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swiotlb: avoid potential left shift overflow

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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: 26a7e09478 ("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>
This commit is contained in:
Chao Gao 2022-08-19 16:45:37 +08:00 committed by Christoph Hellwig
parent 2995b8002c
commit 3f0461613e
1 changed files with 4 additions and 1 deletions
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5
kernel/dma/swiotlb.c
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@ -575,7 +575,10 @@ 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.