6.6-stable review patch. If anyone has any objections, please let me know.
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From: Mikhail Lobanov m.lobanov@rosa.ru
commit 16ee3ea8faef8ff042acc15867a6c458c573de61 upstream.
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 Signed-off-by: "Hanne-Lotta Mäenpää" hannelotta@gmail.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- net/mac80211/cfg.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-)
--- a/net/mac80211/cfg.c +++ b/net/mac80211/cfg.c @@ -1847,12 +1847,12 @@ static int sta_link_apply_parameters(str }
if (params->supported_rates && - params->supported_rates_len) { - ieee80211_parse_bitrates(link->conf->chandef.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->chandef.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,