linux-kernel - Re: [PATCH for-next v2 2/3] RDMA/rtrs: Fix the last iu->buf leak in err path

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Date:   Sun, 23 Apr 2023 10:56:30 +0800
From:   Guoqing Jiang <guoqing.jiang@...ux.dev>
To:     Li Zhijian <lizhijian@...itsu.com>, haris.iqbal@...os.com,
        jinpu.wang@...os.com, jgg@...pe.ca, leon@...nel.org,
        linux-rdma@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH for-next v2 2/3] RDMA/rtrs: Fix the last iu->buf leak in
 err path



On 4/23/23 09:26, Li Zhijian wrote:
> The last iu->buf will leak if ib_dma_mapping_error() fails.

Fixes: c0894b3ea69d("RDMA/rtrs: core: lib functions shared between 
client and server modules")

> Signed-off-by: Li Zhijian<lizhijian@...itsu.com>
> ---
> V2: new patch to address memory leaking
> ---
>   drivers/infiniband/ulp/rtrs/rtrs.c | 4 +++-
>   1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/infiniband/ulp/rtrs/rtrs.c b/drivers/infiniband/ulp/rtrs/rtrs.c
> index 4bf9d868cc52..3696f367ff51 100644
> --- a/drivers/infiniband/ulp/rtrs/rtrs.c
> +++ b/drivers/infiniband/ulp/rtrs/rtrs.c
> @@ -37,8 +37,10 @@ struct rtrs_iu *rtrs_iu_alloc(u32 iu_num, size_t size, gfp_t gfp_mask,
>   			goto err;
>   
>   		iu->dma_addr = ib_dma_map_single(dma_dev, iu->buf, size, dir);
> -		if (ib_dma_mapping_error(dma_dev, iu->dma_addr))
> +		if (ib_dma_mapping_error(dma_dev, iu->dma_addr)) {
> +			kfree(iu->buf);
>   			goto err;
> +		}
>   
>   		iu->cqe.done  = done;
>   		iu->size      = size;

Good catch, Acked-by: Guoqing Jiang <guoqing.jiang@...ux.dev>

Thanks,
Guoqing