From 20424d85f8a07090fd32c6fad343f91b63c730b0 Mon Sep 17 00:00:00 2001 From: Andreas Larsson Date: Tue, 30 Oct 2012 00:09:46 +0000 Subject: [PATCH] sparc32, leon: Check for existent irq_map entry in leon_handle_ext_irq If an irq is being unlinked concurrently with leon_handle_ext_irq, irq_map[eirq] might be null in leon_handle_ext_irq. Make sure that this is not dereferenced. Signed-off-by: Andreas Larsson Acked-by: Sam Ravnborg Signed-off-by: David S. Miller --- arch/sparc/kernel/leon_kernel.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/arch/sparc/kernel/leon_kernel.c b/arch/sparc/kernel/leon_kernel.c index f8b6eee40bd..87f60ee6543 100644 --- a/arch/sparc/kernel/leon_kernel.c +++ b/arch/sparc/kernel/leon_kernel.c @@ -56,11 +56,13 @@ static inline unsigned int leon_eirq_get(int cpu) static void leon_handle_ext_irq(unsigned int irq, struct irq_desc *desc) { unsigned int eirq; + struct irq_bucket *p; int cpu = sparc_leon3_cpuid(); eirq = leon_eirq_get(cpu); - if ((eirq & 0x10) && irq_map[eirq]->irq) /* bit4 tells if IRQ happened */ - generic_handle_irq(irq_map[eirq]->irq); + p = irq_map[eirq]; + if ((eirq & 0x10) && p && p->irq) /* bit4 tells if IRQ happened */ + generic_handle_irq(p->irq); } /* The extended IRQ controller has been found, this function registers it */ -- 2.20.1