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rtlwifi: check for array overflow

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This is merged by Ping-Ke Shih from commit dc33bd4309 ("staging:
rtlwifi: check for array overflow"), and the original commit log is
reserved below.

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>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
This commit is contained in:
Dan Carpenter 2017-12-29 16:31:03 +08:00 committed by Kalle Valo
parent f8dae08c6f
commit 5e0c1f0503
1 changed files with 4 additions and 0 deletions
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4
drivers/net/wireless/realtek/rtlwifi/base.c
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@ -1321,6 +1321,10 @@ 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);
tid = (capab &
IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;
if (tid >= MAX_TID_COUNT) {
rcu_read_unlock();
return true;
}
tid_data = &sta_entry->tids[tid];
if (tid_data->agg.rx_agg_state ==
RTL_RX_AGG_START)