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

From: Geyslan GregÃrio Bem
Date: Wed Oct 09 2013 - 19:28:54 EST


Felipe, thank you,

Sending v2.

Geyslan GregÃrio Bem
hackingbits.com


2013/10/9 Felipe Pena <felipensp@xxxxxxxxx>:
> Hi,
>
> On Wed, Oct 9, 2013 at 8:13 PM, Geyslan G. Bem <geyslan@xxxxxxxxx> 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@xxxxxxxxx>
>> ---
>> 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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