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net_sched: red: Avoid illegal values 

Check the qmin & qmax values doesn't overflow for the given Wlog value.
Check that qmin <= qmax.

Fixes: a783474591 ("[PKT_SCHED]: Generic RED layer")
Signed-off-by: Nogah Frankel <nogahf@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Nogah Frankel 2017-12-04 13:31:11 +02:00 committed by David S. Miller
parent 5c47220342
commit 8afa10cbe2
5 changed files with 22 additions and 0 deletions
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11
include/net/red.h
View File

@ -168,6 +168,17 @@ static inline void red_set_vars(struct red_vars *v)
v->qcount = -1;
}
static inline bool red_check_params(u32 qth_min, u32 qth_max, u8 Wlog)
{
if (fls(qth_min) + Wlog > 32)
return false;
if (fls(qth_max) + Wlog > 32)
return false;
if (qth_max < qth_min)
return false;
return true;
}
static inline void red_set_parms(struct red_parms *p,
u32 qth_min, u32 qth_max, u8 Wlog, u8 Plog,
u8 Scell_log, u8 *stab, u32 max_P)

3
net/sched/sch_choke.c
View File

@ -369,6 +369,9 @@ static int choke_change(struct Qdisc *sch, struct nlattr *opt)
ctl = nla_data(tb[TCA_CHOKE_PARMS]);
if (!red_check_params(ctl->qth_min, ctl->qth_max, ctl->Wlog))
return -EINVAL;
if (ctl->limit > CHOKE_MAX_QUEUE)
return -EINVAL;

3
net/sched/sch_gred.c
View File

@ -356,6 +356,9 @@ static inline int gred_change_vq(struct Qdisc *sch, int dp,
struct gred_sched *table = qdisc_priv(sch);
struct gred_sched_data *q = table->tab[dp];
if (!red_check_params(ctl->qth_min, ctl->qth_max, ctl->Wlog))
return -EINVAL;
if (!q) {
table->tab[dp] = q = *prealloc;
*prealloc = NULL;

2
net/sched/sch_red.c
View File

@ -212,6 +212,8 @@ static int red_change(struct Qdisc *sch, struct nlattr *opt)
max_P = tb[TCA_RED_MAX_P] ? nla_get_u32(tb[TCA_RED_MAX_P]) : 0;
ctl = nla_data(tb[TCA_RED_PARMS]);
if (!red_check_params(ctl->qth_min, ctl->qth_max, ctl->Wlog))
return -EINVAL;
if (ctl->limit > 0) {
child = fifo_create_dflt(sch, &bfifo_qdisc_ops, ctl->limit);

3
net/sched/sch_sfq.c
View File

@ -639,6 +639,9 @@ static int sfq_change(struct Qdisc *sch, struct nlattr *opt)
if (ctl->divisor &&
(!is_power_of_2(ctl->divisor) || ctl->divisor > 65536))
return -EINVAL;
if (ctl_v1 && !red_check_params(ctl_v1->qth_min, ctl_v1->qth_max,
ctl_v1->Wlog))
return -EINVAL;
if (ctl_v1 && ctl_v1->qth_min) {
p = kmalloc(sizeof(*p), GFP_KERNEL);
if (!p)