From d1d111e073840b8dbc1ae90ba3fc274736451bdc Mon Sep 17 00:00:00 2001 From: Jan Beulich Date: Tue, 8 Nov 2016 00:43:54 -0700 Subject: PCI/MSI: Check for NULL affinity mask in pci_irq_get_affinity() If msi_setup_entry() fails to allocate an affinity mask, it logs a message but continues on and allocates an MSI entry with entry->affinity == NULL. Check for this case in pci_irq_get_affinity() so we don't try to dereference a NULL pointer. [bhelgaas: changelog] Fixes: ee8d41e53efe "pci/msi: Retrieve affinity for a vector" Signed-off-by: Jan Beulich Signed-off-by: Bjorn Helgaas Reviewed-by: Christoph Hellwig CC: Thomas Gleixner --- drivers/pci/msi.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'drivers/pci/msi.c') diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c index bfdd0744b686..da4e3c1248db 100644 --- a/drivers/pci/msi.c +++ b/drivers/pci/msi.c @@ -1292,7 +1292,8 @@ const struct cpumask *pci_irq_get_affinity(struct pci_dev *dev, int nr) } else if (dev->msi_enabled) { struct msi_desc *entry = first_pci_msi_entry(dev); - if (WARN_ON_ONCE(!entry || nr >= entry->nvec_used)) + if (WARN_ON_ONCE(!entry || !entry->affinity || + nr >= entry->nvec_used)) return NULL; return &entry->affinity[nr]; -- cgit