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gwinhttpfile: Avoid arithmetic overflow when calculating a size

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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
This commit is contained in:
Philip Withnall 2021-02-04 16:12:24 +00:00
parent 19470722b3
commit 81a454237d
1 changed files with 4 additions and 4 deletions
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8
gio/win32/gwinhttpfile.c
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@ -409,10 +409,10 @@ g_winhttp_file_resolve_relative_path (GFile *file,
child = g_object_new (G_TYPE_WINHTTP_FILE, NULL);
child->vfs = winhttp_file->vfs;
child->url = winhttp_file->url;
child->url.lpszScheme = g_memdup2 (winhttp_file->url.lpszScheme, (winhttp_file->url.dwSchemeLength+1)*2);
child->url.lpszHostName = g_memdup2 (winhttp_file->url.lpszHostName, (winhttp_file->url.dwHostNameLength+1)*2);
child->url.lpszUserName = g_memdup2 (winhttp_file->url.lpszUserName, (winhttp_file->url.dwUserNameLength+1)*2);
child->url.lpszPassword = g_memdup2 (winhttp_file->url.lpszPassword, (winhttp_file->url.dwPasswordLength+1)*2);
child->url.lpszScheme = g_memdup2 (winhttp_file->url.lpszScheme, ((gsize) winhttp_file->url.dwSchemeLength + 1) * 2);
child->url.lpszHostName = g_memdup2 (winhttp_file->url.lpszHostName, ((gsize) winhttp_file->url.dwHostNameLength + 1) * 2);
child->url.lpszUserName = g_memdup2 (winhttp_file->url.lpszUserName, ((gsize) winhttp_file->url.dwUserNameLength + 1) * 2);
child->url.lpszPassword = g_memdup2 (winhttp_file->url.lpszPassword, ((gsize) winhttp_file->url.dwPasswordLength + 1) * 2);
child->url.lpszUrlPath = wnew_path;
child->url.dwUrlPathLength = wcslen (wnew_path);
child->url.lpszExtraInfo = NULL;