From mboxrd@z Thu Jan  1 00:00:00 1970
From: bugzilla@dpdk.org
Subject: [Bug 20] Undefined behavior caused by NUMA function in
	eal_memory
Date: Sun, 01 Apr 2018 12:30:07 +0000
Message-ID: <bug-20-3@http.dpdk.org/tracker/>
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https://dpdk.org/tracker/show_bug.cgi?id=3D20

            Bug ID: 20
           Summary: Undefined behavior caused by NUMA function in
                    eal_memory
           Product: DPDK
           Version: unspecified
          Hardware: All
                OS: Linux
            Status: CONFIRMED
          Severity: normal
          Priority: Normal
         Component: core
          Assignee: dev@dpdk.org
          Reporter: solal.pirelli@gmail.com
  Target Milestone: ---

In linuxapp's eal_memory.c, the map_all_hugepages function begins by declar=
ing
and initializing variables, including a nodemask
(http://dpdk.org/browse/dpdk/tree/lib/librte_eal/linuxapp/eal/eal_memory.c?=
h=3Dv18.02#n344).

However, this initialization occurs before the numa_available function is
called. According to the libnuma documentation
(https://linux.die.net/man/3/numa), all other functions have undefined beha=
vior
if numa_available returns -1.

The initialization of the nodemask needs to be moved after the numa_availab=
le
call, and consequently its freeing at the end of the function needs to be
conditional on it not being NULL.

--=20
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