linux-kernel - [PATCH] ath12k: fix memcpy array overflow in ath12k_peer_assoc_h

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Date:   Mon,  3 Jul 2023 14:37:29 +0200
From:   Arnd Bergmann <arnd@...nel.org>
To:     Kalle Valo <kvalo@...nel.org>,
        Jeff Johnson <quic_jjohnson@...cinc.com>,
        Balamurugan Selvarajan <quic_bselvara@...cinc.com>,
        P Praneesh <quic_ppranees@...cinc.com>,
        Baochen Qiang <quic_bqiang@...cinc.com>,
        Karthikeyan Periyasamy <quic_periyasa@...cinc.com>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Ramya Gnanasekar <quic_rgnanase@...cinc.com>,
        Wen Gong <quic_wgong@...cinc.com>,
        Karthik M <quic_karm@...cinc.com>,
        Aditya Kumar Singh <quic_adisi@...cinc.com>,
        Aishwarya R <quic_aisr@...cinc.com>,
        Carl Huang <quic_cjhuang@...cinc.com>,
        ath12k@...ts.infradead.org, linux-wireless@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] ath12k: fix memcpy array overflow in ath12k_peer_assoc_h_he

From: Arnd Bergmann <arnd@...db.de>

Two memory copies in this function copy from a short array into a longer one,
using the wrong size, which leads to an out-of-bounds access:

include/linux/fortify-string.h:592:4: error: call to '__read_overflow2_field' declared with 'warning' attribute: detected read beyond size of field (2nd parameter); maybe use struct_group()? [-Werror,-Wattribute-warning]
                        __read_overflow2_field(q_size_field, size);
                        ^
include/linux/fortify-string.h:592:4: error: call to '__read_overflow2_field' declared with 'warning' attribute: detected read beyond size of field (2nd parameter); maybe use struct_group()? [-Werror,-Wattribute-warning]
2 errors generated.

Fixes: d889913205cf7 ("wifi: ath12k: driver for Qualcomm Wi-Fi 7 devices")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/net/wireless/ath/ath12k/mac.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/ath/ath12k/mac.c b/drivers/net/wireless/ath/ath12k/mac.c
index f5ebebe806e0d..b8a8d33cc4187 100644
--- a/drivers/net/wireless/ath/ath12k/mac.c
+++ b/drivers/net/wireless/ath/ath12k/mac.c
@@ -1637,9 +1637,9 @@ static void ath12k_peer_assoc_h_he(struct ath12k *ar,
 	arg->peer_nss = min(sta->deflink.rx_nss, max_nss);
 
 	memcpy(&arg->peer_he_cap_macinfo, he_cap->he_cap_elem.mac_cap_info,
-	       sizeof(arg->peer_he_cap_macinfo));
+	       sizeof(he_cap->he_cap_elem.mac_cap_info));
 	memcpy(&arg->peer_he_cap_phyinfo, he_cap->he_cap_elem.phy_cap_info,
-	       sizeof(arg->peer_he_cap_phyinfo));
+	       sizeof(he_cap->he_cap_elem.phy_cap_info));
 	arg->peer_he_ops = vif->bss_conf.he_oper.params;
 
 	/* the top most byte is used to indicate BSS color info */
-- 
2.39.2