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nl80211: fix null-ptr dereference on invalid mesh configuration 

If TX rates are specified during mesh join, the channel must
also be specified. Check the channel pointer to avoid a null
pointer dereference if it isn't.

Reported-by: Jouni Malinen <j@w1.fi>
Fixes: 8564e38206 ("cfg80211: add checks for beacon rate, extend to mesh")
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Johannes Berg 2017-09-18 22:46:36 +02:00
parent e785fa0a16
commit 265698d7e6
1 changed files with 3 additions and 0 deletions
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3
net/wireless/nl80211.c
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@ -9987,6 +9987,9 @@ static int nl80211_join_mesh(struct sk_buff *skb, struct genl_info *info)
if (err)
return err;
if (!setup.chandef.chan)
return -EINVAL;
err = validate_beacon_tx_rate(rdev, setup.chandef.chan->band,
&setup.beacon_rate);
if (err)