lguest: fix out-by-one error in address checking.

[cascardo/linux.git] / drivers / lguest / core.c

diff --git a/drivers/lguest/core.c b/drivers/lguest/core.c
index 7dc93aa..312ffd3 100644 (file)
--- a/drivers/lguest/core.c
+++ b/drivers/lguest/core.c
@@ -173,7 +173,7 @@ static void unmap_switcher(void)
 bool lguest_address_ok(const struct lguest *lg,
                       unsigned long addr, unsigned long len)
 {
-       return (addr+len) / PAGE_SIZE < lg->pfn_limit && (addr+len >= addr);
+       return addr+len <= lg->pfn_limit * PAGE_SIZE && (addr+len >= addr);
 }
 
 /*