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 672B9250BEC; Mon, 23 Jun 2025 13:28:51 +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=1750685331; cv=none; b=OiQ7w3ynRFflhuNGK4LI/aCDuAVyWki9arE5hFrjs/Vddp33UFEOCvpo68bvwhep/wxj0Z4fN0rPzd6cIB6BK8M//d04YlbRqDFZNvGTquyaSPKJAXf9VriP7ahmep05PmqayHBtpomIKA1T8OE4hWTUBzx2RaBaA0juqL1UKaA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1750685331; c=relaxed/simple; bh=QSSmpiv5FBe9B/o8u996/+lNauUB17u7wHMbTonn32I=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=rivN5C7F/kTqy1ozJPtyr52CovRM7NUiYbMX/l0KprgFR3dpXwWhDEoxZCrAOKRcA2U9LCXcGVcu4kgq4d1Cwal9uC5+7JimS9e76jqHHAWCEVL/YhNrMGR1NYEbXzmNoGXsAXnRlFlXyYqajPhYCz0fzeGLisYpCQUeowdaqzU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=0QnvSio+; 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="0QnvSio+" Received: by smtp.kernel.org (Postfix) with ESMTPSA id F04D2C4CEEA; Mon, 23 Jun 2025 13:28:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1750685331; bh=QSSmpiv5FBe9B/o8u996/+lNauUB17u7wHMbTonn32I=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=0QnvSio+xfdUGtk9C06uOSjBg66IylBbFzWeiecOiYBfGEcHdkeOpErDz7t3yp3Nn QOXQOjMxExSkQ7RMlDLBtJw32Qp5aFly9e8odkVurx9Gvn9JQs2csaWs1A7ogFxwiA 0deUBv1axjnvaFb/Iq0N+ozYTTJkRcFXwD5hczxA= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Andrew Lunn , Michael Walle , Jakub Kicinski , Sasha Levin Subject: [PATCH 5.4 086/222] net: mdio: C22 is now optional, EOPNOTSUPP if not provided Date: Mon, 23 Jun 2025 15:07:01 +0200 Message-ID: <20250623130614.689593769@linuxfoundation.org> X-Mailer: git-send-email 2.50.0 In-Reply-To: <20250623130611.896514667@linuxfoundation.org> References: <20250623130611.896514667@linuxfoundation.org> User-Agent: quilt/0.68 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 5.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Andrew Lunn [ Upstream commit b063b1924fd9bf0bc157cf644764dc2151d04ccc ] When performing a C22 operation, check that the bus driver actually provides the methods, and return -EOPNOTSUPP if not. C45 only busses do exist, and in future their C22 methods will be NULL. Signed-off-by: Andrew Lunn Signed-off-by: Michael Walle Signed-off-by: Jakub Kicinski Stable-dep-of: 0e629694126c ("net/mdiobus: Fix potential out-of-bounds read/write access") Signed-off-by: Sasha Levin --- drivers/net/phy/mdio_bus.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/drivers/net/phy/mdio_bus.c b/drivers/net/phy/mdio_bus.c index fdf8221f46fa5..e5c25beae21e0 100644 --- a/drivers/net/phy/mdio_bus.c +++ b/drivers/net/phy/mdio_bus.c @@ -565,7 +565,10 @@ int __mdiobus_read(struct mii_bus *bus, int addr, u32 regnum) WARN_ON_ONCE(!mutex_is_locked(&bus->mdio_lock)); - retval = bus->read(bus, addr, regnum); + if (bus->read) + retval = bus->read(bus, addr, regnum); + else + retval = -EOPNOTSUPP; trace_mdio_access(bus, 1, addr, regnum, retval, retval); @@ -590,7 +593,10 @@ int __mdiobus_write(struct mii_bus *bus, int addr, u32 regnum, u16 val) WARN_ON_ONCE(!mutex_is_locked(&bus->mdio_lock)); - err = bus->write(bus, addr, regnum, val); + if (bus->write) + err = bus->write(bus, addr, regnum, val); + else + err = -EOPNOTSUPP; trace_mdio_access(bus, 0, addr, regnum, val, err); -- 2.39.5