From 956fb53197f82257974f1f9835485aeeef4510b3 Mon Sep 17 00:00:00 2001 From: Adrian Bunk Date: Thu, 7 Dec 2006 02:14:11 +0100 Subject: [PATCH] [PATCH] i386: handle a negative return value The Coverity checker noted that bad things might happen if find_isa_irq_apic() returned -1. [akpm@osdl.org: add debugging checks] Signed-off-by: Adrian Bunk Signed-off-by: Andi Kleen Cc: Andi Kleen Acked-by: Ingo Molnar Signed-off-by: Andrew Morton --- arch/i386/kernel/io_apic.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/arch/i386/kernel/io_apic.c b/arch/i386/kernel/io_apic.c index 993150f206ed..7bfd6c3ec87d 100644 --- a/arch/i386/kernel/io_apic.c +++ b/arch/i386/kernel/io_apic.c @@ -2179,9 +2179,15 @@ static inline void unlock_ExtINT_logic(void) unsigned char save_control, save_freq_select; pin = find_isa_irq_pin(8, mp_INT); + if (pin == -1) { + WARN_ON_ONCE(1); + return; + } apic = find_isa_irq_apic(8, mp_INT); - if (pin == -1) + if (apic == -1) { + WARN_ON_ONCE(1); return; + } entry0 = ioapic_read_entry(apic, pin); clear_IO_APIC_pin(apic, pin); -- 2.39.2