From a052b68b1e7a31f1e6a721290035e9deb0f6fed9 Mon Sep 17 00:00:00 2001 From: Andrew Morton Date: Wed, 28 Jun 2006 04:26:43 -0700 Subject: [PATCH] [PATCH] x86: do_IRQ(): check irq number We recently changed x86 to handle more than 256 IRQs. Add a check in do_IRQ() just to make sure that nothing went wrong with that implementation. [chrisw@sous-sol.org: do x86_64 too] Cc: Ingo Molnar Cc: Thomas Gleixner Cc: Rusty Russell Cc: Andi Kleen Cc: Chris Wright Cc: "Protasevich, Natalie" Cc: Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/i386/kernel/irq.c | 6 ++++++ arch/x86_64/kernel/irq.c | 6 ++++++ 2 files changed, 12 insertions(+) diff --git a/arch/i386/kernel/irq.c b/arch/i386/kernel/irq.c index c703bc7b088..9eec9435318 100644 --- a/arch/i386/kernel/irq.c +++ b/arch/i386/kernel/irq.c @@ -60,6 +60,12 @@ fastcall unsigned int do_IRQ(struct pt_regs *regs) u32 *isp; #endif + if (unlikely((unsigned)irq >= NR_IRQS)) { + printk(KERN_EMERG "%s: cannot handle IRQ %d\n", + __FUNCTION__, irq); + BUG(); + } + irq_enter(); #ifdef CONFIG_DEBUG_STACKOVERFLOW /* Debugging check for stack overflow: is there less than 1KB free? */ diff --git a/arch/x86_64/kernel/irq.c b/arch/x86_64/kernel/irq.c index 3be0a7e4bf0..bfa82f52a5c 100644 --- a/arch/x86_64/kernel/irq.c +++ b/arch/x86_64/kernel/irq.c @@ -118,6 +118,12 @@ asmlinkage unsigned int do_IRQ(struct pt_regs *regs) /* high bit used in ret_from_ code */ unsigned irq = ~regs->orig_rax; + if (unlikely(irq >= NR_IRQS)) { + printk(KERN_EMERG "%s: cannot handle IRQ %d\n", + __FUNCTION__, irq); + BUG(); + } + exit_idle(); irq_enter(); #ifdef CONFIG_DEBUG_STACKOVERFLOW -- 2.20.1