[PATCH net] net/sched: mqprio: fix stack out-of-bounds write in tc entry parsing

[Maher Azzouzi]

From: MaherAzzouzi <maherazz04@xxxxxxxxx>

TCA_MQPRIO_TC_ENTRY_INDEX is validated using
NLA_POLICY_MAX(NLA_U32, TC_QOPT_MAX_QUEUE), which allows the value
TC_QOPT_MAX_QUEUE (16). This leads to a 4-byte out-of-bounds stack write in
the fp[] array, which only has room for 16 elements (0–15).

Fix this by changing the policy to allow only up to TC_QOPT_MAX_QUEUE - 1.

Fixes: f62af20bed2d ("net/sched: mqprio: allow per-TC user input of FP adminStatus")
Reported-by: Maher Azzouzi <maherazz04@xxxxxxxxx>
Signed-off-by: Maher Azzouzi <maherazz04@xxxxxxxxx>
---
 net/sched/sch_mqprio.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/sched/sch_mqprio.c b/net/sched/sch_mqprio.c
index 51d4013b6121..f3e5ef9a9592 100644
--- a/net/sched/sch_mqprio.c
+++ b/net/sched/sch_mqprio.c
@@ -152,7 +152,7 @@ static int mqprio_parse_opt(struct net_device *dev, struct tc_mqprio_qopt *qopt,
 static const struct
 nla_policy mqprio_tc_entry_policy[TCA_MQPRIO_TC_ENTRY_MAX + 1] = {
 	[TCA_MQPRIO_TC_ENTRY_INDEX]	= NLA_POLICY_MAX(NLA_U32,
-							 TC_QOPT_MAX_QUEUE),
+							 TC_QOPT_MAX_QUEUE - 1),
 	[TCA_MQPRIO_TC_ENTRY_FP]	= NLA_POLICY_RANGE(NLA_U32,
 							   TC_FP_EXPRESS,
 							   TC_FP_PREEMPTIBLE),
-- 
2.34.1