From: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Date: Wed, 30 Aug 2017 12:49:02 +0300
Subject: sch_fq_codel: avoid double free on init failure
Patch-mainline: v4.13
Git-commit: 30c31d746d0eb458ae327f522bc8e4c44cbea0f0
References: bsc#1056787
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>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
net/sched/sch_fq_codel.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)
--- 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 *s
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;