linux-kernel - [RESENT PATCH] logfs: Check for the return value after calling find_or_create

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Message-ID: <52A84C8E.5090209@gmail.com>
Date:	Wed, 11 Dec 2013 19:29:18 +0800
From:	Younger Liu <younger.liucn@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	joern@...fs.org, prasadjoshi.linux@...il.com, logfs@...fs.org,
	kernel <linux-kernel@...r.kernel.org>,
	fs-devel <linux-fsdevel@...r.kernel.org>, liuyiyang@...ense.com
Subject: [RESENT PATCH] logfs: Check for the return value after calling find_or_create_page()

From: Younger Liu <liuyiyang@...ense.com>

  In get_mapping_page(), after calling find_or_create_page(),
the return value should be checked.

  This patch has been provided:
http://www.spinics.net/lists/linux-fsdevel/msg66948.html
but not been applied now.

Signed-off-by: Younger Liu <liuyiyang@...ense.com>
Cc: Younger Liu <younger.liucn@...il.com>
Cc: Vyacheslav Dubeyko <slava@...eyko.com>
Reviewed-by: Prasad Joshi <prasadjoshi.linux@...il.com>
---
 fs/logfs/segment.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/logfs/segment.c b/fs/logfs/segment.c
index d448a77..7f9b096 100644
--- a/fs/logfs/segment.c
+++ b/fs/logfs/segment.c
@@ -62,7 +62,8 @@ static struct page *get_mapping_page(struct
super_block *sb, pgoff_t index,
 		page = read_cache_page(mapping, index, filler, sb);
 	else {
 		page = find_or_create_page(mapping, index, GFP_NOFS);
-		unlock_page(page);
+		if (page)
+			unlock_page(page);
 	}
 	return page;
 }
-- 
1.7.9.5

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