linux-kernel - [PATCH 4.19 193/220] spi: spidev: Fix OF tree warning logic

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20191122100927.947018059@linuxfoundation.org>
Date:   Fri, 22 Nov 2019 11:29:18 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Trent Piepho <tpiepho@...inj.com>,
        Jan KundrÃ¡t <jan.kundrat@...net.cz>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Mark Brown <broonie@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 193/220] spi: spidev: Fix OF tree warning logic

From: Trent Piepho <tpiepho@...inj.com>

[ Upstream commit 605b3bec73cbd74b4ac937b580cd0b47d1300484 ]

spidev will make a big fuss if a device tree node binds a device by
using "spidev" as the node's compatible property.

However, the logic for this isn't looking for "spidev" in the
compatible, but rather checking that the device is NOT compatible with
spidev's list of devices.

This causes a false positive if a device not named "rohm,dh2228fv", etc.
binds to spidev, even if a means other than putting "spidev" in the
device tree was used.  E.g., the sysfs driver_override attribute.

Signed-off-by: Trent Piepho <tpiepho@...inj.com>
Reviewed-by: Jan KundrÃ¡t <jan.kundrat@...net.cz>
Tested-by: Jan KundrÃ¡t <jan.kundrat@...net.cz>
Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/spi/spidev.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/drivers/spi/spidev.c b/drivers/spi/spidev.c
index cda10719d1d1b..c5fe08bc34a0a 100644
--- a/drivers/spi/spidev.c
+++ b/drivers/spi/spidev.c
@@ -724,11 +724,9 @@ static int spidev_probe(struct spi_device *spi)
 	 * compatible string, it is a Linux implementation thing
 	 * rather than a description of the hardware.
 	 */
-	if (spi->dev.of_node && !of_match_device(spidev_dt_ids, &spi->dev)) {
-		dev_err(&spi->dev, "buggy DT: spidev listed directly in DT\n");
-		WARN_ON(spi->dev.of_node &&
-			!of_match_device(spidev_dt_ids, &spi->dev));
-	}
+	WARN(spi->dev.of_node &&
+	     of_device_is_compatible(spi->dev.of_node, "spidev"),
+	     "%pOF: buggy DT: spidev listed directly in DT\n", spi->dev.of_node);
 
 	spidev_probe_acpi(spi);
 
-- 
2.20.1