upload: incorrect duplicate name handling

[anonymousbugger]

In the file upload.php, there is a part that checks for duplicate filenames, and if so 'computes' a new name. What is the problem:
$filetype is the lowercased extension of the file, eg "jpg", but the real filename might be JPG. If this is the case, the line
$pos = strpos($tmppathtofile, '.'.trim($imgtype));
will return false.

The solution is
$pos = strpos(strtolower($tmppathtofile), '.'.trim($imgtype));

This all happens around line 115 of file upload.php in directory wp-admin.

[anonymousbugger]

This isn't the correct way to go about this; on *nix systems, filenames are case-sensitive. foo.jpg and foo.JPG are different files.