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authorRandy Dunlap <rdunlap@infradead.org>2020-12-24 22:23:44 -0800
committerDavid S. Miller <davem@davemloft.net>2020-12-28 14:52:54 -0800
commitbd1248f1ddbc48b0c30565fce897a3b6423313b8 (patch)
treec08520951cacf6b5c2912d59a138662a68fcd962
parenta533b70a657c03137dd49cbcfee70aac086ab2b1 (diff)
downloadlinux-bd1248f1ddbc48b0c30565fce897a3b6423313b8.tar.bz2
net: sched: prevent invalid Scell_log shift count
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>
-rw-r--r--include/net/red.h4
-rw-r--r--net/sched/sch_choke.c2
-rw-r--r--net/sched/sch_gred.c2
-rw-r--r--net/sched/sch_red.c2
-rw-r--r--net/sched/sch_sfq.c2
5 files changed, 7 insertions, 5 deletions
diff --git a/include/net/red.h b/include/net/red.h
index fc455445f4b2..932f0d79d60c 100644
--- 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 bd618b00d319..50f680f03a54 100644
--- a/net/sched/sch_choke.c
+++ b/net/sched/sch_choke.c
@@ -362,7 +362,7 @@ 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 8599c6f31b05..e0bc77533acc 100644
--- a/net/sched/sch_gred.c
+++ b/net/sched/sch_gred.c
@@ -480,7 +480,7 @@ 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)) {
NL_SET_ERR_MSG_MOD(extack, "invalid RED parameters");
return -EINVAL;
}
diff --git a/net/sched/sch_red.c b/net/sched/sch_red.c
index e89fab6ccb34..b4ae34d7aa96 100644
--- a/net/sched/sch_red.c
+++ b/net/sched/sch_red.c
@@ -250,7 +250,7 @@ static int __red_change(struct Qdisc *sch, struct nlattr **tb,
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;
err = red_get_flags(ctl->flags, TC_RED_HISTORIC_FLAGS,
diff --git a/net/sched/sch_sfq.c b/net/sched/sch_sfq.c
index bca2be57d9fc..b25e51440623 100644
--- a/net/sched/sch_sfq.c
+++ b/net/sched/sch_sfq.c
@@ -647,7 +647,7 @@ 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);