From: AKASHI Takahiro <takahiro.akashi@linaro.org>
To: akpm@linux-foundation.org
Cc: paul.burton@imgtec.com, linux-kernel@vger.kernel.org,
linux-mm@kvack.org, AKASHI Takahiro <takahiro.akashi@linaro.org>
Subject: [PATCH] memblock: fix memblock_next_valid_pfn()
Date: Fri, 3 Mar 2017 11:37:45 +0900 [thread overview]
Message-ID: <20170303023745.9104-1-takahiro.akashi@linaro.org> (raw)
Obviously, we should not access memblock.memory.regions[right]
if 'right' is outside of [0..memblock.memory.cnt>.
Fixes: b92df1de5d28 ("mm: page_alloc: skip over regions of invalid pfns where possible")
Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
---
mm/memblock.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/mm/memblock.c b/mm/memblock.c
index b64b47803e52..696f06d17c4e 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -1118,7 +1118,10 @@ unsigned long __init_memblock memblock_next_valid_pfn(unsigned long pfn,
}
} while (left < right);
- return min(PHYS_PFN(type->regions[right].base), max_pfn);
+ if (right == type->cnt)
+ return max_pfn;
+ else
+ return min(PHYS_PFN(type->regions[right].base), max_pfn);
}
/**
--
2.11.1
reply other threads:[~2017-03-03 3:12 UTC|newest]
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