linux-kernel - Re: [Kernel-BR] [PATCH] btrfs: Fix memory leakage in the tree-log.c

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Date:	Wed, 9 Oct 2013 20:28:48 -0300
From:	Geyslan Gregório Bem <geyslan@...il.com>
To:	Felipe Pena <felipensp@...il.com>
Cc:	kernel-br <kernel-br@...glegroups.com>, chris.mason@...ionio.com,
	linux-btrfs@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [Kernel-BR] [PATCH] btrfs: Fix memory leakage in the tree-log.c

Felipe, thank you,

Sending v2.

Geyslan Gregório Bem
hackingbits.com


2013/10/9 Felipe Pena <felipensp@...il.com>:
> Hi,
>
> On Wed, Oct 9, 2013 at 8:13 PM, Geyslan G. Bem <geyslan@...il.com> wrote:
>> In some cases, add_inode_ref() is returning without freeing
>> the 'name' pointer.
>>
>> Added bail out to explicitly call kfree when necessary.
>>
>> Signed-off-by: Geyslan G. Bem <geyslan@...il.com>
>> ---
>>  fs/btrfs/tree-log.c | 13 ++++++++++---
>>  1 file changed, 10 insertions(+), 3 deletions(-)
>>
>> diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c
>> index 79f057c..37d32c3 100644
>> --- a/fs/btrfs/tree-log.c
>> +++ b/fs/btrfs/tree-log.c
>> @@ -1170,13 +1170,18 @@ static noinline int add_inode_ref(struct btrfs_trans_handle *trans,
>>                         if (!dir)
>>                                 dir = read_one_inode(root, parent_objectid);
>>                         if (!dir)
>> -                               return -ENOENT;
>> +                       {
>> +                               ret = -ENOENT;
>> +                               goto bail;
>> +                       }
>
> No braces required here.
>
>
>>                 } else {
>>                         ret = ref_get_fields(eb, ref_ptr, &namelen, &name,
>>                                              &ref_index);
>>                 }
>>                 if (ret)
>> -                       return ret;
>> +               {
>> +                       goto bail;
>> +               }
>>
>
> Ditto.
>
>>                 /* if we already have a perfect match, we're done */
>>                 if (!inode_in_dir(root, path, btrfs_ino(dir), btrfs_ino(inode),
>> @@ -1214,7 +1219,6 @@ static noinline int add_inode_ref(struct btrfs_trans_handle *trans,
>>                 }
>>
>>                 ref_ptr = (unsigned long)(ref_ptr + ref_struct_size) + namelen;
>> -               kfree(name);
>>                 if (log_ref_ver) {
>>                         iput(dir);
>>                         dir = NULL;
>> @@ -1227,6 +1231,9 @@ out:
>>         btrfs_release_path(path);
>>         iput(dir);
>>         iput(inode);
>> +bail:
>> +       if (name)
>> +               kfree(name);
>>         return ret;
>>  }
>>
>> --
>> 1.8.4
>>
>> --
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>> Para ver esta discussão na web, acesse https://groups.google.com/d/msgid/kernel-br/1381360387-27535-1-git-send-email-geyslan%40gmail.com.
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>
>
>
> --
> Regards,
> Felipe Pena
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