Bug#802625: libvdpau crashes on 64-bit machines when DRI_PRIME env variable set

[Rinat]

Source: libvdpau
Version: 1.1.1-1
Severity: important
Tags: patch

Dear Maintainer,

recent version of libvdpau have switched from getenv() to secure_getenv(),
but due to the missing definition, prototype of secure_getenv() is missing.
Normally, it would return (char *) as getenv() do, but with missing prototype,
compiler assumes returning of (int), which clamps 64-bit pointer to lower
32-bit part. That have no effect on 32-bit installations, but on 64-bit
machines results in a corrupted pointer, and subsequent crash.

Issue triggers only if system is 64-bit and DRI_PRIME environment variable
set.

Patch fixing the issue was already pushed to the upstream repository, in [1]
just after libvdpau-1.1.1 release.

Please, consider applying the patch to the package.


[1] http://cgit.freedesktop.org/~aplattner/libvdpau/patch/?id=1cda354bdfd0c9ca107293b84b52f4464fdbedcc


-- System Information:
Debian Release: stretch/sid
  APT prefers testing
  APT policy: (500, 'testing'), (50, 'unstable'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.2.0-1-amd64 (SMP w/8 CPU cores)
Locale: LANG=ru_RU.utf8, LC_CTYPE=ru_RU.utf8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)