linux-kernel - [PATCH v1 1/1] mm: Reversed logic in memblock

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Date:   Wed, 23 Aug 2017 14:04:01 -0400
From:   Pavel Tatashin <pasha.tatashin@...cle.com>
To:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        mhocko@...nel.org, akpm@...ux-foundation.org,
        terraluna977@...il.com
Subject: [PATCH v1 1/1] mm: Reversed logic in memblock_discard

In recently introduced memblock_discard() there is a reversed logic bug.
Memory is freed of static array instead of dynamically allocated one.

Fixes: 3010f876500f ("mm: discard memblock data later")

Reported-and-tested-by: Woody Suwalski <terraluna977@...il.com>
Signed-off-by: Pavel Tatashin <pasha.tatashin@...cle.com>
---
 mm/memblock.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/memblock.c b/mm/memblock.c
index bf14aea6ab70..91205780e6b1 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -299,7 +299,7 @@ void __init memblock_discard(void)
 		__memblock_free_late(addr, size);
 	}
 
-	if (memblock.memory.regions == memblock_memory_init_regions) {
+	if (memblock.memory.regions != memblock_memory_init_regions) {
 		addr = __pa(memblock.memory.regions);
 		size = PAGE_ALIGN(sizeof(struct memblock_region) *
 				  memblock.memory.max);
-- 
2.14.1