linux-kernel - [PATCH] wireless: ath: work around false-positive stringop-overread warning

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Message-Id: <20230417205447.1800912-1-arnd@kernel.org>
Date:   Mon, 17 Apr 2023 22:54:20 +0200
From:   Arnd Bergmann <arnd@...nel.org>
To:     Kalle Valo <kvalo@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Johannes Berg <johannes.berg@...el.com>,
        Manikanta Pubbisetty <quic_mpubbise@...cinc.com>,
        Wen Gong <quic_wgong@...cinc.com>,
        Baochen Qiang <quic_bqiang@...cinc.com>,
        Sowmiya Sree Elavalagan <quic_ssreeela@...cinc.com>,
        ath11k@...ts.infradead.org, linux-wireless@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        ath12k@...ts.infradead.org
Subject: [PATCH] wireless: ath: work around false-positive stringop-overread warning

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

In a rare arm64 randconfig build, I got multiple warnings for ath11k
and ath12k:

In function 'ath11k_peer_assoc_h_ht',
    inlined from 'ath11k_peer_assoc_prepare' at drivers/net/wireless/ath/ath11k/mac.c:2665:2:
drivers/net/wireless/ath/ath11k/mac.c:1709:13: error: 'ath11k_peer_assoc_h_ht_masked' reading 10 bytes from a region of size 0 [-Werror=stringop-overread]
 1709 |         if (ath11k_peer_assoc_h_ht_masked(ht_mcs_mask))
      |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

This happens whenever gcc-13 fails to inline one of the functions
that take a fixed-length array argument but gets passed a pointer.

Change these functions to all take a regular pointer argument
instead.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/net/wireless/ath/ath11k/mac.c | 12 ++++++------
 drivers/net/wireless/ath/ath12k/mac.c |  8 ++++----
 2 files changed, 10 insertions(+), 10 deletions(-)

diff --git a/drivers/net/wireless/ath/ath11k/mac.c b/drivers/net/wireless/ath/ath11k/mac.c
index cad832e0e6b8..393669be7847 100644
--- a/drivers/net/wireless/ath/ath11k/mac.c
+++ b/drivers/net/wireless/ath/ath11k/mac.c
@@ -433,7 +433,7 @@ u8 ath11k_mac_bitrate_to_idx(const struct ieee80211_supported_band *sband,
 }
 
 static u32
-ath11k_mac_max_ht_nss(const u8 ht_mcs_mask[IEEE80211_HT_MCS_MASK_LEN])
+ath11k_mac_max_ht_nss(const u8 *ht_mcs_mask)
 {
 	int nss;
 
@@ -445,7 +445,7 @@ ath11k_mac_max_ht_nss(const u8 ht_mcs_mask[IEEE80211_HT_MCS_MASK_LEN])
 }
 
 static u32
-ath11k_mac_max_vht_nss(const u16 vht_mcs_mask[NL80211_VHT_NSS_MAX])
+ath11k_mac_max_vht_nss(const u16 *vht_mcs_mask)
 {
 	int nss;
 
@@ -457,7 +457,7 @@ ath11k_mac_max_vht_nss(const u16 vht_mcs_mask[NL80211_VHT_NSS_MAX])
 }
 
 static u32
-ath11k_mac_max_he_nss(const u16 he_mcs_mask[NL80211_HE_NSS_MAX])
+ath11k_mac_max_he_nss(const u16 *he_mcs_mask)
 {
 	int nss;
 
@@ -1658,7 +1658,7 @@ static void ath11k_peer_assoc_h_rates(struct ath11k *ar,
 }
 
 static bool
-ath11k_peer_assoc_h_ht_masked(const u8 ht_mcs_mask[IEEE80211_HT_MCS_MASK_LEN])
+ath11k_peer_assoc_h_ht_masked(const u8 *ht_mcs_mask)
 {
 	int nss;
 
@@ -1670,7 +1670,7 @@ ath11k_peer_assoc_h_ht_masked(const u8 ht_mcs_mask[IEEE80211_HT_MCS_MASK_LEN])
 }
 
 static bool
-ath11k_peer_assoc_h_vht_masked(const u16 vht_mcs_mask[])
+ath11k_peer_assoc_h_vht_masked(const u16 *vht_mcs_mask)
 {
 	int nss;
 
@@ -2065,7 +2065,7 @@ static u16 ath11k_peer_assoc_h_he_limit(u16 tx_mcs_set,
 }
 
 static bool
-ath11k_peer_assoc_h_he_masked(const u16 he_mcs_mask[NL80211_HE_NSS_MAX])
+ath11k_peer_assoc_h_he_masked(const u16 *he_mcs_mask)
 {
 	int nss;
 
diff --git a/drivers/net/wireless/ath/ath12k/mac.c b/drivers/net/wireless/ath/ath12k/mac.c
index d683a0668989..ea2313b6b759 100644
--- a/drivers/net/wireless/ath/ath12k/mac.c
+++ b/drivers/net/wireless/ath/ath12k/mac.c
@@ -381,7 +381,7 @@ u8 ath12k_mac_bitrate_to_idx(const struct ieee80211_supported_band *sband,
 }
 
 static u32
-ath12k_mac_max_ht_nss(const u8 ht_mcs_mask[IEEE80211_HT_MCS_MASK_LEN])
+ath12k_mac_max_ht_nss(const u8 *ht_mcs_mask)
 {
 	int nss;
 
@@ -393,7 +393,7 @@ ath12k_mac_max_ht_nss(const u8 ht_mcs_mask[IEEE80211_HT_MCS_MASK_LEN])
 }
 
 static u32
-ath12k_mac_max_vht_nss(const u16 vht_mcs_mask[NL80211_VHT_NSS_MAX])
+ath12k_mac_max_vht_nss(const u16 *vht_mcs_mask)
 {
 	int nss;
 
@@ -1303,7 +1303,7 @@ static void ath12k_peer_assoc_h_rates(struct ath12k *ar,
 }
 
 static bool
-ath12k_peer_assoc_h_ht_masked(const u8 ht_mcs_mask[IEEE80211_HT_MCS_MASK_LEN])
+ath12k_peer_assoc_h_ht_masked(const u8 *ht_mcs_mask)
 {
 	int nss;
 
@@ -1315,7 +1315,7 @@ ath12k_peer_assoc_h_ht_masked(const u8 ht_mcs_mask[IEEE80211_HT_MCS_MASK_LEN])
 }
 
 static bool
-ath12k_peer_assoc_h_vht_masked(const u16 vht_mcs_mask[NL80211_VHT_NSS_MAX])
+ath12k_peer_assoc_h_vht_masked(const u16 *vht_mcs_mask)
 {
 	int nss;
 
-- 
2.39.2