[Xen-devel] [PATCH -next] x86/xen: Fix read buffer overflow

[YueHaibing <yuehaibing@xxxxxxxxxx>]

Fix smatch warning:

arch/x86/xen/enlighten_pv.c:649 get_trap_addr() error:
 buffer overflow 'early_idt_handler_array' 32 <= 32

Fixes: 42b3a4cb5609 ("x86/xen: Support early interrupts in xen pv guests")
Signed-off-by: YueHaibing <yuehaibing@xxxxxxxxxx>
---
 arch/x86/xen/enlighten_pv.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/xen/enlighten_pv.c b/arch/x86/xen/enlighten_pv.c
index 2f6787f..81f200d 100644
--- a/arch/x86/xen/enlighten_pv.c
+++ b/arch/x86/xen/enlighten_pv.c
@@ -646,7 +646,7 @@ static bool __ref get_trap_addr(void **addr, unsigned int 
ist)
 
        if (nr == ARRAY_SIZE(trap_array) &&
            *addr >= (void *)early_idt_handler_array[0] &&
-           *addr < (void *)early_idt_handler_array[NUM_EXCEPTION_VECTORS]) {
+           *addr < (void *)early_idt_handler_array[NUM_EXCEPTION_VECTORS - 1]) 
{
                nr = (*addr - (void *)early_idt_handler_array[0]) /
                     EARLY_IDT_HANDLER_SIZE;
                *addr = (void *)xen_early_idt_handler_array[nr];
-- 
2.7.0



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