x86/mm: Fix range check in tlbflush debugfs interface

[linux-2.6-block.git] / arch / x86 / mm / tlb.c

diff --git a/arch/x86/mm/tlb.c b/arch/x86/mm/tlb.c
index 613cd83e8c0cf424bbf627973fb4af54634d8e8e..a085c560b4a53367ffcb47ee6494e33124a44ff2 100644 (file)
--- a/arch/x86/mm/tlb.c
+++ b/arch/x86/mm/tlb.c
@@ -320,7 +320,7 @@ static ssize_t tlbflush_write_file(struct file *file,
        if (kstrtos8(buf, 0, &shift))
                return -EINVAL;
 
-       if (shift > 64)
+       if (shift < -1 || shift >= BITS_PER_LONG)
                return -EINVAL;
 
        tlb_flushall_shift = shift;