From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 12B8536C59E; Mon, 23 Mar 2026 14:55:32 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774277732; cv=none; b=dGILyAckL3cmQ+NSt1vEc91esdJgFqG9SoW84dcsB65g47mzLjW8azzpVb3T8ZPmApExBlNZHwiFNj6dS+hVpq+ta6Q5xvmxPwS522bPB/e+xKhblij94P24R449d60wzxsoZToIUmnMePgLgghmbz1SK/P7kTd5haxYHN1pmKM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774277732; c=relaxed/simple; bh=4eZZO4u64ag7i1FbJMzKYyT+EIlsopEM0aNVtxg2bLE=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=pt7mu7DBnuvU+eLHhW/lNrKVu++LtUB4yTBbFpxOYjtTZD18GQHw80MCP09RiovnE/RhzR2u9sJ4kHri/ZCBQfeWbhwGy5atyiUULPPBWZxVEkE6O77oR/j9EGzKXGDqZkH5leVILJ6KziBUhZdPuuEEKLjhEzHvT497t0jurCU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=P6GWIAnr; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="P6GWIAnr" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 87DEDC4CEF7; Mon, 23 Mar 2026 14:55:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1774277732; bh=4eZZO4u64ag7i1FbJMzKYyT+EIlsopEM0aNVtxg2bLE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=P6GWIAnru7PiKKYT9/CEamHOskOzvMyceSisds6uLlpOl+fl1WY1xnoK/63JKJQoH 8BLa2QwHcWq2vUsGXe9zBqGQbUxGb5AgcDC4Aurr/de/b026Bd/k5PnfYPDOIYVuvJ WksqEQqsHhF62A+bY7U76rgIeL3uEdhnhhjBqZ6k= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Simon Horman , Ethan Nelson-Moore , Paolo Abeni , Sasha Levin Subject: [PATCH 6.6 084/567] net: arcnet: com20020-pci: fix support for 2.5Mbit cards Date: Mon, 23 Mar 2026 14:40:04 +0100 Message-ID: <20260323134535.908119587@linuxfoundation.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260323134533.749096647@linuxfoundation.org> References: <20260323134533.749096647@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Ethan Nelson-Moore [ Upstream commit c7d9be66b71af490446127c6ffcb66d6bb71b8b9 ] Commit 8c14f9c70327 ("ARCNET: add com20020 PCI IDs with metadata") converted the com20020-pci driver to use a card info structure instead of a single flag mask in driver_data. However, it failed to take into account that in the original code, driver_data of 0 indicates a card with no special flags, not a card that should not have any card info structure. This introduced a null pointer dereference when cards with no flags were probed. Commit bd6f1fd5d33d ("net: arcnet: com20020: Fix null-ptr-deref in com20020pci_probe()") then papered over this issue by rejecting cards with no driver_data instead of resolving the problem at its source. Fix the original issue by introducing a new card info structure for 2.5Mbit cards that does not set any flags and using it if no driver_data is present. Fixes: 8c14f9c70327 ("ARCNET: add com20020 PCI IDs with metadata") Fixes: bd6f1fd5d33d ("net: arcnet: com20020: Fix null-ptr-deref in com20020pci_probe()") Cc: stable@vger.kernel.org Reviewed-by: Simon Horman Signed-off-by: Ethan Nelson-Moore Link: https://patch.msgid.link/20260213045510.32368-1-enelsonmoore@gmail.com Signed-off-by: Paolo Abeni Signed-off-by: Sasha Levin --- drivers/net/arcnet/com20020-pci.c | 16 +++++++++++++++- 1 file changed, 15 insertions(+), 1 deletion(-) diff --git a/drivers/net/arcnet/com20020-pci.c b/drivers/net/arcnet/com20020-pci.c index e7db6a4e4dc9d..e9ee32b091a41 100644 --- a/drivers/net/arcnet/com20020-pci.c +++ b/drivers/net/arcnet/com20020-pci.c @@ -114,6 +114,8 @@ static const struct attribute_group com20020_state_group = { .attrs = com20020_state_attrs, }; +static struct com20020_pci_card_info card_info_2p5mbit; + static void com20020pci_remove(struct pci_dev *pdev); static int com20020pci_probe(struct pci_dev *pdev, @@ -139,7 +141,7 @@ static int com20020pci_probe(struct pci_dev *pdev, ci = (struct com20020_pci_card_info *)id->driver_data; if (!ci) - return -EINVAL; + ci = &card_info_2p5mbit; priv->ci = ci; mm = &ci->misc_map; @@ -346,6 +348,18 @@ static struct com20020_pci_card_info card_info_5mbit = { .flags = ARC_IS_5MBIT, }; +static struct com20020_pci_card_info card_info_2p5mbit = { + .name = "ARC-PCI", + .devcount = 1, + .chan_map_tbl = { + { + .bar = 2, + .offset = 0x00, + .size = 0x08, + }, + }, +}; + static struct com20020_pci_card_info card_info_sohard = { .name = "SOHARD SH ARC-PCI", .devcount = 1, -- 2.51.0