This is a note to let you know that I've just added the patch titled
gpio: mpc8xxx: Prevent NULL pointer deref in demux handler
to the 3.3-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:
gpio-mpc8xxx-prevent-null-pointer-deref-in-demux-handler.patch
and it can be found in the queue-3.3 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 d6de85e85edcc38c9edcde45a0a568818fcddc13 Mon Sep 17 00:00:00 2001
From: Thomas Gleixner <t...@linutronix.de>
Date: Thu, 3 May 2012 12:22:06 +0200
Subject: gpio: mpc8xxx: Prevent NULL pointer deref in demux handler
From: Thomas Gleixner <t...@linutronix.de>
commit d6de85e85edcc38c9edcde45a0a568818fcddc13 upstream.
commit cfadd838(powerpc/8xxx: Fix interrupt handling in MPC8xxx GPIO
driver) added an unconditional call of chip->irq_eoi() to the demux
handler.
This leads to a NULL pointer derefernce on MPC512x platforms which use
this driver as well.
Make it conditional.
Reported-by: Thomas Wucher <thwuc...@linutronix.de>
Signed-off-by: Thomas Gleixner <t...@linutronix.de>
Cc: Felix Radensky <fe...@embedded-sol.com>
Cc: Kumar Gala <ga...@kernel.crashing.org>
Cc: Grant Likely <grant.lik...@secretlab.ca>
Signed-off-by: Grant Likely <grant.lik...@secretlab.ca>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
drivers/gpio/gpio-mpc8xxx.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/gpio/gpio-mpc8xxx.c
+++ b/drivers/gpio/gpio-mpc8xxx.c
@@ -163,7 +163,8 @@ static void mpc8xxx_gpio_irq_cascade(uns
if (mask)
generic_handle_irq(irq_linear_revmap(mpc8xxx_gc->irq,
32 - ffs(mask)));
- chip->irq_eoi(&desc->irq_data);
+ if (chip->irq_eoi)
+ chip->irq_eoi(&desc->irq_data);
}
static void mpc8xxx_irq_unmask(struct irq_data *d)
Patches currently in stable-queue which might be from t...@linutronix.de are
queue-3.3/powerpc-fix-broken-cpu_idle_wait-implementation.patch
queue-3.3/gpio-mpc8xxx-prevent-null-pointer-deref-in-demux-handler.patch
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