linux-kernel - Re: [PATCH V14 02/24] mmc: block: Check return value of blk_get

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Date:   Thu, 23 Nov 2017 19:12:51 +0100
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Adrian Hunter <adrian.hunter@...el.com>
Cc:     linux-mmc <linux-mmc@...r.kernel.org>,
        linux-block <linux-block@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Bough Chen <haibo.chen@....com>,
        Alex Lemberg <alex.lemberg@...disk.com>,
        Mateusz Nowak <mateusz.nowak@...el.com>,
        Yuliy Izrailov <Yuliy.Izrailov@...disk.com>,
        Jaehoon Chung <jh80.chung@...sung.com>,
        Dong Aisheng <dongas86@...il.com>,
        Das Asutosh <asutoshd@...eaurora.org>,
        Zhangfei Gao <zhangfei.gao@...il.com>,
        Sahitya Tummala <stummala@...eaurora.org>,
        Harjani Ritesh <riteshh@...eaurora.org>,
        Venu Byravarasu <vbyravarasu@...dia.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Shawn Lin <shawn.lin@...k-chips.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Christoph Hellwig <hch@....de>
Subject: Re: [PATCH V14 02/24] mmc: block: Check return value of blk_get_request()

On 21 November 2017 at 14:42, Adrian Hunter <adrian.hunter@...el.com> wrote:
> blk_get_request() can fail, always check the return value.
>
> Fixes: 0493f6fe5bde ("mmc: block: Move boot partition locking into a driver op")
> Fixes: 3ecd8cf23f88 ("mmc: block: move multi-ioctl() to use block layer")
> Fixes: 614f0388f580 ("mmc: block: move single ioctl() commands to block requests")
> Fixes: 627c3ccfb46a ("mmc: debugfs: Move block debugfs into block module")
> Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>

Thanks, applied for fixes and added a stable tag!

Kind regards
Uffe

> ---
>  drivers/mmc/core/block.c | 20 +++++++++++++++++++-
>  1 file changed, 19 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c
> index f60939858586..4a319ddbd956 100644
> --- a/drivers/mmc/core/block.c
> +++ b/drivers/mmc/core/block.c
> @@ -233,6 +233,10 @@ static ssize_t power_ro_lock_store(struct device *dev,
>
>         /* Dispatch locking to the block layer */
>         req = blk_get_request(mq->queue, REQ_OP_DRV_OUT, __GFP_RECLAIM);
> +       if (IS_ERR(req)) {
> +               count = PTR_ERR(req);
> +               goto out_put;
> +       }
>         req_to_mmc_queue_req(req)->drv_op = MMC_DRV_OP_BOOT_WP;
>         blk_execute_rq(mq->queue, NULL, req, 0);
>         ret = req_to_mmc_queue_req(req)->drv_op_result;
> @@ -249,7 +253,7 @@ static ssize_t power_ro_lock_store(struct device *dev,
>                                 set_disk_ro(part_md->disk, 1);
>                         }
>         }
> -
> +out_put:
>         mmc_blk_put(md);
>         return count;
>  }
> @@ -625,6 +629,10 @@ static int mmc_blk_ioctl_cmd(struct mmc_blk_data *md,
>         req = blk_get_request(mq->queue,
>                 idata->ic.write_flag ? REQ_OP_DRV_OUT : REQ_OP_DRV_IN,
>                 __GFP_RECLAIM);
> +       if (IS_ERR(req)) {
> +               err = PTR_ERR(req);
> +               goto cmd_done;
> +       }
>         idatas[0] = idata;
>         req_to_mmc_queue_req(req)->drv_op =
>                 rpmb ? MMC_DRV_OP_IOCTL_RPMB : MMC_DRV_OP_IOCTL;
> @@ -692,6 +700,10 @@ static int mmc_blk_ioctl_multi_cmd(struct mmc_blk_data *md,
>         req = blk_get_request(mq->queue,
>                 idata[0]->ic.write_flag ? REQ_OP_DRV_OUT : REQ_OP_DRV_IN,
>                 __GFP_RECLAIM);
> +       if (IS_ERR(req)) {
> +               err = PTR_ERR(req);
> +               goto cmd_err;
> +       }
>         req_to_mmc_queue_req(req)->drv_op =
>                 rpmb ? MMC_DRV_OP_IOCTL_RPMB : MMC_DRV_OP_IOCTL;
>         req_to_mmc_queue_req(req)->drv_op_data = idata;
> @@ -2551,6 +2563,8 @@ static int mmc_dbg_card_status_get(void *data, u64 *val)
>
>         /* Ask the block layer about the card status */
>         req = blk_get_request(mq->queue, REQ_OP_DRV_IN, __GFP_RECLAIM);
> +       if (IS_ERR(req))
> +               return PTR_ERR(req);
>         req_to_mmc_queue_req(req)->drv_op = MMC_DRV_OP_GET_CARD_STATUS;
>         blk_execute_rq(mq->queue, NULL, req, 0);
>         ret = req_to_mmc_queue_req(req)->drv_op_result;
> @@ -2585,6 +2599,10 @@ static int mmc_ext_csd_open(struct inode *inode, struct file *filp)
>
>         /* Ask the block layer for the EXT CSD */
>         req = blk_get_request(mq->queue, REQ_OP_DRV_IN, __GFP_RECLAIM);
> +       if (IS_ERR(req)) {
> +               err = PTR_ERR(req);
> +               goto out_free;
> +       }
>         req_to_mmc_queue_req(req)->drv_op = MMC_DRV_OP_GET_EXT_CSD;
>         req_to_mmc_queue_req(req)->drv_op_data = &ext_csd;
>         blk_execute_rq(mq->queue, NULL, req, 0);
> --
> 1.9.1
>