4.4-stable review patch. If anyone has any objections, please let me know.
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From: Nogah Frankel nogahf@mellanox.com
[ Upstream commit 8afa10cbe281b10371fee5a87ab266e48d71a7f9 ]
Check the qmin & qmax values doesn't overflow for the given Wlog value. Check that qmin <= qmax.
Fixes: a783474591f2 ("[PKT_SCHED]: Generic RED layer") Signed-off-by: Nogah Frankel nogahf@mellanox.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- include/net/red.h | 11 +++++++++++ net/sched/sch_choke.c | 3 +++ net/sched/sch_gred.c | 3 +++ net/sched/sch_red.c | 2 ++ net/sched/sch_sfq.c | 3 +++ 5 files changed, 22 insertions(+)
--- a/include/net/red.h +++ b/include/net/red.h @@ -167,6 +167,17 @@ static inline void red_set_vars(struct r 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) --- a/net/sched/sch_choke.c +++ b/net/sched/sch_choke.c @@ -438,6 +438,9 @@ static int choke_change(struct Qdisc *sc
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;
--- a/net/sched/sch_gred.c +++ b/net/sched/sch_gred.c @@ -389,6 +389,9 @@ static inline int gred_change_vq(struct 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; --- a/net/sched/sch_red.c +++ b/net/sched/sch_red.c @@ -199,6 +199,8 @@ static int red_change(struct Qdisc *sch, 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); --- a/net/sched/sch_sfq.c +++ b/net/sched/sch_sfq.c @@ -633,6 +633,9 @@ static int sfq_change(struct Qdisc *sch, 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)