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SubjectRe: [PATCH v2 2/2] mmc: cqhci: Fix a tiny potential memory leak on error condition
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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@gmail.com>

Acked-by: Adrian Hunter <adrian.hunter@intel.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,
>

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