linux-kernel - [PATCH] PCI: endpoint: set_msi: return -EINVAL when interrupts num is smaller than 1

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Message-ID: <CH2PR19MB402491B9E503694DBCAC6005A07C9@CH2PR19MB4024.namprd19.prod.outlook.com>
Date:   Tue, 21 Dec 2021 02:59:56 +0000
From:   Li Chen <lchen@...arella.com>
To:     Kishon Vijay Abraham I <kishon@...com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Krzysztof Wilczyński <kw@...ux.com>
Subject: [PATCH] PCI: endpoint: set_msi: return -EINVAL when interrupts num is
 smaller than 1

There is no sense to go further if we have no interrupts.

Signed-off-by: Li Chen <lchen@...arella.com>
---
 drivers/pci/endpoint/pci-epc-core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/pci/endpoint/pci-epc-core.c b/drivers/pci/endpoint/pci-epc-core.c
index 38621558d3975..3bc9273d0a082 100644
--- a/drivers/pci/endpoint/pci-epc-core.c
+++ b/drivers/pci/endpoint/pci-epc-core.c
@@ -334,7 +334,7 @@ int pci_epc_set_msi(struct pci_epc *epc, u8 func_no, u8 vfunc_no, u8 interrupts)
 	u8 encode_int;
 
 	if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions ||
-	    interrupts > 32)
+	    interrupts < 1 || interrupts > 32)
 		return -EINVAL;
 
 	if (vfunc_no > 0 && (!epc->max_vfs || vfunc_no > epc->max_vfs[func_no]))
-- 
2.34.1

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