linux-kernel - Re: [PATCH] RDMA/cma: Fix listener leak in rdma_cma_listen_on

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Date:   Mon, 13 Sep 2021 14:16:19 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     Tao Liu <thomas.liu@...oud.cn>
Cc:     dledford@...hat.com, jgg@...pe.ca, haakon.bugge@...cle.com,
        shayd@...dia.com, avihaih@...dia.com, linux-rdma@...r.kernel.org,
        linux-kernel@...r.kernel.org, thomas.liu@...oud.com
Subject: Re: [PATCH] RDMA/cma: Fix listener leak in rdma_cma_listen_on_all()
 failure

On Mon, Sep 13, 2021 at 05:33:44PM +0800, Tao Liu wrote:
> rdma_cma_listen_on_all() just destroy listener which lead to an error,
> but not including those already added in listen_list. Then cm state
> fallbacks to RDMA_CM_ADDR_BOUND.
> 
> When user destroys id, the listeners will not be destroyed, and
> process stucks.
> 
>  task:rping state:D stack:   0 pid:19605 ppid: 47036 flags:0x00000084
>  Call Trace:
>   __schedule+0x29a/0x780
>   ? free_unref_page_commit+0x9b/0x110
>   schedule+0x3c/0xa0
>   schedule_timeout+0x215/0x2b0
>   ? __flush_work+0x19e/0x1e0
>   wait_for_completion+0x8d/0xf0
>   _destroy_id+0x144/0x210 [rdma_cm]
>   ucma_close_id+0x2b/0x40 [rdma_ucm]
>   __destroy_id+0x93/0x2c0 [rdma_ucm]
>   ? __xa_erase+0x4a/0xa0
>   ucma_destroy_id+0x9a/0x120 [rdma_ucm]
>   ucma_write+0xb8/0x130 [rdma_ucm]
>   vfs_write+0xb4/0x250
>   ksys_write+0xb5/0xd0
>   ? syscall_trace_enter.isra.19+0x123/0x190
>   do_syscall_64+0x33/0x40
>   entry_SYSCALL_64_after_hwframe+0x44/0xa9
> 
> Fixes: c80a0c52d85c ("RDMA/cma: Add missing error handling of listen_id")
> Signed-off-by: Tao Liu <thomas.liu@...oud.cn>
> ---
>  drivers/infiniband/core/cma.c | 22 +++++++++++++++-------
>  1 file changed, 15 insertions(+), 7 deletions(-)
> 

Thanks,
Reviewed-by: Leon Romanovsky <leonro@...dia.com>