linux-kernel - RE: [f2fs-dev] [PATCH] f2fs: avoid to left uninitialized data in page when read inline data

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Date:	Mon, 30 Dec 2013 09:29:06 +0800
From:	Chao Yu <chao2.yu@...sung.com>
To:	'???' <jaegeuk.kim@...sung.com>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-f2fs-devel@...ts.sourceforge.net
Subject: RE: [f2fs-dev] [PATCH] f2fs: avoid to left uninitialized data in page
 when read inline data

Change log from v1:
 o reduce unneeded memset in __f2fs_convert_inline_data

>>From 58796be2bd2becbe8d52305210fb2a64e7dd80b6 Mon Sep 17 00:00:00 2001
From: Chao Yu <chao2.yu@...sung.com>
Date: Mon, 30 Dec 2013 09:21:33 +0800
Subject: [PATCH] f2fs: avoid to left uninitialized data in page when read
 inline data

We left uninitialized data in the tail of page when we read an inline data
page. So let's initialize left part of the page excluding inline data region.

Signed-off-by: Chao Yu <chao2.yu@...sung.com>
---
 fs/f2fs/inline.c |    5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/fs/f2fs/inline.c b/fs/f2fs/inline.c
index 0e940ce..33a07e1 100644
--- a/fs/f2fs/inline.c
+++ b/fs/f2fs/inline.c
@@ -48,8 +48,7 @@ int f2fs_read_inline_data(struct inode *inode, struct page *page)
 	if (IS_ERR(ipage))
 		return PTR_ERR(ipage);
 
-	zero_user_segment(page, INLINE_DATA_OFFSET,
-				INLINE_DATA_OFFSET + MAX_INLINE_DATA);
+	zero_user_segment(page, MAX_INLINE_DATA, PAGE_CACHE_SIZE);
 
 	/* Copy the whole inline data block */
 	src_addr = inline_data_addr(ipage);
@@ -94,7 +93,7 @@ static int __f2fs_convert_inline_data(struct inode *inode, struct page *page)
 		return err;
 	}
 
-	zero_user_segment(page, 0, PAGE_CACHE_SIZE);
+	zero_user_segment(page, MAX_INLINE_DATA, PAGE_CACHE_SIZE);
 
 	/* Copy the whole inline data block */
 	src_addr = inline_data_addr(ipage);
-- 
1.7.9.5

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