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| author |   Mike Rapoport <rppt@linux.ibm.com> | 2021-06-30 09:12:13 +0300 |
|---|---|---|
| committer | Mike Rapoport <rppt@linux.ibm.com> | 2021-06-30 11:38:56 +0300 |
| commit | 023accf5cdc1e504a9b04187ec23ff156fe53d90 (patch) | |
| tree | 4bd82ea2aa7444345e9d13a3eec68267cc9da07f /mm/memblock.c | |
| parent | memblock: align freed memory map on pageblock boundaries with SPARSEMEM (diff) | |
| download | linux-dev-023accf5cdc1e504a9b04187ec23ff156fe53d90.tar.xz linux-dev-023accf5cdc1e504a9b04187ec23ff156fe53d90.zip | |
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 <rppt@linux.ibm.com>
Tested-by: Tony Lindgren <tony@atomide.com>
Diffstat (limited to 'mm/memblock.c')
| -rw-r--r-- | mm/memblock.c | 3 |
1 files changed, 2 insertions, 1 deletions
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); } |