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During QA, Coverity tool detected several programming errors. A series of patches addressing them has been sent upstream for review:
http://marc.info/?l=linux-netdev&m=143886389810189&w=2

In addition to this, another commit from upstream should be backported:

commit d2055ea597e571bbbb6468b23b9c85de5ebf4591
Author: Eric Dumazet <eric.dumazet>
Date:   Fri May 29 04:04:05 2015 -0700

    ss: Fix allocation of cong control alg name

One of my submitted (and backported) patches was insufficient. I followed up with a real fix:
https://www.mail-archive.com/netdev@vger.kernel.org/msg74434.html

In addition, another commit needs to be backported to eliminate a compiler warning:

commit b765eda924363caec99b760d8cff815ecf4a8de6
Author: Nicolas Dichtel <nicolas.dichtel>
Date:   Wed Apr 22 10:27:06 2015 +0200

    libnamespaces: fix warning about syscall()
    
    The warning was:
    In file included from namespace.c:14:0:
    ../include/namespace.h: In function ‘setns’:
    ../include/namespace.h:37:2: warning: implicit declaration of function ‘syscall’ [-Wimplicit-function-declaration]
    
    Signed-off-by: Nicolas Dichtel <nicolas.dichtel>

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2015-2117.html