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PCI/MSI: Check for NULL affinity mask in pci_irq_get_affinity()

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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: ee8d41e53e "pci/msi: Retrieve affinity for a vector"
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
CC: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Jan Beulich 2016-11-08 00:43:54 -07:00 committed by Bjorn Helgaas
parent 1001354ca3
commit d1d111e073
1 changed files with 2 additions and 1 deletions
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3
drivers/pci/msi.c
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@ -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];