sysfs: use memdup_user() (1c8542c7) · Commits · 戴 / test

fs/sysfs/bin.c

+3 −10

Original line number	Diff line number	Diff line
		@@ -157,14 +157,9 @@ static ssize_t write(struct file file, const char __user userbuf,
		count = size - offs;
		}

		temp = kmalloc(count, GFP_KERNEL);
		if (!temp)
		return -ENOMEM;

		if (copy_from_user(temp, userbuf, count)) {
		count = -EFAULT;
		goto out_free;
		}
		temp = memdup_user(userbuf, count);
		if (IS_ERR(temp))
		return PTR_ERR(temp);

		mutex_lock(&bb->mutex);

		@@ -176,8 +171,6 @@ static ssize_t write(struct file file, const char __user userbuf,
		if (count > 0)
		*off = offs + count;

		out_free:
		kfree(temp);
		return count;
		}