linux-kernel - [PATCH] bus: fsl-mc-bus: fix KASAN use-after-free in fsl_mc_bus

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Date:   Wed,  1 Jun 2022 19:51:59 +0900
From:   Shin'ichiro Kawasaki <shinichiro.kawasaki@....com>
To:     linux-kernel@...r.kernel.org, Stuart Yoder <stuyoder@...il.com>,
        Laurentiu Tudor <laurentiu.tudor@....com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Bharat Bhushan <Bharat.Bhushan@....com>,
        Damien Le Moal <damien.lemoal@...nsource.wdc.com>,
        Shin'ichiro Kawasaki <shinichiro.kawasaki@....com>
Subject: [PATCH] bus: fsl-mc-bus: fix KASAN use-after-free in fsl_mc_bus_remove()

In fsl_mc_bus_remove(), mc->root_mc_bus_dev->mc_io is passed to
fsl_destroy_mc_io(). However, mc->root_mc_bus_dev is already freed in
fsl_mc_device_remove(). Then reference to mc->root_mc_bus_dev->mc_io
triggers KASAN use-after-free. To avoid the use-after-free, keep the
reference to mc->root_mc_bus_dev->mc_io in a local variable and pass to
fsl_destroy_mc_io().

This patch needs rework to apply to kernels older than v5.15.

Fixes: f93627146f0e ("staging: fsl-mc: fix asymmetry in destroy of mc_io")
Signed-off-by: Shin'ichiro Kawasaki <shinichiro.kawasaki@....com>
Cc: stable@...r.kernel.org # v5.15+
---
 drivers/bus/fsl-mc/fsl-mc-bus.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/bus/fsl-mc/fsl-mc-bus.c b/drivers/bus/fsl-mc/fsl-mc-bus.c
index 8fd4a356a86e..74593a1722fe 100644
--- a/drivers/bus/fsl-mc/fsl-mc-bus.c
+++ b/drivers/bus/fsl-mc/fsl-mc-bus.c
@@ -1236,14 +1236,14 @@ static int fsl_mc_bus_probe(struct platform_device *pdev)
 static int fsl_mc_bus_remove(struct platform_device *pdev)
 {
 	struct fsl_mc *mc = platform_get_drvdata(pdev);
+	struct fsl_mc_io *mc_io;
 
 	if (!fsl_mc_is_root_dprc(&mc->root_mc_bus_dev->dev))
 		return -EINVAL;
 
+	mc_io = mc->root_mc_bus_dev->mc_io;
 	fsl_mc_device_remove(mc->root_mc_bus_dev);
-
-	fsl_destroy_mc_io(mc->root_mc_bus_dev->mc_io);
-	mc->root_mc_bus_dev->mc_io = NULL;
+	fsl_destroy_mc_io(mc_io);
 
 	bus_unregister_notifier(&fsl_mc_bus_type, &fsl_mc_nb);
 
-- 
2.35.3