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 C124719E992; Thu, 20 Aug 2026 17:34:38 +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=1787247279; cv=none; b=q6B/SydIQwW1UPow2GluqCzGqAyyePNs/5sgeNB+DZqJbgzDXztpsg6cHIVHsCk5WfV2ygE3MaJcPMQ+4d2/a/INh1l+47wtoFYgtXu9FtoDNbuBO0jiaqo4bTo+2upPbigSmtg2bmG59de/SBXvqLBjQ8p4coZLqLDNjKCEgxA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787247279; c=relaxed/simple; bh=+ygMOUGUKaXBBG3C5PlO4Ruf9bxmf2J4ZPzN/lUM4a0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=uartMNkAY+7w2kgLz/76kzFPuYgAktEagxNkUKxynqhVGFByciukMHtKXnLAn8e4idog2PWS8f317eB5zsDAc4yLZ3JNt5S9GgEzGPBTGQiD31SzPn+xJGSR/5zuybZMg/OcIghhZAnQRGC2g7d+U1ikO2hHvXE4JlxX5X/3K5Y= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=1tWpeTtO; 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="1tWpeTtO" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D42A81F000E9; Thu, 20 Aug 2026 17:34:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1787247278; bh=Ty7QH1XaCjjzQSPZc8d8pmpoL8dJ6fecztQFRPgF7RA=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=1tWpeTtOtAVOHvtvTsZdswtSCxhPHNEs2rTspMNoO3LTPJfelPLdecziYJN5C7ZK2 /shxJ5PBHTxcTzr0ZSYeJl3tLOu63BMqQtdyTLV3OPkpd5ZlAXQb9Sg30nHtUoGg+v fTNluONPhZ72yHXZwv9eJgb6Cwt59nc0oUTEyUNA= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Siddharth Vadapalli , Chintan Vankar , Simon Horman , Jakub Kicinski , Sasha Levin Subject: [PATCH 6.12 211/220] net: ethernet: ti: am65-cpsw-nuss: Fix port_id extraction from SRC TAG Date: Thu, 20 Aug 2026 16:56:41 +0200 Message-ID: <20260820145229.863740059@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260820145223.480031205@linuxfoundation.org> References: <20260820145223.480031205@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 6.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Siddharth Vadapalli [ Upstream commit 36a05d2820077bb3955acb8111e1041d39148037 ] On the packet reception path, the ID of the MAC Port on which the packet was received, is embedded in the RX DMA Descriptor's metadata. The ID is extracted using the helper function cppi5_desc_get_tags_ids() which fills in the 16-bit Source Tag into the 'port_id' variable. However, it is only the lower 8-bits of the 16-bit Source Tag that represent the MAC Port ID, while the upper 8-bits are Hardware-Reserved and carry an arbitrary value. With the existing logic, sporadic kernel crash is observed due to the subsequent driver code accessing out-of-bound memory because of an invalid port_id. Hence, fix the port_id extraction logic to use only the lower 8-bits of the Source Tag as the MAC Port ID. Fixes: 93a76530316a ("net: ethernet: ti: introduce am65x/j721e gigabit eth subsystem driver") Signed-off-by: Siddharth Vadapalli Reviewed-by: Chintan Vankar Reviewed-by: Simon Horman Link: https://patch.msgid.link/20260807111738.2055900-1-s-vadapalli@ti.com Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin --- drivers/net/ethernet/ti/am65-cpsw-nuss.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/net/ethernet/ti/am65-cpsw-nuss.c b/drivers/net/ethernet/ti/am65-cpsw-nuss.c index 68049bb2bd989..45cea845d4aaa 100644 --- a/drivers/net/ethernet/ti/am65-cpsw-nuss.c +++ b/drivers/net/ethernet/ti/am65-cpsw-nuss.c @@ -1190,6 +1190,8 @@ static int am65_cpsw_nuss_rx_packets(struct am65_cpsw_rx_flow *flow, k3_udma_glue_rx_cppi5_to_dma_addr(rx_chn->rx_chn, &buf_dma); pkt_len = cppi5_hdesc_get_pktlen(desc_rx); cppi5_desc_get_tags_ids(&desc_rx->hdr, &port_id, NULL); + /* Port ID is contained in the lower 8-bits of the 16-bit Source Tag */ + port_id &= 0xFF; dev_dbg(dev, "%s rx port_id:%d\n", __func__, port_id); port = am65_common_get_port(common, port_id); ndev = port->ndev; -- 2.53.0