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Message-ID: <f3091f6b15f9dd92325dbd3db36c43019718bff7.camel@collabora.com>
Date: Thu, 03 Apr 2025 10:25:31 +0200
From: Louis-Alexis Eyraud <louisalexis.eyraud@...labora.com>
To: Yong Wu (吴勇) <Yong.Wu@...iatek.com>,
"robin.murphy@....com" <robin.murphy@....com>, "joro@...tes.org"
<joro@...tes.org>, "robh@...nel.org" <robh@...nel.org>,
"matthias.bgg@...il.com" <matthias.bgg@...il.com>, "bhelgaas@...gle.com"
<bhelgaas@...gle.com>, "lpieralisi@...nel.org" <lpieralisi@...nel.org>,
AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
"will@...nel.org" <will@...nel.org>
Cc: "jroedel@...e.de" <jroedel@...e.de>, "kernel@...labora.com"
<kernel@...labora.com>, "linux-mediatek@...ts.infradead.org"
<linux-mediatek@...ts.infradead.org>, "jgg@...pe.ca" <jgg@...pe.ca>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] iommu/mediatek: Fix NULL pointer deference in
mtk_iommu_device_group
Hi,
On Thu, 2025-04-03 at 07:25 +0000, Yong Wu (吴勇) wrote:
> On Thu, 2025-03-27 at 11:46 +0100, Louis-Alexis Eyraud wrote:
> > External email : Please do not click links or open attachments
> > until
> > you have verified the sender or the content.
> >
> >
> > Currently, mtk_iommu calls during probe iommu_device_register
> > before
> > the hw_list from driver data is initialized. Since iommu probing
> > issue
> > fix, it leads to NULL pointer dereference in mtk_iommu_device_group
> > when
> > hw_list is accessed with list_first_entry (not null safe).
> >
> > So, change the call order to ensure iommu_device_register is called
> > after the driver data are initialized.
> >
> > Fixes: 9e3a2a643653 ("iommu/mediatek: Adapt sharing and non-sharing
> > pgtable case")
> > Fixes: bcb81ac6ae3c ("iommu: Get DT/ACPI parsing into the proper
> > probe path")
> > Signed-off-by: Louis-Alexis Eyraud
> > <louisalexis.eyraud@...labora.com>
> > ---
> > This patch fixes a NULL pointer dereference that occurs during the
> > mtk_iommu driver probe and observed at least on several Mediatek
> > Genio boards:
> > ```
> > Unable to handle kernel NULL pointer dereference at virtual address
> > 0000000000000000
> > Mem abort info:
> > ESR = 0x0000000096000004
> > EC = 0x25: DABT (current EL), IL = 32 bits
> > SET = 0, FnV = 0
> > EA = 0, S1PTW = 0
> > FSC = 0x04: level 0 translation fault
> > Data abort info:
> > ISV = 0, ISS = 0x00000004, ISS2 = 0x00000000
> > CM = 0, WnR = 0, TnD = 0, TagAccess = 0
> > GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0
> > user pgtable: 4k pages, 48-bit VAs, pgdp=0000000101380000
> > [0000000000000000] pgd=0000000000000000, p4d=0000000000000000
> > Internal error: Oops: 0000000096000004 [#1] SMP
> > Modules linked in: btusb btrtl mt6315_regulator btintel
> > mtk_vcodec_dec
> > btmtk v4l2_vp9 btbcm mtk_vcodec_enc v4l2_h264 mtk_vcodec_dbgfs
> > bluetooth mtk_jpeg ecdh_generic mtk_vcodec_common mtk_jpeg_enc_hw
> > mtk_jpeg_dec_hw ecc v4l2_mem2mem rfkill videobuf2_dma_contig
> > videobuf2_memops videobuf2_v4l2 videodev videobuf2_common mc
> > mt6360_charger mcp251xfd it5205 goodix_ts can_dev panfrost
> > drm_shmem_helper gpu_sched lvts_thermal mtk_svs mtk_adsp_mailbox
> > snd_soc_dmic mtk_scp mtk_rpmsg mtk_scp_ipi mtk_cmdq_mailbox
> > mediatek_cpufreq_hw spmi_mtk_pmif fuse dm_mod ip_tables x_tables
> > ipv6 mediatek_drm tcpci_mt6360 drm_display_helper drm_client_lib
> > tcpci drm_dma_helper drm_kms_helper tcpm drm mtk_mutex mtk_mmsys
> > typec rtc_mt6397 mtk_cmdq_helper phy_mtk_pcie pcie_mediatek_gen3
> > dwmac_mediatek stmmac_platform stmmac pwm_mtk_disp pcs_xpcs
> > pwm_bl
> > backlight
> > CPU: 5 UID: 0 PID: 12 Comm: kworker/u32:0 Not tainted 6.14.0-next-
> > 20250326 #4 PREEMPT
> > Hardware name: MediaTek Genio 1200 EVK-P1V2-EMMC (DT)
> > Workqueue: events_unbound deferred_probe_work_func
> > pstate: 80400009 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
> > pc : mtk_iommu_device_group+0x2c/0xe0
> > lr : __iommu_probe_device+0x130/0x490
> > sp : ffff8000827b3970
> > x29: ffff8000827b3970 x28: ffff0000c0028000 x27: ffff80008164f2b8
> > x26: ffff0000cbc47130 x25: ffff80008096a9f0 x24: ffff80008164f5a8
> > x23: ffff800082684b60 x22: ffff8000827b3a80 x21: ffff0000cbc47130
> > x20: ffffffffffffffed x19: ffff0000c117c010 x18: 0000000000000000
> > x17: 6f702d616d642d64 x16: 6574636972747365 x15: 0000000000000002
> > x14: 0000000000000000 x13: 0000000000128d55 x12: 6f632d616d642e30
> > x11: 0000000000000100 x10: 0000000000000001 x9 : 0000000000000220
> > x8 : 0101010101010101 x7 : ffff0000c117c010 x6 : 306c766f2c727461
> > x5 : 0000000000000000 x4 : ffff0000c10a2de8 x3 : ffff0000c10a2e70
> > x2 : ffff0000c01a4600 x1 : 0000000000000000 x0 : ffff0000c65470c0
> > Call trace:
> > mtk_iommu_device_group+0x2c/0xe0 (P)
> > __iommu_probe_device+0x130/0x490
> > probe_iommu_group+0x3c/0x70
> > bus_for_each_dev+0x7c/0xe0
> > iommu_device_register+0xd8/0x22c
> > mtk_iommu_probe+0x270/0x53c
> > platform_probe+0x68/0xd8
> > really_probe+0xbc/0x2c0
> > __driver_probe_device+0x78/0x120
> > driver_probe_device+0x3c/0x154
> > __device_attach_driver+0xb8/0x140
> > bus_for_each_drv+0x88/0xe8
> > __device_attach+0xa0/0x190
> > device_initial_probe+0x14/0x20
> > bus_probe_device+0xb4/0xc0
> > deferred_probe_work_func+0x90/0xc8
> > process_one_work+0x148/0x284
> > worker_thread+0x2cc/0x3cc
> > kthread+0x12c/0x204
> > ret_from_fork+0x10/0x20
> > Code: b4000500 f9401c01 92800254 f9409821 (f9400035)
> > ---[ end trace 0000000000000000 ]---
> > ```
> >
> > I've tested this patch on Mediatek Genio 510-EVK and 1200-EVK
> > boards
> > with a kernel based on linux-next (tag: next-20250327).
> > ---
> > drivers/iommu/mtk_iommu.c | 25 +++++++++++++------------
> > 1 file changed, 13 insertions(+), 12 deletions(-)
> >
> > diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
> > index
> > 034b0e670384a24df10130cbbff95ce8e0bc092d..14adb96a37bb0d84b631188e4
> > 8d
> > d8b936821a717 100644
> > --- a/drivers/iommu/mtk_iommu.c
> > +++ b/drivers/iommu/mtk_iommu.c
> > @@ -1372,15 +1372,6 @@ static int mtk_iommu_probe(struct
> > platform_device *pdev)
> > platform_set_drvdata(pdev, data);
> > mutex_init(&data->mutex);
> >
> > - ret = iommu_device_sysfs_add(&data->iommu, dev, NULL,
> > - "mtk-iommu.%pa", &ioaddr);
> > - if (ret)
> > - goto out_link_remove;
> > -
> > - ret = iommu_device_register(&data->iommu, &mtk_iommu_ops,
> > dev);
> > - if (ret)
> > - goto out_sysfs_remove;
> > -
> > if (MTK_IOMMU_HAS_FLAG(data->plat_data, SHARE_PGTABLE)) {
> > list_add_tail(&data->list, data->plat_data-
> > >hw_list);
> > data->hw_list = data->plat_data->hw_list;
> > @@ -1390,18 +1381,28 @@ static int mtk_iommu_probe(struct
> > platform_device *pdev)
> > data->hw_list = &data->hw_list_head;
> > }
> >
> > + ret = iommu_device_sysfs_add(&data->iommu, dev, NULL,
> > + "mtk-iommu.%pa", &ioaddr);
> > + if (ret)
> > + goto out_list_del;
> > +
> > + ret = iommu_device_register(&data->iommu, &mtk_iommu_ops,
> > dev);
> > + if (ret)
> > + goto out_link_remove;
>
>
> Typo here. Use out_sysfs_remove instead and remove out_link_remove
> label. Then,
>
> Reviewed-by: Yong Wu <yong.wu@...iatek.com>
>
> Thanks very much for this patch.
>
thanks for the review and detecting this issue in the patch.
I'll send a v2 to fix it.
Regards,
Louis-Alexis
> > +
> > if (MTK_IOMMU_IS_TYPE(data->plat_data, MTK_IOMMU_TYPE_MM))
> > {
> > ret = component_master_add_with_match(dev,
> > &mtk_iommu_com_ops, match);
> > if (ret)
> > - goto out_list_del;
> > + goto out_device_unregister;
> > }
> > return ret;
> >
> > -out_list_del:
> > - list_del(&data->list);
> > +out_device_unregister:
> > iommu_device_unregister(&data->iommu);
> > out_sysfs_remove:
> > iommu_device_sysfs_remove(&data->iommu);
> > +out_list_del:
> > + list_del(&data->list);
> > out_link_remove:
> > if (MTK_IOMMU_IS_TYPE(data->plat_data, MTK_IOMMU_TYPE_MM))
> > device_link_remove(data->smicomm_dev, dev);
> >
> > ---
> > base-commit: bc960e3e32c8b940c10b14557271355f66ae4db1
> > change-id: 20250327-fix-mtk-iommu-error-af6ec347d057
> >
> > Best regards,
> > --
> > Louis-Alexis Eyraud <louisalexis.eyraud@...labora.com>
> >
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