linux-kernel - [PATCH 5.4 16/18] memblock: ensure there is no overflow in memblock_overlaps

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Message-Id: <20211215172023.368732496@linuxfoundation.org>
Date:   Wed, 15 Dec 2021 18:21:37 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Tony Lindgren <tony@...mide.com>,
        Mark-PK Tsai <mark-pk.tsai@...iatek.com>
Subject: [PATCH 5.4 16/18] memblock: ensure there is no overflow in memblock_overlaps_region()

From: Mike Rapoport <rppt@...ux.ibm.com>

commit 023accf5cdc1e504a9b04187ec23ff156fe53d90 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@...ux.ibm.com>
Tested-by: Tony Lindgren <tony@...mide.com>
Link: https://lore.kernel.org/lkml/20210630071211.21011-1-rppt@kernel.org/
Signed-off-by: Mark-PK Tsai <mark-pk.tsai@...iatek.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 mm/memblock.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -164,6 +164,8 @@ bool __init_memblock memblock_overlaps_r
 {
 	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))
@@ -1760,7 +1762,6 @@ bool __init_memblock memblock_is_region_
  */
 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);
 }