linux-kernel - Re: memory leak in nfs_get

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Message-ID: <83F17B36-F557-45CD-B59B-30335D33E49B@redhat.com>
Date:   Tue, 02 Jul 2019 14:29:48 -0400
From:   "Benjamin Coddington" <bcodding@...hat.com>
To:     "Eric Biggers" <ebiggers@...nel.org>
Cc:     syzbot <syzbot+7fe11b49c1cc30e3fce2@...kaller.appspotmail.com>,
        anna.schumaker@...app.com, linux-kernel@...r.kernel.org,
        linux-nfs@...r.kernel.org, syzkaller-bugs@...glegroups.com,
        trond.myklebust@...merspace.com
Subject: Re: memory leak in nfs_get_client

On 2 Jul 2019, at 12:11, Eric Biggers wrote:

> On Tue, Jul 02, 2019 at 07:23:32AM -0400, Benjamin Coddington wrote:
>> On 2 Jul 2019, at 2:31, Eric Biggers wrote:
>>
>>> On Tue, Jun 11, 2019 at 12:23:12PM -0400, Benjamin Coddington wrote:
>>>> Ugh.. Now that you can cancel the wait, you have to also handle if
>>>> "new" was
>>>> allocated.  I think this needs:
>>>>
>>>> diff --git a/fs/nfs/client.c b/fs/nfs/client.c
>>>> index d7e4f0848e28..4d90f5bf0b0a 100644
>>>> --- a/fs/nfs/client.c
>>>> +++ b/fs/nfs/client.c
>>>> @@ -406,10 +406,10 @@ struct nfs_client *nfs_get_client(const 
>>>> struct
>>>> nfs_client_initdata *cl_init)
>>>>                 clp = nfs_match_client(cl_init);
>>>>                 if (clp) {
>>>>                         spin_unlock(&nn->nfs_client_lock);
>>>> -                       if (IS_ERR(clp))
>>>> -                               return clp;
>>>>                         if (new)
>>>>                                 new->rpc_ops->free_client(new);
>>>> +                       if (IS_ERR(clp))
>>>> +                               return clp;
>>>>                         return nfs_found_client(cl_init, clp);
>>>>                 }
>>>>                 if (new) {
>>>>
>>>> I'll patch/test and send it along.
>>>>
>>>> Ben
>>>
>>> Hi Ben, what happened to this patch?
>>
>> I sent it along:
>>
>> https://lore.kernel.org/linux-nfs/65b675cec79d140df64bc30def88b1def32bf87e.1560272160.git.bcodding@redhat.com/
>>
>> I don't think it will go in 5.2.. it's not a huge problem.
>>
>> Ben
>
> Okay, great.  I didn't see it in linux-next and there was no further 
> reply to
> this thread, which usually (having seen it happen on lots of syzbot 
> bugs) means
> the person forgot about it.
>
> Tip: you can use the '--in-reply-to=<MESSAGE_ID>' option to 'git 
> send-email' or
> 'git format-patch' to send the patch in response to the original 
> thread, which
> makes it very easy to see that a patch was actually sent out.

Yep, that's nice for those following along, but sometimes I think that 
makes
it harder for the maintainers to scrape the patches off the list.  I've 
had
patches get dropped that were buried at the end of a long discussion, so
I've made a habit of always making patches the top.

Ben