PCI: endpoint: Add MSI set maximum restriction

Add pci_epc_set_msi() maximum 32 interrupts validation.

Signed-off-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Acked-by: Kishon Vijay Abraham I <kishon@ti.com>

diff --git a/drivers/pci/endpoint/pci-epc-core.c b/drivers/pci/endpoint/pci-epc-core.c
index c72e656..094dcc3 100644 (file)
--- a/drivers/pci/endpoint/pci-epc-core.c
+++ b/drivers/pci/endpoint/pci-epc-core.c
@@ -201,7 +201,8 @@ int pci_epc_set_msi(struct pci_epc *epc, u8 func_no, u8 interrupts)
        u8 encode_int;
        unsigned long flags;
 
-       if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions)
+       if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions ||
+           interrupts > 32)
                return -EINVAL;
 
        if (!epc->ops->set_msi)