From: Mikhail Lobanov m.lobanov@rosa.ru

[ Upstream commit 16ee3ea8faef8ff042acc15867a6c458c573de61 ]

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.

[ Summary of conflict resolutions: - The function ieee80211_parse_bitrates() takes channel width as its first parameter, and the chandef struct has been refactored in kernel version 6.9, in commit 6092077ad09ce880c61735c314060f0bd79ae4aa so that the width is contained in chanreq.oper.width. In kernel version 6.6 the width parameter is defined directly in the chandef struct. ]

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 --- net/mac80211/cfg.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c index 3ff7f38394a6..1addfba4b285 100644 --- a/net/mac80211/cfg.c +++ b/net/mac80211/cfg.c @@ -1847,12 +1847,12 @@ static int sta_link_apply_parameters(struct ieee80211_local *local, }

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,