memblock: ensure there is no overflow in memblock_overlaps_region()
commit 023accf5cd
upstream.
There maybe an overflow in memblock_overlaps_region() if it is called with
base and size such that
base + size > PHYS_ADDR_MAX
Make sure that memblock_overlaps_region() caps the size to prevent such
overflow and remove now duplicated call to memblock_cap_size() from
memblock_is_region_reserved().
Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
Tested-by: Tony Lindgren <tony@atomide.com>
Link: https://lore.kernel.org/lkml/20210630071211.21011-1-rppt@kernel.org/
Signed-off-by: Mark-PK Tsai <mark-pk.tsai@mediatek.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -164,6 +164,8 @@ bool __init_memblock memblock_overlaps_region(struct memblock_type *type,
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{
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unsigned long i;
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memblock_cap_size(base, &size);
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for (i = 0; i < type->cnt; i++)
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if (memblock_addrs_overlap(base, size, type->regions[i].base,
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type->regions[i].size))
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@ -1760,7 +1762,6 @@ bool __init_memblock memblock_is_region_memory(phys_addr_t base, phys_addr_t siz
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*/
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bool __init_memblock memblock_is_region_reserved(phys_addr_t base, phys_addr_t size)
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{
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memblock_cap_size(base, &size);
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return memblock_overlaps_region(&memblock.reserved, base, size);
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}
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