commit a01f45e3ced23c799f6e78b5efdbd32198a75354
author Willy Tarreau <w@1wt.eu> Mon Dec 31 07:41:24 2018 +0100
committer Willy Tarreau <w@1wt.eu> Tue Jan 08 13:20:59 2019 +0100
tree f288c2494b11339589089b84e7d3f272a713f448
parent 202c6ce1a27c92d21995ee82c71b2f70c636e3ea

BUG/CRITICAL: mux-h2: re-check the frame length when PRIORITY is used

Tim Düsterhus reported a possible crash in the H2 HEADERS frame decoder
when the PRIORITY flag is present. A check is missing to ensure the 5
extra bytes needed with this flag are actually part of the frame. As per
RFC7540#4.2, let's return a connection error with code FRAME_SIZE_ERROR.

Many thanks to Tim for responsibly reporting this issue with a working
config and reproducer. This issue was assigned CVE-2018-20615.

This fix must be backported to 1.9 and 1.8.