linux-kernel - [PATCH] of/device: Protect against binding of_platform

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 for Android: free password hash cracker in your pocket

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

Message-ID: <20100722222407.21517.46568.stgit@angua>
Date:	Thu, 22 Jul 2010 16:24:07 -0600
From:	Grant Likely <grant.likely@...retlab.ca>
To:	devicetree-discuss@...ts.ozlabs.org,
	Greg Kroah-Hartman <gregkh@...e.de>,
	linux-kernel@...r.kernel.org
Subject: [PATCH] of/device: Protect against binding of_platform_drivers to
	non-OF devices

There is an unlikely chance of this situation is occurring, but it is
easy to protect against.  If a matching entry cannot be found in the
of_match_table, then don't bind the driver.

Signed-off-by: Grant Likely <grant.likely@...retlab.ca>
---
 drivers/of/platform.c |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)

diff --git a/drivers/of/platform.c b/drivers/of/platform.c
index 712dfd8..f3f1ec8 100644
--- a/drivers/of/platform.c
+++ b/drivers/of/platform.c
@@ -30,8 +30,13 @@ static int platform_driver_probe_shim(struct platform_device *pdev)
 
 	pdrv = container_of(pdev->dev.driver, struct platform_driver, driver);
 	ofpdrv = container_of(pdrv, struct of_platform_driver, platform_driver);
+
+	/* There is an unlikely chance that an of_platform driver might match
+	 * on a non-OF platform device.  If so, then of_match_device() will
+	 * come up empty.  Return -EINVAL in this case so other drivers get
+	 * the chance to bind. */
 	match = of_match_device(pdev->dev.driver->of_match_table, &pdev->dev);
-	return ofpdrv->probe(pdev, match);
+	return match ? ofpdrv->probe(pdev, match) : -EINVAL;
 }
 
 static void platform_driver_shutdown_shim(struct platform_device *pdev)

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/