From: Chen Huang

Sent: 26 May 2021 10:20

The simple_strtoull() function is deprecated in some situation, since
it does not check for the range overflow, use kstrtoull() instead.

...

-	target_bytes = simple_strtoull(buf, &endchar, 0) * 1024;
+	ret = kstrtoull(buf, 0, &target_bytes);
+	if (ret)
+		return ret;
+	target_bytes *= 1024;

I'd have thought it was more important to check *endchar
than overflow.
If you are worried about overflow you need a range check
before the multiply.

	David

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