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mmc: core: Use memdup_user() rather than duplicating its implementation

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Reuse existing functionality from memdup_user() instead of keeping
duplicate source code.

This issue was detected by using the Coccinelle software.

Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Markus Elfring 2018-03-05 11:33:21 +01:00 committed by Ulf Hansson
parent e988867fd7
commit 97a0c3134f
1 changed files with 4 additions and 11 deletions
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15
drivers/mmc/core/block.c
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@ -375,22 +375,15 @@ static struct mmc_blk_ioc_data *mmc_blk_ioctl_copy_from_user(
return idata;
}
idata->buf = kmalloc(idata->buf_bytes, GFP_KERNEL);
if (!idata->buf) {
err = -ENOMEM;
idata->buf = memdup_user((void __user *)(unsigned long)
idata->ic.data_ptr, idata->buf_bytes);
if (IS_ERR(idata->buf)) {
err = PTR_ERR(idata->buf);
goto idata_err;
}
if (copy_from_user(idata->buf, (void __user *)(unsigned long)
idata->ic.data_ptr, idata->buf_bytes)) {
err = -EFAULT;
goto copy_err;
}
return idata;
copy_err:
kfree(idata->buf);
idata_err:
kfree(idata);
out: