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 --- This fix is applied to most of stable kernel excepting to 3.16 due to directory change on kernel 4.4. So, I compose this patch with old directory for stable kernel 3.16. --- drivers/net/wireless/rtlwifi/ps.c | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/drivers/net/wireless/rtlwifi/ps.c b/drivers/net/wireless/rtlwifi/ps.c index 50504942ded1..bfe097b224ad 100644 --- a/drivers/net/wireless/rtlwifi/ps.c +++ b/drivers/net/wireless/rtlwifi/ps.c @@ -801,6 +801,9 @@ static void rtl_p2p_noa_ie(struct ieee80211_hw *hw, void *data, 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 == @@ -895,6 +898,9 @@ static void rtl_p2p_action_ie(struct ieee80211_hw *hw, void *data, 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 ==