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Message-Id: <20220117092759.1619771-1-ztong0001@gmail.com> Date: Mon, 17 Jan 2022 01:27:59 -0800 From: Tong Zhang <ztong0001@...il.com> To: Marc Zyngier <maz@...nel.org>, Thomas Gleixner <tglx@...utronix.de>, Jason Gunthorpe <jgg@...pe.ca>, linux-kernel@...r.kernel.org Cc: Tong Zhang <ztong0001@...il.com> Subject: [PATCH v1] genirq/msi: fix crash when handling Multi-MSI pci_msi_domain_check_cap() could return 1 when domain does not support multi MSI and user request multi MSI. This positive value will be used by __pci_enable_msi_range(). In previous refactor, this positive value is handled as error case which will cause kernel crash. [ 1.197953] BUG: KASAN: use-after-free in __pci_enable_msi_range+0x234/0x320 [ 1.198327] Freed by task 1: [ 1.198327] kfree+0x8f/0x2b0 [ 1.198327] msi_free_msi_descs_range+0xf5/0x130 [ 1.198327] msi_domain_alloc_irqs_descs_locked+0x8d/0xa0 [ 1.198327] __pci_enable_msi_range+0x1a4/0x320 [ 1.198327] pci_alloc_irq_vectors_affinity+0x135/0x1a0 [ 1.198327] pcie_port_device_register+0x4a1/0x5c0 [ 1.198327] pcie_portdrv_probe+0x50/0x100 Fixes: 0f62d941acf9 ("genirq/msi: Provide msi_domain_alloc/free_irqs_descs_locked()") Signed-off-by: Tong Zhang <ztong0001@...il.com> --- kernel/irq/msi.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/irq/msi.c b/kernel/irq/msi.c index 2bdfce5edafd..57b1447a3bf1 100644 --- a/kernel/irq/msi.c +++ b/kernel/irq/msi.c @@ -935,7 +935,7 @@ int msi_domain_alloc_irqs_descs_locked(struct irq_domain *domain, struct device return ret; ret = ops->domain_alloc_irqs(domain, dev, nvec); - if (ret) + if (ret < 0) msi_domain_free_irqs_descs_locked(domain, dev); return ret; } -- 2.25.1
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