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staging: rtlwifi: check for array overflow

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Smatch is distrustful of the "capab" value and marks it as user
controlled.  I think it actually comes from the firmware?  Anyway, I
looked at other drivers and they added a bounds check and it seems like
a harmless thing to have so I have added it here as well.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Dan Carpenter 2017-08-24 13:08:32 +03:00 committed by Greg Kroah-Hartman
parent cec8bb22fb
commit dc33bd4309
1 changed files with 4 additions and 0 deletions
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4
drivers/staging/rtlwifi/base.c
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@ -1414,6 +1414,10 @@ bool rtl_action_proc(struct ieee80211_hw *hw, struct sk_buff *skb, u8 is_tx)
le16_to_cpu(mgmt->u.action.u.addba_req.capab); le16_to_cpu(mgmt->u.action.u.addba_req.capab);
tid = (capab & tid = (capab &
IEEE80211_ADDBA_PARAM_TID_MASK) >> 2; IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;
if (tid >= MAX_TID_COUNT) {
rcu_read_unlock();
return true;
}
tid_data = &sta_entry->tids[tid]; tid_data = &sta_entry->tids[tid];
if (tid_data->agg.rx_agg_state == if (tid_data->agg.rx_agg_state ==
RTL_RX_AGG_START) RTL_RX_AGG_START)