From: Mike Rapoport rppt@linux.ibm.com
mainline inclusion from mainline-v5.14-rc1 commit 023accf5cdc1e504a9b04187ec23ff156fe53d90 category: bugfix bugzilla: 172285 https://gitee.com/openeuler/kernel/issues/I4DDEL
-----------------------------------------------
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 Signed-off-by: Chen Huang chenhuang5@huawei.com Reviewed-by: Chen Wandun chenwandun@huawei.com Signed-off-by: Zheng Zengkai zhengzengkai@huawei.com --- mm/memblock.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/mm/memblock.c b/mm/memblock.c index d85893ab2f22..7b25c54ab5c8 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)) @@ -1804,7 +1806,6 @@ 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); }