From: Chao Gao chao.gao@intel.com
[ 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@intel.com Reviewed-by: Dongli Zhang dongli.zhang@oracle.com Signed-off-by: Christoph Hellwig hch@lst.de Signed-off-by: Sasha Levin sashal@kernel.org --- 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.