linux-kernel - [PATCH 3.12 095/123] Btrfs: fix memory leak in the extent

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Message-Id: <30f9f03c581a86ae1fe575b0645cc5fa9bf4ce88.1438699154.git.jslaby@suse.cz>
Date:	Tue,  4 Aug 2015 16:40:39 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Filipe Manana <fdmanana@...e.com>,
	Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 095/123] Btrfs: fix memory leak in the extent_same ioctl

From: Filipe Manana <fdmanana@...e.com>

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

===============

commit 497b4050e0eacd4c746dd396d14916b1e669849d upstream.

We were allocating memory with memdup_user() but we were never releasing
that memory. This affected pretty much every call to the ioctl, whether
it deduplicated extents or not.

This issue was reported on IRC by Julian Taylor and on the mailing list
by Marcel Ritter, credit goes to them for finding the issue.

Reported-by: Julian Taylor <jtaylor.debian@...glemail.com>
Reported-by: Marcel Ritter <ritter.marcel@...il.com>
Signed-off-by: Filipe Manana <fdmanana@...e.com>
Reviewed-by: Mark Fasheh <mfasheh@...e.de>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 fs/btrfs/ioctl.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index d43cd15c3097..5f597cf570be 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -2707,7 +2707,7 @@ static long btrfs_ioctl_file_extent_same(struct file *file,
 					 void __user *argp)
 {
 	struct btrfs_ioctl_same_args tmp;
-	struct btrfs_ioctl_same_args *same;
+	struct btrfs_ioctl_same_args *same = NULL;
 	struct btrfs_ioctl_same_extent_info *info;
 	struct inode *src = file->f_dentry->d_inode;
 	struct file *dst_file = NULL;
@@ -2833,6 +2833,7 @@ next:
 
 out:
 	mnt_drop_write_file(file);
+	kfree(same);
 	return ret;
 }
 
-- 
2.5.0

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