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Date: Mon, 21 May 2012 11:49:59 -0500 From: Dimitri Sivanich <sivanich@....com> To: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org, Suresh Siddha <suresh.b.siddha@...el.com>, Yinghai Lu <yinghai@...nel.org>, Naga Chumbalkar <nagananda.chumbalkar@...com>, Jacob Pan <jacob.jun.pan@...ux.intel.com>, linux-kernel@...r.kernel.org Subject: [PATCH] x86: check for valid irq_cfg pointer in smp_irq_move_cleanup_interrupt The smp_irq_move_cleanup_interrupt routine should be checking for a valid irq_cfg pointer prior to accessing it. It also seems that this should be done after taking the desc lock. Signed-off-by: Dimitri Sivanich <sivanich@....com> --- arch/x86/kernel/apic/io_apic.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) Index: linux/arch/x86/kernel/apic/io_apic.c =================================================================== --- linux.orig/arch/x86/kernel/apic/io_apic.c +++ linux/arch/x86/kernel/apic/io_apic.c @@ -2478,9 +2478,12 @@ asmlinkage void smp_irq_move_cleanup_int if (!desc) continue; - cfg = irq_cfg(irq); raw_spin_lock(&desc->lock); + cfg = irq_cfg(irq); + if (!cfg) + goto unlock; + /* * Check if the irq migration is in progress. If so, we * haven't received the cleanup request yet for this irq. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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