Patch "PCI/MSI: Check for NULL affinity mask in pci_irq_get_affinity()" has been added to the 4.9-stable tree

[<gregkh@linuxfoundation.org>]

This is a note to let you know that I've just added the patch titled

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

to the 4.9-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     pci-msi-check-for-null-affinity-mask-in-pci_irq_get_affinity.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From d1d111e073840b8dbc1ae90ba3fc274736451bdc Mon Sep 17 00:00:00 2001
From: Jan Beulich <JBeulich@suse.com>
Date: Tue, 8 Nov 2016 00:43:54 -0700
Subject: PCI/MSI: Check for NULL affinity mask in pci_irq_get_affinity()

From: Jan Beulich <JBeulich@suse.com>

commit d1d111e073840b8dbc1ae90ba3fc274736451bdc upstream.

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 <jbeulich@suse.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
CC: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/pci/msi.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/pci/msi.c
+++ b/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];


Patches currently in stable-queue which might be from JBeulich@suse.com are

queue-4.9/pci-msi-check-for-null-affinity-mask-in-pci_irq_get_affinity.patch