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wifi: nl80211: disallow setting special AP channel widths

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Setting the AP channel width is meant for use with the normal
20/40/... MHz channel width progression, and switching around
in S1G or narrow channels isn't supported. Disallow that.

Reported-by: syzbot+bc0f5b92cc7091f45fb6@syzkaller.appspotmail.com
Link: https://msgid.link/20240515141600.d4a9590bfe32.I19a32d60097e81b527eafe6b0924f6c5fbb2dc45@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Johannes Berg 2024-05-15 14:16:00 +02:00
parent 9d222c1283
commit 23daf1b4c9
1 changed files with 27 additions and 0 deletions
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27
net/wireless/nl80211.c
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@ -3415,6 +3415,33 @@ static int __nl80211_set_channel(struct cfg80211_registered_device *rdev,
if (chandef.chan != cur_chan)
return -EBUSY;
/* only allow this for regular channel widths */
switch (wdev->links[link_id].ap.chandef.width) {
case NL80211_CHAN_WIDTH_20_NOHT:
case NL80211_CHAN_WIDTH_20:
case NL80211_CHAN_WIDTH_40:
case NL80211_CHAN_WIDTH_80:
case NL80211_CHAN_WIDTH_80P80:
case NL80211_CHAN_WIDTH_160:
case NL80211_CHAN_WIDTH_320:
break;
default:
return -EINVAL;
}
switch (chandef.width) {
case NL80211_CHAN_WIDTH_20_NOHT:
case NL80211_CHAN_WIDTH_20:
case NL80211_CHAN_WIDTH_40:
case NL80211_CHAN_WIDTH_80:
case NL80211_CHAN_WIDTH_80P80:
case NL80211_CHAN_WIDTH_160:
case NL80211_CHAN_WIDTH_320:
break;
default:
return -EINVAL;
}
result = rdev_set_ap_chanwidth(rdev, dev, link_id,
&chandef);
if (result)