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List: linux-btrfs
Subject: Re: [PATCH] Btrfs: fix memory leak in btrfs_create_tree()
From: Tsutomu Itoh <t-itoh () jp ! fujitsu ! com>
Date: 2014-03-31 8:41:08
Message-ID: 53392A24.4020702 () jp ! fujitsu ! com
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Hi Alex,
On 2014/03/28 0:50, Alex Lyakas wrote:
> Hi Tsutomu Itoh,
>
> On Thu, Mar 21, 2013 at 6:32 AM, Tsutomu Itoh <t-itoh@jp.fujitsu.com> wrote:
>> We should free leaf and root before returning from the error
>> handling code.
>>
>> Signed-off-by: Tsutomu Itoh <t-itoh@jp.fujitsu.com>
>> ---
>> fs/btrfs/disk-io.c | 12 +++++++++---
>> 1 file changed, 9 insertions(+), 3 deletions(-)
>>
>> diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
>> index 7d84651..b1b5baa 100644
>> --- a/fs/btrfs/disk-io.c
>> +++ b/fs/btrfs/disk-io.c
>> @@ -1291,6 +1291,7 @@ struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans,
>> 0, objectid, NULL, 0, 0, 0);
>> if (IS_ERR(leaf)) {
>> ret = PTR_ERR(leaf);
>> + leaf = NULL;
>> goto fail;
>> }
>>
>> @@ -1334,11 +1335,16 @@ struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans,
>>
>> btrfs_tree_unlock(leaf);
>>
>> + return root;
>> +
>> fail:
>> - if (ret)
>> - return ERR_PTR(ret);
>> + if (leaf) {
>> + btrfs_tree_unlock(leaf);
>> + free_extent_buffer(leaf);
> I believe this is not enough. Few lines above, another reference on
> the root is taken by
> root->commit_root = btrfs_root_node(root);
Thank you for pointing this out.
You are right.
Could you re-post your fix by the patch submitting form?
Thanks,
Tsutomu
>
> So I believe the proper fix would be:
> diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
> index d9698fd..260af79 100644
> --- a/fs/btrfs/disk-io.c
> +++ b/fs/btrfs/disk-io.c
> @@ -1354,10 +1354,10 @@ struct btrfs_root *btrfs_create_tree(struct
> btrfs_trans_handle *trans,
> return root;
>
> fail:
> - if (leaf) {
> + if (leaf)
> btrfs_tree_unlock(leaf);
> - free_extent_buffer(leaf);
> - }
> + free_extent_buffer(root->node);
> + free_extent_buffer(root->commit_root);
> kfree(root);
>
> return ERR_PTR(ret);
>
>
>
> Thanks,
> Alex.
>
>
>
>> + }
>> + kfree(root);
>>
>> - return root;
>> + return ERR_PTR(ret);
>> }
>>
>> static struct btrfs_root *alloc_log_tree(struct btrfs_trans_handle *trans,
>>
--
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