Patch "x86/apic/vector: Handle legacy irq data correctly" 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

    x86/apic/vector: Handle legacy irq data correctly

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:
     x86-apic-vector-handle-legacy-irq-data-correctly.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 ben.hutchings@codethink.co.uk  Wed Mar  7 11:01:18 2018
From: Ben Hutchings <ben.hutchings@codethink.co.uk>
Date: Wed, 7 Mar 2018 18:36:43 +0000
Subject: x86/apic/vector: Handle legacy irq data correctly
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Thomas Gleixner <tglx@linutronix.de>, stable@vger.kernel.org
Message-ID: <20180307183643.7vy7znqgismeh62p@xylophone.i.decadent.org.uk>
Content-Disposition: inline


From: Thomas Gleixner <tglx@linutronix.de>

The backport of upstream commit 45d55e7bac40 ("x86/apic/vector: Fix off by
one in error path") missed to fixup the legacy interrupt data which is not
longer available upstream.

Handle legacy irq data correctly by clearing the legacy storage to prevent
use after free.

Fixes: 7fd133539289 ("x86/apic/vector: Fix off by one in error path") - 4.4.y
Fixes: c557481a9491 ("x86/apic/vector: Fix off by one in error path") - 4.9.y
Reported-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 arch/x86/kernel/apic/vector.c |   14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

--- a/arch/x86/kernel/apic/vector.c
+++ b/arch/x86/kernel/apic/vector.c
@@ -93,8 +93,12 @@ out_data:
 	return NULL;
 }
 
-static void free_apic_chip_data(struct apic_chip_data *data)
+static void free_apic_chip_data(unsigned int virq, struct apic_chip_data *data)
 {
+#ifdef	CONFIG_X86_IO_APIC
+	if (virq  < nr_legacy_irqs())
+		legacy_irq_data[virq] = NULL;
+#endif
 	if (data) {
 		free_cpumask_var(data->domain);
 		free_cpumask_var(data->old_domain);
@@ -318,11 +322,7 @@ static void x86_vector_free_irqs(struct
 			apic_data = irq_data->chip_data;
 			irq_domain_reset_irq_data(irq_data);
 			raw_spin_unlock_irqrestore(&vector_lock, flags);
-			free_apic_chip_data(apic_data);
-#ifdef	CONFIG_X86_IO_APIC
-			if (virq + i < nr_legacy_irqs())
-				legacy_irq_data[virq + i] = NULL;
-#endif
+			free_apic_chip_data(virq + i, apic_data);
 		}
 	}
 }
@@ -363,7 +363,7 @@ static int x86_vector_alloc_irqs(struct
 		err = assign_irq_vector_policy(virq + i, node, data, info);
 		if (err) {
 			irq_data->chip_data = NULL;
-			free_apic_chip_data(data);
+			free_apic_chip_data(virq + i, data);
 			goto error;
 		}
 	}


Patches currently in stable-queue which might be from ben.hutchings@codethink.co.uk are

queue-4.9/x86-apic-vector-handle-legacy-irq-data-correctly.patch