devargs: fix crash with uninitialized parsing

[ upstream commit 356a2aa ]

The function rte_devargs_parse() previously was safe to call with
non-initialized devargs structure as parameter.

When adding the support for the global device syntax,
this assumption was broken.
Restore it by forcing memset as part of the call itself.

Bugzilla ID: 933
Fixes: b344eb5 ("devargs: parse global device syntax")

Signed-off-by: Madhuker Mythri <madhuker.mythri@oracle.com>
Signed-off-by: Gaetan Rivet <grive@u256.net>

lib/eal/common/eal_common_devargs.c

@@ -191,6 +191,7 @@ rte_devargs_parse(struct rte_devargs *da, const char *dev)
 
 	if (da == NULL)
 		return -EINVAL;
+	memset(da, 0, sizeof(*da));
 
 	/* First parse according global device syntax. */
 	if (rte_devargs_layers_parse(da, dev) == 0) {