[PATCH] net/sched/sch_htb: clamp xstats tokens to fit into 32-bit int

From: Konstantin Khlebnikov
Date: Sat Jul 16 2016 - 10:09:20 EST

In kernel HTB keeps tokens in signed 64-bit in nanoseconds. In netlink
protocol these values are converted into pshed ticks (64ns for now) and
truncated to 32-bit. In struct tc_htb_xstats fields "tokens" and "ctokens"
are declared as unsigned 32-bit but they could be negative thus tool 'tc'
prints them as signed. Big values loose higher bits and/or become negative.

This patch clamps tokens in xstat into range from INT_MIN to INT_MAX.
In this way it's easier to understand what's going on here.

Signed-off-by: Konstantin Khlebnikov <khlebnikov@xxxxxxxxxxxxxx>
net/sched/sch_htb.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/net/sched/sch_htb.c b/net/sched/sch_htb.c
index 62f9d8100c6e..052f84d6cc23 100644
--- a/net/sched/sch_htb.c
+++ b/net/sched/sch_htb.c
@@ -1140,8 +1140,10 @@ htb_dump_class_stats(struct Qdisc *sch, unsigned long arg, struct gnet_dump *d)

if (!cl->level && cl->un.leaf.q)
qlen = cl->un.leaf.q->q.qlen;
- cl->xstats.tokens = PSCHED_NS2TICKS(cl->tokens);
- cl->xstats.ctokens = PSCHED_NS2TICKS(cl->ctokens);
+ cl->xstats.tokens = clamp_t(s64, PSCHED_NS2TICKS(cl->tokens),
+ cl->xstats.ctokens = clamp_t(s64, PSCHED_NS2TICKS(cl->ctokens),

if (gnet_stats_copy_basic(d, NULL, &cl->bstats) < 0 ||
gnet_stats_copy_rate_est(d, NULL, &cl->rate_est) < 0 ||