xxxxxxxxxx>
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
kernel/dma/swiotlb.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c
index e62fb7a4da694..018f140aaaf4e 100644
--- a/kernel/dma/swiotlb.c
+++ b/kernel/dma/swiotlb.c
@@ -435,7 +435,10 @@ static void swiotlb_bounce(struct device *dev, phys_addr_t tlb_addr, size_t size
}
}
-#define slot_addr(start, idx) ((start) + ((idx) << IO_TLB_SHIFT))
+static inline phys_addr_t slot_addr(phys_addr_t start, phys_addr_t idx)
+{
+ return start + (idx << IO_TLB_SHIFT);
+}
/*
* Carefully handle integer overflow which can occur when boundary_mask == ~0UL.
--
2.35.1
