linux-kernel - Re: [PATCH v2 2/2] mmc: cqhci: Fix a tiny potential memory leak on error condition

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Date:   Wed, 27 Feb 2019 15:44:18 +0200
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Alamy Liu <alamy.liu@...il.com>,
        Asutosh Das <asutoshd@...eaurora.org>,
        Ritesh Harjani <riteshh@...eaurora.org>,
        Ulf Hansson <ulf.hansson@...aro.org>
Cc:     linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org
Subject: Re: [PATCH v2 2/2] mmc: cqhci: Fix a tiny potential memory leak on
 error condition

On 25/02/19 9:22 PM, Alamy Liu wrote:
> Free up the allocated memory in the case of error return
> 
> --- code study ---
> The value of mmc_host->cqe_enabled stays 'false'.
> Thus, cqhci_disable (mmc_cqe_ops->cqe_disable) won't be called to
> free the memory.
> Also, cqhci_disable() seems to be designed to disable and free
> all resources, not suitable to handle this corner case.
> 
> Fixes: a4080225f51d ("mmc: cqhci: support for command queue enabled host")
> Signed-off-by: Alamy Liu <alamy.liu@...il.com>

Acked-by: Adrian Hunter <adrian.hunter@...el.com>

> ---
>  drivers/mmc/host/cqhci.c | 11 ++++++++++-
>  1 file changed, 10 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/mmc/host/cqhci.c b/drivers/mmc/host/cqhci.c
> index 974997b6cb..795893ba47 100644
> --- a/drivers/mmc/host/cqhci.c
> +++ b/drivers/mmc/host/cqhci.c
> @@ -218,12 +218,21 @@ static int cqhci_host_alloc_tdl(struct cqhci_host *cq_host)
>  						 cq_host->desc_size,
>  						 &cq_host->desc_dma_base,
>  						 GFP_KERNEL);
> +	if (!cq_host->desc_base)
> +		return -ENOMEM;
> +
>  	cq_host->trans_desc_base = dmam_alloc_coherent(mmc_dev(cq_host->mmc),
>  					      cq_host->data_size,
>  					      &cq_host->trans_desc_dma_base,
>  					      GFP_KERNEL);
> -	if (!cq_host->desc_base || !cq_host->trans_desc_base)
> +	if (!cq_host->trans_desc_base) {
> +		dmam_free_coherent(mmc_dev(cq_host->mmc), cq_host->desc_size,
> +				   cq_host->desc_base,
> +				   cq_host->desc_dma_base);
> +		cq_host->desc_base = NULL;
> +		cq_host->desc_dma_base = 0;
>  		return -ENOMEM;
> +	}
>  
>  	pr_debug("%s: cqhci: desc-base: 0x%p trans-base: 0x%p\n desc_dma 0x%llx trans_dma: 0x%llx\n",
>  		 mmc_hostname(cq_host->mmc), cq_host->desc_base, cq_host->trans_desc_base,
>