From 023accf5cdc1e504a9b04187ec23ff156fe53d90 Mon Sep 17 00:00:00 2001 From: Mike Rapoport Date: Wed, 30 Jun 2021 09:12:13 +0300 Subject: memblock: ensure there is no overflow in memblock_overlaps_region() 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 Tested-by: Tony Lindgren --- mm/memblock.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'mm/memblock.c') diff --git a/mm/memblock.c b/mm/memblock.c index 2e25d69739e0..67e0e24f8cc9 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)) @@ -1794,7 +1796,6 @@ 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); } -- cgit v1.2.3