linux-kernel - [PATCH] ext4: Fix memory leak in ext4_init_new

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Message-ID: <20130111100639.GA3302@suse.de>
Date:	Fri, 11 Jan 2013 10:06:39 +0000
From:	Mel Gorman <mgorman@...e.de>
To:	Theodore Ts'o <tytso@....edu>
Cc:	Tao Ma <boyu.mt@...bao.com>, linux-ext4@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] ext4: Fix memory leak in ext4_init_new_dir

Commit a774f9c2 "ext4: make ext4_init_dot_dotdot for inline dir usage"
is a preparation cleanup for later ext4 patches but there was a snag
when moving code to the newly created ext4_init_new_dir() function.
ext4_bread() is called twice but brelse() is only called one leading to a
memory leak. The user-visible effect is that after a compile-orientated
benchmark 0% of memory could be allocated as transparent huge pages.
This patch deletes the extra call and after it is applied, 76% of memory
could be allocated after the same test.

Signed-off-by: Mel Gorman <mgorman@...e.de>
---
 fs/ext4/namei.c |    1 -
 1 file changed, 1 deletion(-)

diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index 8990165..d068885 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -2368,7 +2368,6 @@ static int ext4_init_new_dir(handle_t *handle, struct inode *dir,
 	}

 	inode->i_size = EXT4_I(inode)->i_disksize = blocksize;
-	dir_block = ext4_bread(handle, inode, 0, 1, &err);
 	if (!(dir_block = ext4_bread(handle, inode, 0, 1, &err))) {
 		if (!err) {
 			err = -EIO;
--
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