sch_fq_codel: avoid double free on init failure

It is very unlikely to happen but the backlogs memory allocation
could fail and will free q->flows, but then ->destroy() will free
q->flows too. For correctness remove the first free and let ->destroy
clean up.

Fixes: 87b60cfacf9f ("net_sched: fix error recovery at qdisc creation")
Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/sched/sch_fq_codel.c b/net/sched/sch_fq_codel.c
index 337f2d6d81e42e278b63443d904955e2c6692f03..2c0c05f2cc34a9de51390c45f29dd8db810075c7 100644 (file)
--- a/net/sched/sch_fq_codel.c
+++ b/net/sched/sch_fq_codel.c
@@ -491,10 +491,8 @@ static int fq_codel_init(struct Qdisc *sch, struct nlattr *opt)
                if (!q->flows)
                        return -ENOMEM;
                q->backlogs = kvzalloc(q->flows_cnt * sizeof(u32), GFP_KERNEL);
-               if (!q->backlogs) {
-                       kvfree(q->flows);
+               if (!q->backlogs)
                        return -ENOMEM;
-               }
                for (i = 0; i < q->flows_cnt; i++) {
                        struct fq_codel_flow *flow = q->flows + i;