linux-kernel - Re: [PATCH] RDMA/erdma: Fix refcount leak in erdma

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Date:   Wed, 21 Dec 2022 10:58:35 +0800
From:   Cheng Xu <chengyou@...ux.alibaba.com>
To:     Miaoqian Lin <linmq006@...il.com>,
        Kai Shen <kaishen@...ux.alibaba.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Leon Romanovsky <leon@...nel.org>,
        Wei Yongjun <weiyongjun1@...wei.com>,
        Yang Li <yang.lee@...ux.alibaba.com>,
        linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] RDMA/erdma: Fix refcount leak in erdma_mmap



On 12/20/22 8:11 PM, Miaoqian Lin wrote:
> rdma_user_mmap_entry_get() take reference, we should release it when not
> need anymore, add the missing rdma_user_mmap_entry_put() in the error
> path to fix it.
> 
> Fixes: 155055771704 ("RDMA/erdma: Add verbs implementation")
> Signed-off-by: Miaoqian Lin <linmq006@...il.com>
> ---
>  drivers/infiniband/hw/erdma/erdma_verbs.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 

Good catch, thanks.

Acked-by: Cheng Xu <chengyou@...ux.alibaba.com>


> diff --git a/drivers/infiniband/hw/erdma/erdma_verbs.c b/drivers/infiniband/hw/erdma/erdma_verbs.c
> index 5dab1e87975b..9c30d78730aa 100644
> --- a/drivers/infiniband/hw/erdma/erdma_verbs.c
> +++ b/drivers/infiniband/hw/erdma/erdma_verbs.c
> @@ -1110,12 +1110,14 @@ int erdma_mmap(struct ib_ucontext *ctx, struct vm_area_struct *vma)
>  		prot = pgprot_device(vma->vm_page_prot);
>  		break;
>  	default:
> -		return -EINVAL;
> +		err = -EINVAL;
> +		goto put_entry;
>  	}
>  
>  	err = rdma_user_mmap_io(ctx, vma, PFN_DOWN(entry->address), PAGE_SIZE,
>  				prot, rdma_entry);
>  
> +put_entry:
>  	rdma_user_mmap_entry_put(rdma_entry);
>  	return err;
>  }