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From: Wen Congyang <wency@cn.fujitsu.com>
To: kexec@lists.infradead.org
Subject: [PATCH] makedumpfile: fix off-by-one bug in page_to_pfn()
Date: Wed, 23 Nov 2011 13:53:51 +0800	[thread overview]
Message-ID: <4ECC8A6F.3040606@cn.fujitsu.com> (raw)

The pfn region in a mmd is [mmd->pfn_start, mmd->pfn_end).
So the max index should be mmd->pfn_end - mmd->pfn_start -1.
If index >=(not >) mmd->pfn_end - mmd->pfn_start, we should check
the next mmd.

Signed-off-by: Wen Congyang <wency@cn.fujitsu.com>

---
 makedumpfile.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/makedumpfile.c b/makedumpfile.c
index 7b7c266..db8e53f 100644
--- a/makedumpfile.c
+++ b/makedumpfile.c
@@ -2879,7 +2879,7 @@ page_to_pfn(unsigned long page)
 		if (page < mmd->mem_map)
 			continue;
 		index = (page - mmd->mem_map) / SIZE(page);
-		if (index > mmd->pfn_end - mmd->pfn_start)
+		if (index >= mmd->pfn_end - mmd->pfn_start)
 			continue;
 		pfn = mmd->pfn_start + index;
 		break;
-- 
1.7.1

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             reply	other threads:[~2011-11-23  5:51 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-11-23  5:53 Wen Congyang [this message]
2011-11-24  5:20 ` [PATCH] makedumpfile: fix off-by-one bug in page_to_pfn() Atsushi Kumagai
2011-12-12  9:23   ` Wen Congyang
2011-12-13  0:21     ` tachibana
2011-12-13  0:36       ` Wen Congyang

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