rtlwifi: Fix potential overflow on P2P code

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.

Bug: 142967706
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: I90a9b285feb50b6b5c30e242756d47848902b634

diff --git a/drivers/net/wireless/realtek/rtlwifi/ps.c b/drivers/net/wireless/realtek/rtlwifi/ps.c
index f6d00613c53d9f1a5bfcb332f82cb4b9a27c0cf5..e1297809535f907bae220a7344679cd819a34d2f 100644 (file)
--- 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 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 ==
@@ -868,6 +871,9 @@ 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 ==