linux-kernel - [patch 3/3] btrfs: dereferencing freed memory

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Message-ID: <20100320112448.GX5331@bicker>
Date:	Sat, 20 Mar 2010 14:24:48 +0300
From:	Dan Carpenter <error27@...il.com>
To:	Chris Mason <chris.mason@...cle.com>
Cc:	Yan Zheng <zheng.yan@...cle.com>, Josef Bacik <josef@...hat.com>,
	Sage Weil <sage@...dream.net>,
	Al Viro <viro@...iv.linux.org.uk>, linux-btrfs@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [patch 3/3] btrfs: dereferencing freed memory

The original code dereferenced range on the next line.

Signed-off-by: Dan Carpenter <error27@...il.com>

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index be9b5df..d7ab56c 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -1378,6 +1378,7 @@ static int btrfs_ioctl_defrag(struct file *file, void __user *argp)
 					   sizeof(*range))) {
 				ret = -EFAULT;
 				kfree(range);
+				goto out;
 			}
 			/* compression requires us to start the IO */
 			if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) {
--
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