Re: [PATCH v29 0/1] MR9414: shlwapi: Handling of "C:\...xx" in PathCanonicalize[AW].

[Yuxuan Shui (＠yshui)]

Yuxuan Shui (@yshui) commented about dlls/kernelbase/path.c:
> +            if ((dst > buffer + 2) && dst[-2] == '\\' && dst[-1] == '.')
>              {
> -                src += 2; /* Skip .\ */
> +                dst -= 1; /* Skip .\ */
> +                src++;
>              }
> -            else if (src[1] == '.' && dst != buffer && dst[-1] == '\\')
> +            else if ((dst > buffer + 4) && dst[-3] == '\\' && dst[-2] == '.' && dst[-1] == '.')
>              {
> -                /* \.. backs up a directory, over the root if it has no \ following X:.
> -                 * .. is ignored if it would remove a UNC server name or initial \\
> -                 */
> -                if (dst != buffer)
> +                /* \.. backs up a directory */
> +                dst -= 4;
> +                while (dst > buffer && *dst != '\\')
> Are we worried about backing up over a device letter in this case? i.e. `C:\\..\\something`

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https://gitlab.winehq.org/wine/wine/-/merge_requests/9414#note_126502