platform/x86: thinkpad_acpi: Use strndup_user() in dispatch_proc_write() (35d13c7a) · Commits · 戴 / test

drivers/platform/x86/thinkpad_acpi.c

+3 −11

Original line number	Diff line number	Diff line
		@@ -885,19 +885,11 @@ static ssize_t dispatch_proc_write(struct file *file,

		if (!ibm \|\| !ibm->write)
		return -EINVAL;
		if (count > PAGE_SIZE - 1)
		return -EINVAL;

		kernbuf = kmalloc(count + 1, GFP_KERNEL);
		if (!kernbuf)
		return -ENOMEM;

		if (copy_from_user(kernbuf, userbuf, count)) {
		kfree(kernbuf);
		return -EFAULT;
		}
		kernbuf = strndup_user(userbuf, PAGE_SIZE);
		if (IS_ERR(kernbuf))
		return PTR_ERR(kernbuf);

		kernbuf[count] = 0;
		ret = ibm->write(kernbuf);
		if (ret == 0)
		ret = count;