linux-kernel - Re: [PATCH rdma-rc v3] RDMA/core: Always release restrack object

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Date:   Tue, 29 Jun 2021 20:06:11 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Leon Romanovsky <leon@...nel.org>
Cc:     Doug Ledford <dledford@...hat.com>,
        Leon Romanovsky <leonro@...dia.com>,
        linux-kernel@...r.kernel.org, linux-rdma@...r.kernel.org,
        Pavel Skripkin <paskripkin@...il.com>,
        Shay Drory <shayd@...dia.com>
Subject: Re: [PATCH rdma-rc v3] RDMA/core: Always release restrack object

On Tue, Jun 29, 2021 at 09:49:33AM +0300, Leon Romanovsky wrote:
> From: Leon Romanovsky <leonro@...dia.com>
> 
> Change location of rdma_restrack_del() to fix the bug where
> task_struct was acquired but not released, causing to resource leak.
> 
>   ucma_create_id() {
>     ucma_alloc_ctx();
>     rdma_create_user_id() {
>       rdma_restrack_new();
>       rdma_restrack_set_name() {
>         rdma_restrack_attach_task.part.0(); <--- task_struct was gotten
>       }
>     }
>     ucma_destroy_private_ctx() {
>       ucma_put_ctx();
>       rdma_destroy_id() {
>         _destroy_id()                       <--- id_priv was freed
>       }
>     }
>   }
> 
> Fixes: 889d916b6f8a ("RDMA/core: Don't access cm_id after its destruction")
> Reported-by: Pavel Skripkin <paskripkin@...il.com>
> Signed-off-by: Leon Romanovsky <leonro@...dia.com>
> ---
> ---
> Changelog:
> v3:
>  * Dropped controversial hunks and updated commit message respectively
> v2: https://lore.kernel.org/lkml/e2eed941f912b2068e371fd37f43b8cf5082a0e6.1623129597.git.leonro@nvidia.com
>  * Added bug report analysis
> v1: https://lore.kernel.org/linux-rdma/f72e27d5c82cd9beec7670141afa62786836c569.1622956637.git.leonro@nvidia.com/T/#u
> ---
>  drivers/infiniband/core/cma.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Applied to for-next, thanks

Jason