From: Mike Rapoport <rppt@xxxxxxxxxxxxx> [ Upstream commit 023accf5cdc1e504a9b04187ec23ff156fe53d90 ] 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@xxxxxxxxxxxxx> Tested-by: Tony Lindgren <tony@xxxxxxxxxxx> Link: https://lore.kernel.org/lkml/20210630071211.21011-1-rppt@xxxxxxxxxx/ Signed-off-by: Mark-PK Tsai <mark-pk.tsai@xxxxxxxxxxxx> --- mm/memblock.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/mm/memblock.c b/mm/memblock.c index c337df03b6a1..faa4de579b3d 100644 --- a/mm/memblock.c +++ b/mm/memblock.c @@ -182,6 +182,8 @@ bool __init_memblock memblock_overlaps_region(struct memblock_type *type, { unsigned long i; + memblock_cap_size(base, &size); + for (i = 0; i < type->cnt; i++) if (memblock_addrs_overlap(base, size, type->regions[i].base, type->regions[i].size)) @@ -1792,7 +1794,6 @@ bool __init_memblock memblock_is_region_memory(phys_addr_t base, phys_addr_t siz */ bool __init_memblock memblock_is_region_reserved(phys_addr_t base, phys_addr_t size) { - memblock_cap_size(base, &size); return memblock_overlaps_region(&memblock.reserved, base, size); } -- 2.18.0
