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nl80211: don't crash sending invalid chandef

Browse source 
One of the cases for an invalid channel definition is that
the channel pointer is NULL, in which case the warning is
a bit late since we'll dereference the pointer. Bail out
of the function upon warning about this.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Johannes Berg 2014-11-27 17:26:56 +01:00
parent 98f0334263
commit 601555cd75
1 changed files with 2 additions and 1 deletions
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3
net/wireless/nl80211.c
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@ -2317,7 +2317,8 @@ static inline u64 wdev_id(struct wireless_dev *wdev)
static int nl80211_send_chandef(struct sk_buff *msg,
const struct cfg80211_chan_def *chandef)
{
WARN_ON(!cfg80211_chandef_valid(chandef));
if (WARN_ON(!cfg80211_chandef_valid(chandef)))
return -EINVAL;
if (nla_put_u32(msg, NL80211_ATTR_WIPHY_FREQ,
chandef->chan->center_freq))