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mmc: block: Check return value of blk_get_request()

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commit fb8e456e54 upstream.

blk_get_request() can fail, always check the return value.

Fixes: 0493f6fe5b ("mmc: block: Move boot partition locking into a driver op")
Fixes: 3ecd8cf23f ("mmc: block: move multi-ioctl() to use block layer")
Fixes: 614f0388f5 ("mmc: block: move single ioctl() commands to block requests")
Fixes: 627c3ccfb4 ("mmc: debugfs: Move block debugfs into block module")
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Adrian Hunter 2017-11-21 15:42:28 +02:00 committed by Greg Kroah-Hartman
parent 0d8d2b6373
commit 957c27d456
1 changed files with 19 additions and 1 deletions
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20
drivers/mmc/core/block.c
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@ -204,6 +204,10 @@ 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;
@ -220,7 +224,7 @@ 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;
}
@ -581,6 +585,10 @@ 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 = MMC_DRV_OP_IOCTL;
req_to_mmc_queue_req(req)->drv_op_data = idatas;
@ -644,6 +652,10 @@ 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 = MMC_DRV_OP_IOCTL;
req_to_mmc_queue_req(req)->drv_op_data = idata;
req_to_mmc_queue_req(req)->ioc_count = num_of_cmds;
@ -2315,6 +2327,8 @@ 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;
@ -2349,6 +2363,10 @@ 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);