net: sched: prevent invalid Scell_log shift count

[ Upstream commit bd1248f1ddbc48b0c30565fce897a3b6423313b8 ]

Check Scell_log shift size in red_check_params() and modify all callers
of red_check_params() to pass Scell_log.

This prevents a shift out-of-bounds as detected by UBSAN:
  UBSAN: shift-out-of-bounds in ./include/net/red.h:252:22
  shift exponent 72 is too large for 32-bit type 'int'

Fixes: 8afa10cbe281 ("net_sched: red: Avoid illegal values")
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Reported-by: syzbot+97c5bd9cc81eca63d36e@syzkaller.appspotmail.com
Cc: Nogah Frankel <nogahf@mellanox.com>
Cc: Jamal Hadi Salim <jhs@mojatatu.com>
Cc: Cong Wang <xiyou.wangcong@gmail.com>
Cc: Jiri Pirko <jiri@resnulli.us>
Cc: netdev@vger.kernel.org
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/include/net/red.h b/include/net/red.h
index 9665582c4687e41bf5dd081894c0be89a40b89b6..e21e7fd4fe077af986682382d7cc855adee1cd50 100644 (file)
--- a/include/net/red.h
+++ b/include/net/red.h
@@ -168,12 +168,14 @@ 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)
+static inline bool red_check_params(u32 qth_min, u32 qth_max, u8 Wlog, u8 Scell_log)
 {
        if (fls(qth_min) + Wlog > 32)
                return false;
        if (fls(qth_max) + Wlog > 32)
                return false;
+       if (Scell_log >= 32)
+               return false;
        if (qth_max < qth_min)
                return false;
        return true;

diff --git a/net/sched/sch_choke.c b/net/sched/sch_choke.c
index 5a98618b47e86a49d865123931616197fc8b92d1..777475f7f29c42d34010be5bcd1592055885bccb 100644 (file)
--- a/net/sched/sch_choke.c
+++ b/net/sched/sch_choke.c
@@ -370,7 +370,7 @@ 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))
+       if (!red_check_params(ctl->qth_min, ctl->qth_max, ctl->Wlog, ctl->Scell_log))
                return -EINVAL;
 
        if (ctl->limit > CHOKE_MAX_QUEUE)

diff --git a/net/sched/sch_gred.c b/net/sched/sch_gred.c
index d3105ee8decfb0daf309ba07ac335e3df211880f..357dec26f2fdc023a82599515569a026d029749f 100644 (file)
--- a/net/sched/sch_gred.c
+++ b/net/sched/sch_gred.c
@@ -356,7 +356,7 @@ 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))
+       if (!red_check_params(ctl->qth_min, ctl->qth_max, ctl->Wlog, ctl->Scell_log))
                return -EINVAL;
 
        if (!q) {

diff --git a/net/sched/sch_red.c b/net/sched/sch_red.c
index c453b8d81c9e34483fa0842df29608e653181daa..6e6397bda49be7798f812323c8832ec00ebf0ae0 100644 (file)
--- a/net/sched/sch_red.c
+++ b/net/sched/sch_red.c
@@ -184,7 +184,7 @@ 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))
+       if (!red_check_params(ctl->qth_min, ctl->qth_max, ctl->Wlog, ctl->Scell_log))
                return -EINVAL;
 
        if (ctl->limit > 0) {

diff --git a/net/sched/sch_sfq.c b/net/sched/sch_sfq.c
index 1eae4de319b3d8e9c1b45d6ceff6b8f9342d97fe..2104fe7267e155c8a9a8f6e314d02384d3048431 100644 (file)
--- a/net/sched/sch_sfq.c
+++ b/net/sched/sch_sfq.c
@@ -649,7 +649,7 @@ static int sfq_change(struct Qdisc *sch, struct nlattr *opt)
        }
 
        if (ctl_v1 && !red_check_params(ctl_v1->qth_min, ctl_v1->qth_max,
-                                       ctl_v1->Wlog))
+                                       ctl_v1->Wlog, ctl_v1->Scell_log))
                return -EINVAL;
        if (ctl_v1 && ctl_v1->qth_min) {
                p = kmalloc(sizeof(*p), GFP_KERNEL);