From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id CEEBF3E7631; Fri, 4 Sep 2026 05:59:46 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788501588; cv=none; b=LP4crtOazZS9TGlzQNp/hTg5s7knja7KaL2yUWtguako/2K7AfWMuF29t9Ly5Mth/8w9ZWV+z3oDXGL8/+CivYTKxWTFePimJk1WkrZ08IBUrf47ClCS9jP6nbsoVy3atXRx4kGfPeaHkjIF4Pt0OseYm2DTUa1qBFW3cl/gokk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788501588; c=relaxed/simple; bh=a6avYsvilWM25e7VnB+4aC3koJ1pzdh6gUKjGBRdnqI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=guSu7o72OhlBjkvEKCM5+H3jv0H5fo1M3qUwh9Sm+C3EyXXvQJVSMEz1Y2Ip3c3b0QAy+jGa4r0jWnfpSXsGXCzKs7dT6obb0IZX2oN8Ga57inv5dggIE2u8dgKZUgVADoz4i4RsGPAVZ3PjtP6Zt+BEYyqjavhcQhYQie7T3kE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=o9rE+MLt; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="o9rE+MLt" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3338B1F00A3D; Fri, 4 Sep 2026 05:59:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1788501586; bh=Z6/mJfsiB1ILM0wlZMBKBLR+ey1H3WOeehUETv7Th0A=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=o9rE+MLtSRokooWXjxH/CRqS6YYS+EGc24POWr4WLqX/Pzo72l+hBXfRFEvZvEVvx eDDH/L37ZQu/VLKTLyFn3q7jqfKYFmKqEX13HZhXd8ZEG2zqyVABY8GLsiB8DFlo8n lmU+oVQcCBh4dVTZ0vIw77Ek+g4Qfefkn1cffKn0= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Vadim Fedorenko , Xuanqiang Luo , Jakub Kicinski Subject: [PATCH 6.18 462/552] net: ravb: avoid dereferencing an invalid PTP clock Date: Fri, 4 Sep 2026 07:00:19 +0200 Message-ID: <20260904045801.175866843@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260904045747.813364717@linuxfoundation.org> References: <20260904045747.813364717@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Xuanqiang Luo commit 1f77af0aaf277413ff32f6ff8c2c4282bd64c897 upstream. The PTP clock is unavailable before the first open, so querying its index can dereference a NULL pointer. Registration failures can also leave an error pointer in priv->ptp.clock. Cache the PHC index separately and report -1 while no clock is registered. Normalize registration errors to NULL and preserve the static timestamping capabilities. Fixes: a0d2f20650e8 ("Renesas Ethernet AVB PTP clock driver") Cc: stable@vger.kernel.org Reviewed-by: Vadim Fedorenko Signed-off-by: Xuanqiang Luo Link: https://patch.msgid.link/20260811103733.62599-2-xuanqiang.luo@linux.dev Signed-off-by: Jakub Kicinski Signed-off-by: Greg Kroah-Hartman --- drivers/net/ethernet/renesas/ravb.h | 1 + drivers/net/ethernet/renesas/ravb_main.c | 3 ++- drivers/net/ethernet/renesas/ravb_ptp.c | 15 +++++++++++++-- 3 files changed, 16 insertions(+), 3 deletions(-) --- a/drivers/net/ethernet/renesas/ravb.h +++ b/drivers/net/ethernet/renesas/ravb.h @@ -1039,6 +1039,7 @@ struct ravb_ptp_perout { struct ravb_ptp { struct ptp_clock *clock; struct ptp_clock_info info; + int phc_index; u32 default_addend; u32 current_addend; int extts[N_EXT_TS]; --- a/drivers/net/ethernet/renesas/ravb_main.c +++ b/drivers/net/ethernet/renesas/ravb_main.c @@ -1757,7 +1757,7 @@ static int ravb_get_ts_info(struct net_d (1 << HWTSTAMP_FILTER_NONE) | (1 << HWTSTAMP_FILTER_PTP_V2_L2_EVENT) | (1 << HWTSTAMP_FILTER_ALL); - info->phc_index = ptp_clock_index(priv->ptp.clock); + info->phc_index = READ_ONCE(priv->ptp.phc_index); } return 0; @@ -2963,6 +2963,7 @@ static int ravb_probe(struct platform_de priv->rstc = rstc; priv->ndev = ndev; priv->pdev = pdev; + priv->ptp.phc_index = -1; priv->num_tx_ring[RAVB_BE] = BE_TX_RING_SIZE; priv->num_rx_ring[RAVB_BE] = BE_RX_RING_SIZE; if (info->nc_queues) { --- a/drivers/net/ethernet/renesas/ravb_ptp.c +++ b/drivers/net/ethernet/renesas/ravb_ptp.c @@ -315,6 +315,7 @@ void ravb_ptp_interrupt(struct net_devic void ravb_ptp_init(struct net_device *ndev, struct platform_device *pdev) { struct ravb_private *priv = netdev_priv(ndev); + struct ptp_clock *clock; unsigned long flags; priv->ptp.info = ravb_ptp_info; @@ -327,7 +328,15 @@ void ravb_ptp_init(struct net_device *nd ravb_modify(ndev, GCCR, GCCR_TCSS, GCCR_TCSS_ADJGPTP); spin_unlock_irqrestore(&priv->lock, flags); - priv->ptp.clock = ptp_clock_register(&priv->ptp.info, &pdev->dev); + clock = ptp_clock_register(&priv->ptp.info, &pdev->dev); + if (IS_ERR(clock)) { + netdev_err(ndev, "failed to register PTP clock: %pe\n", clock); + clock = NULL; + } + + priv->ptp.clock = clock; + if (clock) + WRITE_ONCE(priv->ptp.phc_index, ptp_clock_index(clock)); } void ravb_ptp_stop(struct net_device *ndev) @@ -337,5 +346,7 @@ void ravb_ptp_stop(struct net_device *nd ravb_write(ndev, 0, GIC); ravb_write(ndev, 0, GIS); - ptp_clock_unregister(priv->ptp.clock); + WRITE_ONCE(priv->ptp.phc_index, -1); + if (priv->ptp.clock) + ptp_clock_unregister(priv->ptp.clock); }