[PATCH] wifi: cfg80211: validate PMSR measurement type data

[Zhao Li <enderaoelyther@gmail.com>]

PMSR request parsing accepts missing or duplicated measurement type
entries in NL80211_PMSR_REQ_ATTR_DATA.

Track whether one measurement type was already provided, reject a
second one immediately, and return an error if the request data block
contains no measurement type at all.

Fixes: 9bb7e0f24e7e7 ("cfg80211: add peer measurement with FTM initiator API")
Assisted-by: Codex:gpt-5.5
Assisted-by: Claude:claude-opus-4.8
Signed-off-by: Zhao Li <enderaoelyther@gmail.com>
---
 net/wireless/pmsr.c | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

diff --git a/net/wireless/pmsr.c b/net/wireless/pmsr.c
index d6cd0de64d1f8..b1ead4adf9690 100644
--- a/net/wireless/pmsr.c
+++ b/net/wireless/pmsr.c
@@ -213,6 +213,7 @@ static int pmsr_parse_peer(struct cfg80211_registered_device *rdev,
 	struct nlattr *tb[NL80211_PMSR_PEER_ATTR_MAX + 1];
 	struct nlattr *req[NL80211_PMSR_REQ_ATTR_MAX + 1];
 	struct nlattr *treq;
+	bool have_measurement_type = false;
 	int err, rem;
 
 	/* no validation needed - was already done via nested policy */
@@ -265,6 +266,14 @@ static int pmsr_parse_peer(struct cfg80211_registered_device *rdev,
 	}
 
 	nla_for_each_nested(treq, req[NL80211_PMSR_REQ_ATTR_DATA], rem) {
+		if (have_measurement_type) {
+			NL_SET_ERR_MSG_ATTR(info->extack, treq,
+					    "multiple measurement types in request data");
+			return -EINVAL;
+		}
+
+		have_measurement_type = true;
+
 		switch (nla_type(treq)) {
 		case NL80211_PMSR_TYPE_FTM:
 			err = pmsr_parse_ftm(rdev, treq, out, info);
@@ -274,10 +283,16 @@ static int pmsr_parse_peer(struct cfg80211_registered_device *rdev,
 					    "unsupported measurement type");
 			err = -EINVAL;
 		}
+		if (err)
+			return err;
 	}
 
-	if (err)
-		return err;
+	if (!have_measurement_type) {
+		NL_SET_ERR_MSG_ATTR(info->extack,
+				    req[NL80211_PMSR_REQ_ATTR_DATA],
+				    "missing measurement type in request data");
+		return -EINVAL;
+	}
 
 	return 0;
 }
-- 
2.50.1 (Apple Git-155)