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wifi: cfg80211: wext: validate chandef in monitor mode

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cfg80211_wext_siwfreq() constructs a channel definition for monitor
mode but passes it to cfg80211_set_monitor_channel() without first
validating it with cfg80211_chandef_valid(). This causes a WARN_ON
in cfg80211_chandef_dfs_required() when it receives an invalid chandef.

Add the missing cfg80211_chandef_valid() check before calling
cfg80211_set_monitor_channel() to return -EINVAL early on invalid
channel definitions, consistent with how other callers handle this.

Reported-by: syzbot+02a1a03b8622d3c7d1c9@syzkaller.appspotmail.com
Signed-off-by: Kartik Nair <contact.kartikn@gmail.com>
Link: https://patch.msgid.link/20260510202437.7857-1-contact.kartikn@gmail.com
[clarify subject]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Kartik Nair 2026-05-11 01:54:37 +05:30 committed by Johannes Berg
parent 8499d0949d
commit dc14686f27
1 changed files with 2 additions and 0 deletions
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2
net/wireless/wext-compat.c
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@ -789,6 +789,8 @@ static int cfg80211_wext_siwfreq(struct net_device *dev,
chandef.chan = ieee80211_get_channel(&rdev->wiphy, freq);
if (!chandef.chan)
return -EINVAL;
if (!cfg80211_chandef_valid(&chandef))
return -EINVAL;
return cfg80211_set_monitor_channel(rdev, dev, &chandef);
case NL80211_IFTYPE_MESH_POINT:
freq = cfg80211_wext_freq(wextfreq);