1f922f82d8
The integer overflow happens when utf8_encoded_valid_unichar() returns an error code. The error code is a negative number: -22. This overflows when it is assigned to `z` (type `size_t`). This can cause an infinite loop if the value of `q` is 22 or larger. To reproduce the bug, you need to run `systemd-ask-password` and enter an invalid unicode character, followed by a backspace character. GHSL-2021-052 (cherry picked from commit 37ca78a35cd1b9f13e584ccf3d332413c7875e40) (cherry picked from commit 069525e84a67375e27429cb490e8d28af78e673a)
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