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Wed, 05 Aug 2026 01:26:47 -0700 (PDT) From: Zhan Xusheng X-Google-Original-From: Zhan Xusheng To: Miri Korenblit , linux-wireless@vger.kernel.org Cc: Johannes Berg , Richard Cochran , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, zhanxusheng@xiaomi.com Subject: [PATCH 1/2] wifi: iwlwifi: mvm: Fix GP2 to nanoseconds overflow on 32-bit Date: Wed, 5 Aug 2026 16:25:14 +0800 Message-ID: <20260805082515.4136842-2-zhanxusheng@xiaomi.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260805082515.4136842-1-zhanxusheng@xiaomi.com> References: <20260805082515.4136842-1-zhanxusheng@xiaomi.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" GP2 is a free-running 32-bit microsecond hardware counter. The PTP code converts a u32 GP2 value to nanoseconds as: gp2 * NSEC_PER_USEC NSEC_PER_USEC is a plain 'long' (1000L), so on 32-bit builds this multiplication is evaluated in 32-bit arithmetic and overflows once the GP2 value exceeds ~4.29 million microseconds (~4.3 s). GP2 wraps only every 2^32 microseconds (~71.5 min), so the product is truncated for almost the entire counter range, producing bogus PTP timestamps. Neighbouring conversions already cast to u64 first (e.g. (u64)gp2 * NSEC_PER_USEC); these sites just missed the cast. Cast to u64 so the multiplication is performed in 64-bit, matching the existing call sites. 64-bit builds are unaffected. Fixes: a2f49f7d52a9 ("wifi: iwlwifi: mvm: implement PHC clock adjustments") Fixes: 0e49e940d1bc ("wifi: iwlwifi: mvm: add an option to use ptp clock fo= r rx timestamp") Signed-off-by: Zhan Xusheng --- drivers/net/wireless/intel/iwlwifi/mvm/ptp.c | 4 ++-- drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c | 4 ++-- 2 files changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/ptp.c b/drivers/net/wir= eless/intel/iwlwifi/mvm/ptp.c index 49dcb1388007..5f33e2f8fb2a 100644 --- a/drivers/net/wireless/intel/iwlwifi/mvm/ptp.c +++ b/drivers/net/wireless/intel/iwlwifi/mvm/ptp.c @@ -47,7 +47,7 @@ static void iwl_mvm_ptp_update_new_read(struct iwl_mvm *m= vm, u32 gp2) u64 iwl_mvm_ptp_get_adj_time(struct iwl_mvm *mvm, u64 base_time_ns) { struct ptp_data *data =3D &mvm->ptp_data; - u64 last_gp2_ns =3D mvm->ptp_data.scale_update_gp2 * NSEC_PER_USEC; + u64 last_gp2_ns =3D (u64)mvm->ptp_data.scale_update_gp2 * NSEC_PER_USEC; u64 res; u64 diff; =20 @@ -259,7 +259,7 @@ static int iwl_mvm_ptp_adjfine(struct ptp_clock_info *p= tp, long scaled_ppm) */ gp2 =3D iwl_mvm_get_systime(mvm); data->scale_update_adj_time_ns =3D - iwl_mvm_ptp_get_adj_time(mvm, gp2 * NSEC_PER_USEC); + iwl_mvm_ptp_get_adj_time(mvm, (u64)gp2 * NSEC_PER_USEC); data->scale_update_gp2 =3D gp2; data->wrap_counter =3D 0; data->delta =3D 0; diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c b/drivers/net/wi= reless/intel/iwlwifi/mvm/rxmq.c index 7f0b4f5daa21..7c21cd89db93 100644 --- a/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c +++ b/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c @@ -2016,8 +2016,8 @@ static void iwl_mvm_rx_fill_status(struct iwl_mvm *mv= m, rx_status->device_timestamp =3D phy_data->gp2_on_air_rise; =20 if (mvm->rx_ts_ptp && mvm->monitor_on) { - u64 adj_time =3D - iwl_mvm_ptp_get_adj_time(mvm, phy_data->gp2_on_air_rise * NSEC_PER_USEC= ); + u64 gp2_ns =3D (u64)phy_data->gp2_on_air_rise * NSEC_PER_USEC; + u64 adj_time =3D iwl_mvm_ptp_get_adj_time(mvm, gp2_ns); =20 rx_status->mactime =3D div64_u64(adj_time, NSEC_PER_USEC); rx_status->flag |=3D RX_FLAG_MACTIME_IS_RTAP_TS64; --=20 2.43.0 From nobody Sat Oct 3 04:49:59 2026 Received: from mail-pj1-f43.google.com (mail-pj1-f43.google.com [209.85.216.43]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7D8D43E7BB2 for ; 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Wed, 05 Aug 2026 01:26:52 -0700 (PDT) Received: from osman.mioffice.cn ([43.224.245.178]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-3903f5fdfe5sm1263278a91.4.2026.08.05.01.26.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 05 Aug 2026 01:26:52 -0700 (PDT) From: Zhan Xusheng X-Google-Original-From: Zhan Xusheng To: Miri Korenblit , linux-wireless@vger.kernel.org Cc: Johannes Berg , Richard Cochran , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, zhanxusheng@xiaomi.com Subject: [PATCH 2/2] wifi: iwlwifi: mld: Fix GP2 to nanoseconds overflow on 32-bit Date: Wed, 5 Aug 2026 16:25:15 +0800 Message-ID: <20260805082515.4136842-3-zhanxusheng@xiaomi.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260805082515.4136842-1-zhanxusheng@xiaomi.com> References: <20260805082515.4136842-1-zhanxusheng@xiaomi.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" GP2 is a free-running 32-bit microsecond hardware counter. The PTP code converts a u32 GP2 value to nanoseconds as: gp2 * NSEC_PER_USEC NSEC_PER_USEC is a plain 'long' (1000L), so on 32-bit builds this multiplication is evaluated in 32-bit arithmetic and overflows once the GP2 value exceeds ~4.29 million microseconds (~4.3 s). GP2 wraps only every 2^32 microseconds (~71.5 min), so the product is truncated for almost the entire counter range, producing bogus PTP timestamps. Neighbouring conversions already cast to u64 first (e.g. (u64)gp2 * NSEC_PER_USEC); these sites just missed the cast. Cast to u64 so the multiplication is performed in 64-bit, matching the existing call sites. 64-bit builds are unaffected. Fixes: d1e879ec600f ("wifi: iwlwifi: add iwlmld sub-driver") Fixes: f1699ad5857d ("wifi: iwlwifi: mld: add debugfs for using ptp clock t= ime for monitor interface") Signed-off-by: Zhan Xusheng --- drivers/net/wireless/intel/iwlwifi/mld/ptp.c | 4 ++-- drivers/net/wireless/intel/iwlwifi/mld/rx.c | 6 ++---- 2 files changed, 4 insertions(+), 6 deletions(-) diff --git a/drivers/net/wireless/intel/iwlwifi/mld/ptp.c b/drivers/net/wir= eless/intel/iwlwifi/mld/ptp.c index 1ac85d6ce1d7..81645f8caa54 100644 --- a/drivers/net/wireless/intel/iwlwifi/mld/ptp.c +++ b/drivers/net/wireless/intel/iwlwifi/mld/ptp.c @@ -59,7 +59,7 @@ static void iwl_mld_ptp_update_new_read(struct iwl_mld *m= ld, u32 gp2) u64 iwl_mld_ptp_get_adj_time(struct iwl_mld *mld, u64 base_time_ns) { struct ptp_data *data =3D &mld->ptp_data; - u64 scale_time_gp2_ns =3D mld->ptp_data.scale_update_gp2 * NSEC_PER_USEC; + u64 scale_time_gp2_ns =3D (u64)mld->ptp_data.scale_update_gp2 * NSEC_PER_= USEC; u64 res; u64 diff; s64 scaled_diff; @@ -159,7 +159,7 @@ static int iwl_mld_ptp_adjfine(struct ptp_clock_info *p= tp, long scaled_ppm) =20 spin_lock_bh(&data->lock); data->scale_update_adj_time_ns =3D - iwl_mld_ptp_get_adj_time(mld, gp2 * NSEC_PER_USEC); + iwl_mld_ptp_get_adj_time(mld, (u64)gp2 * NSEC_PER_USEC); data->scale_update_gp2 =3D gp2; =20 /* scale_update_adj_time_ns now relects the configured delta, the diff --git a/drivers/net/wireless/intel/iwlwifi/mld/rx.c b/drivers/net/wire= less/intel/iwlwifi/mld/rx.c index 269439d789f4..108ac70bfb14 100644 --- a/drivers/net/wireless/intel/iwlwifi/mld/rx.c +++ b/drivers/net/wireless/intel/iwlwifi/mld/rx.c @@ -1524,10 +1524,8 @@ static void iwl_mld_rx_fill_status(struct iwl_mld *m= ld, int link_id, iwl_mld_add_rtap_sniffer_config(mld, skb); =20 if (mld->monitor.ptp_time) { - u64 adj_time =3D - iwl_mld_ptp_get_adj_time(mld, - phy_data->gp2_on_air_rise * - NSEC_PER_USEC); + u64 gp2_ns =3D (u64)phy_data->gp2_on_air_rise * NSEC_PER_USEC; + u64 adj_time =3D iwl_mld_ptp_get_adj_time(mld, gp2_ns); =20 rx_status->mactime =3D div64_u64(adj_time, NSEC_PER_USEC); rx_status->flag |=3D RX_FLAG_MACTIME_IS_RTAP_TS64; --=20 2.43.0