I got a B. The homework was to find and write an exploit for 10 security holes in deployed software, but I only found 2. (3 including the one above, which I must have found the week or so after exams. The holes I found were in nasm and in some amateur open-source smtpd.)

FWIW, the exams are quite thought-provoking nearly 10 years later, here's a link to them: http://cr.yp.to/2004-494.html