wifi: cfg80211: validate PMSR FTM preamble range

PMSR FTM request parsing accepts preamble values outside the
enumerated nl80211 preamble range.

Reject out-of-range values before using them in the parser capability
bit test using the policy.

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>
Link: https://patch.msgid.link/20260612133703.93274-2-enderaoelyther@gmail.com
[drop unnecessary check]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 3e05db942a18b876dda9f7c2e536019ef86b7cef..625c99cf70a3e281e007f3f97aebf90ef8f80ff9 100644 (file)
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -461,7 +461,9 @@ nl80211_ftm_responder_policy[NL80211_FTM_RESP_ATTR_MAX + 1] = {
 static const struct nla_policy
 nl80211_pmsr_ftm_req_attr_policy[NL80211_PMSR_FTM_REQ_ATTR_MAX + 1] = {
        [NL80211_PMSR_FTM_REQ_ATTR_ASAP] = { .type = NLA_FLAG },
-       [NL80211_PMSR_FTM_REQ_ATTR_PREAMBLE] = { .type = NLA_U32 },
+       [NL80211_PMSR_FTM_REQ_ATTR_PREAMBLE] =
+               NLA_POLICY_RANGE(NLA_U32, NL80211_PREAMBLE_LEGACY,
+                                NL80211_PREAMBLE_HE),
        [NL80211_PMSR_FTM_REQ_ATTR_NUM_BURSTS_EXP] =
                NLA_POLICY_MAX(NLA_U8, 15),
        [NL80211_PMSR_FTM_REQ_ATTR_BURST_PERIOD] = { .type = NLA_U16 },