[PATCH] nftables: segfault in top scope define

[Phil Oester <kernel@xxxxxxxxxxxx>]

Nftables segfaults if a symbol is added in top_scope, because of a missing
init_list_head.  Trivial example:

    define ip_set = {192.168.1.2, 192.168.2.3}
    add rule filter output ip daddr $ip_set counter

This closes netfilter bugzilla #877.

Reported-by: Anandraj M <anandrm@xxxxxxxxx>
Signed-off-by: Phil Oester <kernel@xxxxxxxxxxxx>

diff --git a/src/parser.y b/src/parser.y
index a49e5c2..c6f8c9d 100644
--- a/src/parser.y
+++ b/src/parser.y
@@ -32,6 +32,7 @@ void parser_init(struct parser_state *state, struct list_head *msgs)
 {
 	memset(state, 0, sizeof(*state));
 	init_list_head(&state->cmds);
+	init_list_head(&state->top_scope.symbols);
 	state->msgs = msgs;
 	state->scopes[0] = scope_init(&state->top_scope, NULL);
 }