linux-kernel - [PATCH 3.13 129/151] ocfs2: fix panic on kfree(xattr->name)

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Message-Id: <1399045139-4531-130-git-send-email-kamal@canonical.com>
Date:	Fri,  2 May 2014 08:38:37 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
	Joel Becker <jlbec@...lplan.org>,
	Mark Fasheh <mfasheh@...e.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.13 129/151] ocfs2: fix panic on kfree(xattr->name)

3.13.11.1 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>

commit f81c20158f8d5f7938d5eb86ecc42ecc09273ce6 upstream.

Commit 9548906b2bb7 ('xattr: Constify ->name member of "struct xattr"')
missed that ocfs2 is calling kfree(xattr->name).  As a result, kernel
panic occurs upon calling kfree(xattr->name) because xattr->name refers
static constant names.  This patch removes kfree(xattr->name) from
ocfs2_mknod() and ocfs2_symlink().

Signed-off-by: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
Reported-by: Tariq Saeed <tariq.x.saeed@...cle.com>
Tested-by: Tariq Saeed <tariq.x.saeed@...cle.com>
Reviewed-by: Srinivas Eeda <srinivas.eeda@...cle.com>
Cc: Joel Becker <jlbec@...lplan.org>
Cc: Mark Fasheh <mfasheh@...e.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 fs/ocfs2/namei.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/fs/ocfs2/namei.c b/fs/ocfs2/namei.c
index 4f791f6..2baabab 100644
--- a/fs/ocfs2/namei.c
+++ b/fs/ocfs2/namei.c
@@ -430,7 +430,6 @@ leave:
 
 	brelse(new_fe_bh);
 	brelse(parent_fe_bh);
-	kfree(si.name);
 	kfree(si.value);
 
 	ocfs2_free_dir_lookup_result(&lookup);
@@ -1818,7 +1817,6 @@ bail:
 
 	brelse(new_fe_bh);
 	brelse(parent_fe_bh);
-	kfree(si.name);
 	kfree(si.value);
 	ocfs2_free_dir_lookup_result(&lookup);
 	if (inode_ac)
-- 
1.9.1

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