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[um] mconsole: don't open-code memdup_user_nul()

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2016-01-02 14:53:28 -05:00
parent 1ceb36285c
commit 793b796ebf
1 changed files with 3 additions and 11 deletions
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14
arch/um/drivers/mconsole_kern.c
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@ -748,19 +748,11 @@ static ssize_t mconsole_proc_write(struct file *file,
{
char *buf;
buf = kmalloc(count + 1, GFP_KERNEL);
if (buf == NULL)
return -ENOMEM;
if (copy_from_user(buf, buffer, count)) {
count = -EFAULT;
goto out;
}
buf[count] = '\0';
buf = memdup_user_nul(buffer, count);
if (IS_ERR(buf))
return PTR_ERR(buf);
mconsole_notify(notify_socket, MCONSOLE_USER_NOTIFY, buf, count);
out:
kfree(buf);
return count;
}