[Buildroot] [PATCH 1/2] package/libvorbis: fix CVE-2018-10392

[Yann E. MORIN <yann.morin.1998@free.fr>]

Fabrice, All,

On 2020-03-01 19:02 +0100, Fabrice Fontaine spake thusly:
> mapping0_forward in mapping0.c in Xiph.Org libvorbis 1.3.6 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.
> 
> Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>

Applied to master, thanks.

Regards,
Yann E. MORIN.

> ---
>  ...ty-check-number-of-channels-in-setup.patch | 28 +++++++++++++++++++
>  package/libvorbis/libvorbis.mk                |  3 ++
>  2 files changed, 31 insertions(+)
>  create mode 100644 package/libvorbis/0002-Sanity-check-number-of-channels-in-setup.patch
> 
> diff --git a/package/libvorbis/0002-Sanity-check-number-of-channels-in-setup.patch b/package/libvorbis/0002-Sanity-check-number-of-channels-in-setup.patch
> new file mode 100644
> index 0000000000..1208839a20
> --- /dev/null
> +++ b/package/libvorbis/0002-Sanity-check-number-of-channels-in-setup.patch
> @@ -0,0 +1,28 @@
> +From 112d3bd0aaacad51305e1464d4b381dabad0e88b Mon Sep 17 00:00:00 2001
> +From: Thomas Daede <daede003@umn.edu>
> +Date: Thu, 17 May 2018 16:19:19 -0700
> +Subject: [PATCH] Sanity check number of channels in setup.
> +
> +Fixes #2335.
> +[Retrieved from:
> +https://gitlab.xiph.org/xiph/vorbis/commit/112d3bd0aaacad51305e1464d4b381dabad0e88b]
> +Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
> +---
> + lib/vorbisenc.c | 1 +
> + 1 file changed, 1 insertion(+)
> +
> +diff --git a/lib/vorbisenc.c b/lib/vorbisenc.c
> +index 4fc7b62..64a51b5 100644
> +--- a/lib/vorbisenc.c
> ++++ b/lib/vorbisenc.c
> +@@ -684,6 +684,7 @@ int vorbis_encode_setup_init(vorbis_info *vi){
> +   highlevel_encode_setup *hi=&ci->hi;
> + 
> +   if(ci==NULL)return(OV_EINVAL);
> ++  if(vi->channels<1||vi->channels>255)return(OV_EINVAL);
> +   if(!hi->impulse_block_p)i0=1;
> + 
> +   /* too low/high an ATH floater is nonsensical, but doesn't break anything */
> +-- 
> +2.24.1
> +
> diff --git a/package/libvorbis/libvorbis.mk b/package/libvorbis/libvorbis.mk
> index ae2c1efffe..bf479a3900 100644
> --- a/package/libvorbis/libvorbis.mk
> +++ b/package/libvorbis/libvorbis.mk
> @@ -13,4 +13,7 @@ LIBVORBIS_DEPENDENCIES = host-pkgconf libogg
>  LIBVORBIS_LICENSE = BSD-3-Clause
>  LIBVORBIS_LICENSE_FILES = COPYING
>  
> +# 0002-Sanity-check-number-of-channels-in-setup.patch
> +LIBVORBIS_IGNORE_CVES += CVE-2018-10392
> +
>  $(eval $(autotools-package))
> -- 
> 2.25.0
> 
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