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rtlwifi: Fix potential overflow on P2P code

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Nicolas Waisman noticed that even though noa_len is checked for
a compatible length it's still possible to overrun the buffers
of p2pinfo since there's no check on the upper bound of noa_num.
Bound noa_num against P2P_MAX_NOA_NUM.

Reported-by: Nicolas Waisman <nico@semmle.com>
Signed-off-by: Laura Abbott <labbott@redhat.com>
Acked-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
This commit is contained in:
Laura Abbott 2019-10-18 07:43:21 -04:00 committed by Kalle Valo
parent 7cded56583
commit 8c55dedb79
1 changed files with 6 additions and 0 deletions
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6
drivers/net/wireless/realtek/rtlwifi/ps.c
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@ -754,6 +754,9 @@ static void rtl_p2p_noa_ie(struct ieee80211_hw *hw, void *data,
return; return;
} else { } else {
noa_num = (noa_len - 2) / 13; noa_num = (noa_len - 2) / 13;
if (noa_num > P2P_MAX_NOA_NUM)
noa_num = P2P_MAX_NOA_NUM;
} }
noa_index = ie[3]; noa_index = ie[3];
if (rtlpriv->psc.p2p_ps_info.p2p_ps_mode == if (rtlpriv->psc.p2p_ps_info.p2p_ps_mode ==
@ -848,6 +851,9 @@ static void rtl_p2p_action_ie(struct ieee80211_hw *hw, void *data,
return; return;
} else { } else {
noa_num = (noa_len - 2) / 13; noa_num = (noa_len - 2) / 13;
if (noa_num > P2P_MAX_NOA_NUM)
noa_num = P2P_MAX_NOA_NUM;
} }
noa_index = ie[3]; noa_index = ie[3];
if (rtlpriv->psc.p2p_ps_info.p2p_ps_mode == if (rtlpriv->psc.p2p_ps_info.p2p_ps_mode ==