linux-kernel - [GIT PULL] IRQ fix

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Date:   Thu, 12 Sep 2019 10:35:03 +0200
From:   Ingo Molnar <mingo@...nel.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: [GIT PULL] IRQ fix

Linus,

Please pull the latest irq-urgent-for-linus git tree from:

   git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git irq-urgent-for-linus

   # HEAD: eddf3e9c7c7e4d0707c68d1bb22cc6ec8aef7d4a genirq: Prevent NULL pointer dereference in resend_irqs()

Fix a race in the IRQ resend mechanism, which can result in a NULL 
dereference crash.

 Thanks,

	Ingo

------------------>
Yunfeng Ye (1):
      genirq: Prevent NULL pointer dereference in resend_irqs()


 kernel/irq/resend.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/irq/resend.c b/kernel/irq/resend.c
index 95414ad3506a..98c04ca5fa43 100644
--- a/kernel/irq/resend.c
+++ b/kernel/irq/resend.c
@@ -36,6 +36,8 @@ static void resend_irqs(unsigned long arg)
 		irq = find_first_bit(irqs_resend, nr_irqs);
 		clear_bit(irq, irqs_resend);
 		desc = irq_to_desc(irq);
+		if (!desc)
+			continue;
 		local_irq_disable();
 		desc->handle_irq(desc);
 		local_irq_enable();