net_sched: Fix stack info leak in cbq_dump_wrr().

[ Upstream commit a0db856a95a29efb1c23db55c02d9f0ff4f0db48 ]

Make sure the reserved fields, and padding (if any), are
fully initialized.

Based upon a patch by Dan Carpenter and feedback from
Joe Perches.

Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/net/sched/sch_cbq.c b/net/sched/sch_cbq.c
index b7cddb9..7f59944 100644 (file)
--- a/net/sched/sch_cbq.c
+++ b/net/sched/sch_cbq.c
@@ -1467,6 +1467,7 @@ static int cbq_dump_wrr(struct sk_buff *skb, struct cbq_class *cl)
        unsigned char *b = skb_tail_pointer(skb);
        struct tc_cbq_wrropt opt;
 
+       memset(&opt, 0, sizeof(opt));
        opt.flags = 0;
        opt.allot = cl->allot;
        opt.priority = cl->priority + 1;