| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.14 82/95] rtlwifi: Fix potential overflow on P2P code | Date | Mon, 4 Nov 2019 22:45:20 +0100 |
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From: Laura Abbott <labbott@redhat.com>
commit 8c55dedb795be8ec0cf488f98c03a1c2176f7fb1 upstream.
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> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- drivers/net/wireless/realtek/rtlwifi/ps.c | 6 ++++++ 1 file changed, 6 insertions(+)
--- a/drivers/net/wireless/realtek/rtlwifi/ps.c +++ b/drivers/net/wireless/realtek/rtlwifi/ps.c @@ -774,6 +774,9 @@ static void rtl_p2p_noa_ie(struct ieee80 return; } else { noa_num = (noa_len - 2) / 13; + if (noa_num > P2P_MAX_NOA_NUM) + noa_num = P2P_MAX_NOA_NUM; + } noa_index = ie[3]; if (rtlpriv->psc.p2p_ps_info.p2p_ps_mode == @@ -868,6 +871,9 @@ static void rtl_p2p_action_ie(struct iee return; } else { noa_num = (noa_len - 2) / 13; + if (noa_num > P2P_MAX_NOA_NUM) + noa_num = P2P_MAX_NOA_NUM; + } noa_index = ie[3]; if (rtlpriv->psc.p2p_ps_info.p2p_ps_mode ==
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