linux-kernel - [PATCH] iommu/arm-smmu: Defer probe of clients after smmu device bound

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Message-ID: <20241001055633.21062-1-quic_pbrahma@quicinc.com>
Date: Tue, 1 Oct 2024 11:26:33 +0530
From: Pratyush Brahma <quic_pbrahma@...cinc.com>
To: <will@...nel.org>
CC: <robin.murphy@....com>, <joro@...tes.org>, <jgg@...pe.ca>,
        <jsnitsel@...hat.com>, <robdclark@...omium.org>,
        <quic_c_gdjako@...cinc.com>, <dmitry.baryshkov@...aro.org>,
        <linux-arm-kernel@...ts.infradead.org>, <iommu@...ts.linux.dev>,
        <linux-kernel@...r.kernel.org>,
        Pratyush Brahma
	<quic_pbrahma@...cinc.com>,
        Prakash Gupta <quic_guptap@...cinc.com>
Subject: [PATCH] iommu/arm-smmu: Defer probe of clients after smmu device bound

Null pointer dereference occurs due to a race between smmu
driver probe and client driver probe, when of_dma_configure()
for client is called after the iommu_device_register() for smmu driver
probe has executed but before the driver_bound() for smmu driver
has been called.

Following is how the race occurs:

T1:Smmu device probe		T2: Client device probe

really_probe()
arm_smmu_device_probe()
iommu_device_register()
					really_probe()
					platform_dma_configure()
					of_dma_configure()
					of_dma_configure_id()
					of_iommu_configure()
					iommu_probe_device()
					iommu_init_device()
					arm_smmu_probe_device()
					arm_smmu_get_by_fwnode()
						driver_find_device_by_fwnode()
						driver_find_device()
						next_device()
						klist_next()
							/* null ptr
							assigned to smmu */
					/* null ptr dereference
					while smmu->streamid_mask */
driver_bound()
	klist_add_tail()

When this null smmu pointer is dereferenced later in
arm_smmu_probe_device, the device crashes.

Fix this by deferring the probe of the client device
until the smmu device has bound to the arm smmu driver.

Co-developed-by: Prakash Gupta <quic_guptap@...cinc.com>
Signed-off-by: Prakash Gupta <quic_guptap@...cinc.com>
Signed-off-by: Pratyush Brahma <quic_pbrahma@...cinc.com>
Fixes: 021bb8420d44 ("iommu/arm-smmu: Wire up generic configuration support")
---
 drivers/iommu/arm/arm-smmu/arm-smmu.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu.c b/drivers/iommu/arm/arm-smmu/arm-smmu.c
index 723273440c21..1f2bafa92f1f 100644
--- a/drivers/iommu/arm/arm-smmu/arm-smmu.c
+++ b/drivers/iommu/arm/arm-smmu/arm-smmu.c
@@ -1437,6 +1437,8 @@ static struct iommu_device *arm_smmu_probe_device(struct device *dev)
 			goto out_free;
 	} else {
 		smmu = arm_smmu_get_by_fwnode(fwspec->iommu_fwnode);
+		if (!smmu)
+			return dev_err_probe(dev, -EPROBE_DEFER, "smmu dev has not bound yet\n");
 	}
 
 	ret = -EINVAL;
-- 
2.17.1