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Message-ID: <20211012071556.939137-1-wanghai38@huawei.com> Date: Tue, 12 Oct 2021 15:15:56 +0800 From: Wang Hai <wanghai38@...wei.com> To: <bhelgaas@...gle.com>, <andy.shevchenko@...il.com>, <maz@...nel.org>, <tglx@...utronix.de>, <song.bao.hua@...ilicon.com>, <21cnbao@...il.com>, <gregkh@...uxfoundation.org> CC: <linux-pci@...r.kernel.org>, <linux-kernel@...r.kernel.org> Subject: [PATCH v3] PCI/MSI: fix page fault when msi_populate_sysfs() failed I got a page fault report when doing fault injection test: BUG: unable to handle page fault for address: fffffffffffffff4 ... RIP: 0010:sysfs_remove_groups+0x25/0x60 ... Call Trace: msi_destroy_sysfs+0x30/0xa0 free_msi_irqs+0x11d/0x1b0 __pci_enable_msix_range+0x67f/0x760 pci_alloc_irq_vectors_affinity+0xe7/0x170 vp_find_vqs_msix+0x129/0x560 vp_find_vqs+0x52/0x230 vp_modern_find_vqs+0x47/0xb0 p9_virtio_probe+0xa1/0x460 [9pnet_virtio] ... entry_SYSCALL_64_after_hwframe+0x44/0xae When populating msi_irqs sysfs failed (such as msi_attrs = kcalloc() in msi_populate_sysfs() failed) in msi_capability_init() or msix_capability_init(), dev->msi_irq_groups will point to ERR_PTR(...). This will cause a page fault when destroying the wrong dev->msi_irq_groups in free_msi_irqs(). msix_capability_init()/msi_capability_init() msi_populate_sysfs() msi_attrs = kcalloc() // fault injection, let msi_attrs = NULL free_msi_irqs() msi_destroy_sysfs() // msi_irq_groups is ERR_PTR(...), page fault Define a temp variable and assign it to dev->msi_irq_groups if the temp variable is not PTR_ERR. Fixes: 2f170814bdd2 ("genirq/msi: Move MSI sysfs handling from PCI to MSI core") Reported-by: Hulk Robot <hulkci@...wei.com> Signed-off-by: Wang Hai <wanghai38@...wei.com> Acked-by: Barry Song <song.bao.hua@...ilicon.com> --- v2->v3: refine the commit log v1->v2: introduce temporary variable 'groups' drivers/pci/msi.c | 18 ++++++++++++------ 1 file changed, 12 insertions(+), 6 deletions(-) diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c index 0099a00af361..4b4792940e86 100644 --- a/drivers/pci/msi.c +++ b/drivers/pci/msi.c @@ -535,6 +535,7 @@ static int msi_verify_entries(struct pci_dev *dev) static int msi_capability_init(struct pci_dev *dev, int nvec, struct irq_affinity *affd) { + const struct attribute_group **groups; struct msi_desc *entry; int ret; @@ -558,12 +559,14 @@ static int msi_capability_init(struct pci_dev *dev, int nvec, if (ret) goto err; - dev->msi_irq_groups = msi_populate_sysfs(&dev->dev); - if (IS_ERR(dev->msi_irq_groups)) { - ret = PTR_ERR(dev->msi_irq_groups); + groups = msi_populate_sysfs(&dev->dev); + if (IS_ERR(groups)) { + ret = PTR_ERR(groups); goto err; } + dev->msi_irq_groups = groups; + /* Set MSI enabled bits */ pci_intx_for_msi(dev, 0); pci_msi_set_enable(dev, 1); @@ -691,6 +694,7 @@ static void msix_mask_all(void __iomem *base, int tsize) static int msix_capability_init(struct pci_dev *dev, struct msix_entry *entries, int nvec, struct irq_affinity *affd) { + const struct attribute_group **groups; void __iomem *base; int ret, tsize; u16 control; @@ -730,12 +734,14 @@ static int msix_capability_init(struct pci_dev *dev, struct msix_entry *entries, msix_update_entries(dev, entries); - dev->msi_irq_groups = msi_populate_sysfs(&dev->dev); - if (IS_ERR(dev->msi_irq_groups)) { - ret = PTR_ERR(dev->msi_irq_groups); + groups = msi_populate_sysfs(&dev->dev); + if (IS_ERR(groups)) { + ret = PTR_ERR(groups); goto out_free; } + dev->msi_irq_groups = groups; + /* Set MSI-X enabled bits and unmask the function */ pci_intx_for_msi(dev, 0); dev->msix_enabled = 1; -- 2.17.1
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