Philip Withnall 81a454237d gwinhttpfile: Avoid arithmetic overflow when calculating a size
The members of `URL_COMPONENTS` (`winhttp_file->url`) are `DWORD`s, i.e.
32-bit unsigned integers. Adding to and multiplying them may cause them
to overflow the unsigned integer bounds, even if the result is passed to
`g_memdup2()` which accepts a `gsize`.

Cast the `URL_COMPONENTS` members to `gsize` first to ensure that the
arithmetic is done in terms of `gsize`s rather than unsigned integers.

Spotted by Sebastian Dröge.

Signed-off-by: Philip Withnall <pwithnall@endlessos.org>
Helps: #2319
2021-02-04 16:17:21 +00:00
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