linux-kernel - Re: memory leak in nfs_get

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Date:   Tue, 02 Jul 2019 07:23:32 -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 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