wifi: mac80211: check basic rates validity in sta_link_apply_parameters

When userspace sets supported rates for a new station via
NL80211_CMD_NEW_STATION, it might send a list that's empty
or contains only invalid values. Currently, we process these
values in sta_link_apply_parameters() without checking the result of
ieee80211_parse_bitrates(), which can lead to an empty rates bitmap.

A similar issue was addressed for NL80211_CMD_SET_BSS in commit
ce04abc3fcc6 ("wifi: mac80211: check basic rates validity").
This patch applies the same approach in sta_link_apply_parameters()
for NL80211_CMD_NEW_STATION, ensuring there is at least one valid
rate by inspecting the result of ieee80211_parse_bitrates().

Found by Linux Verification Center (linuxtesting.org) with Syzkaller.

Fixes: b95eb7f0eee4 ("wifi: cfg80211/mac80211: separate link params from station params")
Signed-off-by: Mikhail Lobanov <m.lobanov@rosa.ru>
Link: https://patch.msgid.link/20250317103139.17625-1-m.lobanov@rosa.ru
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index 211ad64..9f683f8 100644 (file)
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -1907,12 +1907,12 @@ static int sta_link_apply_parameters(struct ieee80211_local *local,
        }
 
        if (params->supported_rates &&
-           params->supported_rates_len) {
-               ieee80211_parse_bitrates(link->conf->chanreq.oper.width,
-                                        sband, params->supported_rates,
-                                        params->supported_rates_len,
-                                        &link_sta->pub->supp_rates[sband->band]);
-       }
+           params->supported_rates_len &&
+           !ieee80211_parse_bitrates(link->conf->chanreq.oper.width,
+                                     sband, params->supported_rates,
+                                     params->supported_rates_len,
+                                     &link_sta->pub->supp_rates[sband->band]))
+               return -EINVAL;
 
        if (params->ht_capa)
                ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,