libvorbis -- two vulnerabilities

Two vulnerabilities were fixed in the upstream repository:

The bark_noise_hybridmp function allows remote attackers
to cause a denial of service (out-of-bounds access and
application crash) or possibly have unspecified other
impact via a crafted file.
mapping0_forward does not validate the number of
channels, which allows remote attackers to cause a denial
of service (heap-based buffer overflow or over-read) or
possibly have unspecified other impact via a crafted
file.