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spi: spidev: use memdup_user

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Use memdup_user() helper instead of open-coding to simplify the code.

Signed-off-by: Geliang Tang <geliangtang@gmail.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Geliang Tang 2017-05-06 23:42:17 +08:00 committed by Mark Brown
parent 76bf569466
commit f7929436a2
1 changed files with 1 additions and 9 deletions
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10
drivers/spi/spidev.c
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@ -324,7 +324,6 @@ static struct spi_ioc_transfer *
spidev_get_ioc_message(unsigned int cmd, struct spi_ioc_transfer __user *u_ioc,
unsigned *n_ioc)
{
struct spi_ioc_transfer *ioc;
u32 tmp;
/* Check type, command number and direction */
@ -341,14 +340,7 @@ spidev_get_ioc_message(unsigned int cmd, struct spi_ioc_transfer __user *u_ioc,
return NULL;
/* copy into scratch area */
ioc = kmalloc(tmp, GFP_KERNEL);
if (!ioc)
return ERR_PTR(-ENOMEM);
if (__copy_from_user(ioc, u_ioc, tmp)) {
kfree(ioc);
return ERR_PTR(-EFAULT);
}
return ioc;
return memdup_user(u_ioc, tmp);
}
static long