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platform/x86: toshiba_acpi: use memdup_user_nul 

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

Signed-off-by: Geliang Tang <geliangtang@gmail.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
This commit is contained in:
Geliang Tang 2017-05-06 23:40:19 +08:00 committed by Andy Shevchenko
parent 7f36314599
commit f0ee1a6d31
1 changed files with 3 additions and 8 deletions
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11
drivers/platform/x86/toshiba_acpi.c
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@ -1502,14 +1502,9 @@ static ssize_t video_proc_write(struct file *file, const char __user *buf,
int ret;
u32 video_out;
cmd = kmalloc(count + 1, GFP_KERNEL);
if (!cmd)
return -ENOMEM;
if (copy_from_user(cmd, buf, count)) {
kfree(cmd);
return -EFAULT;
}
cmd[count] = '\0';
cmd = memdup_user_nul(buf, count);
if (IS_ERR(cmd))
return PTR_ERR(cmd);
buffer = cmd;