msi_setup_entry() only logs a message when the affinity vector can't be
allocated, and hence pci_irq_get_affinity() indexing entry->affinity is
wrong without a prior check.
Fixes: ee8d41e53efe "pci/msi: Retrieve affinity for a vector"
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
---
drivers/pci/msi.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- 4.9-rc4/drivers/pci/msi.c
+++ 4.9-rc4-PCI-MSI-no-affinity/drivers/pci/msi.c
@@ -1294,7 +1294,8 @@ const struct cpumask *pci_irq_get_affini
} 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];
--
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