linux-kernel - [PATCH 4.19 116/338] ath10k: fix memory overwrite of the WoWLAN wakeup packet pattern

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Message-Id: <20220414110842.209292883@linuxfoundation.org>
Date:   Thu, 14 Apr 2022 15:10:19 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Wen Gong <quic_wgong@...cinc.com>,
        Kalle Valo <quic_kvalo@...cinc.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 116/338] ath10k: fix memory overwrite of the WoWLAN wakeup packet pattern

From: Wen Gong <quic_wgong@...cinc.com>

[ Upstream commit e3fb3d4418fce5484dfe7995fcd94c18b10a431a ]

In function ath10k_wow_convert_8023_to_80211(), it will do memcpy for
the new->pattern, and currently the new->pattern and new->mask is same
with the old, then the memcpy of new->pattern will also overwrite the
old->pattern, because the header format of new->pattern is 802.11,
its length is larger than the old->pattern which is 802.3. Then the
operation of "Copy frame body" will copy a mistake value because the
body memory has been overwrite when memcpy the new->pattern.

Assign another empty value to new_pattern to avoid the overwrite issue.

Tested-on: QCA6174 hw3.2 SDIO WLAN.RMH.4.4.1-00049

Fixes: fa3440fa2fa1 ("ath10k: convert wow pattern from 802.3 to 802.11")
Signed-off-by: Wen Gong <quic_wgong@...cinc.com>
Signed-off-by: Kalle Valo <quic_kvalo@...cinc.com>
Link: https://lore.kernel.org/r/20211222031347.25463-1-quic_wgong@quicinc.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/wireless/ath/ath10k/wow.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/net/wireless/ath/ath10k/wow.c b/drivers/net/wireless/ath/ath10k/wow.c
index a6b179f88d36..1d44227d107d 100644
--- a/drivers/net/wireless/ath/ath10k/wow.c
+++ b/drivers/net/wireless/ath/ath10k/wow.c
@@ -235,14 +235,15 @@ static int ath10k_vif_wow_set_wakeups(struct ath10k_vif *arvif,
 			if (patterns[i].mask[j / 8] & BIT(j % 8))
 				bitmask[j] = 0xff;
 		old_pattern.mask = bitmask;
-		new_pattern = old_pattern;
 
 		if (ar->wmi.rx_decap_mode == ATH10K_HW_TXRX_NATIVE_WIFI) {
-			if (patterns[i].pkt_offset < ETH_HLEN)
+			if (patterns[i].pkt_offset < ETH_HLEN) {
 				ath10k_wow_convert_8023_to_80211(&new_pattern,
 								 &old_pattern);
-			else
+			} else {
+				new_pattern = old_pattern;
 				new_pattern.pkt_offset += WOW_HDR_LEN - ETH_HLEN;
+			}
 		}
 
 		if (WARN_ON(new_pattern.pattern_len > WOW_MAX_PATTERN_SIZE))
-- 
2.34.1