linux-kernel - Re: [PATCH] infiniband: core: fix memory leak

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Message-ID: <YL8BDyMQKym5v7ob@unreal>
Date:   Tue, 8 Jun 2021 08:33:03 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     Jason Gunthorpe <jgg@...pe.ca>
Cc:     Pavel Skripkin <paskripkin@...il.com>, dledford@...hat.com,
        shayd@...dia.com, linux-rdma@...r.kernel.org,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH] infiniband: core: fix memory leak

On Mon, Jun 07, 2021 at 08:44:49PM -0300, Jason Gunthorpe wrote:
> On Sun, Jun 06, 2021 at 08:21:51AM +0300, Leon Romanovsky wrote:
>  
> > I think that better fix is:
> > https://lore.kernel.org/linux-rdma/f72e27d5c82cd9beec7670141afa62786836c569.1622956637.git.leonro@nvidia.com/T/#u
> 
> Can you resend that with the bug report in the comment?

Done,
https://lore.kernel.org/linux-rdma/e2eed941f912b2068e371fd37f43b8cf5082a0e6.1623129597.git.leonro@nvidia.com/T/#u

>  
> What is the issue? Some error path missed a restrack_del? which one?

All paths that called to rdma_restrack_new(), but didn't set "id_priv->cma_dev" yet.
For example, cma_ib_new_conn_id() -> __rdma_create_id() -> do something -> exit on
error -> miss call to rdma_restrack_del()

> 
> And I still dislike that patch for adding restrack_del and undoing the
> previous patch which was trying to get rid of it, but if it actually
> fixes a bug...

And I didn't like the previous patch :).

Thanks

> 
> Jason