1 files changed, 5 insertions, 2 deletions

diff --git a/drivers/lguest/interrupts_and_traps.c b/drivers/lguest/interrupts_and_traps.c
index 49aa55577d0d..39731232d827 100644
--- a/drivers/lguest/interrupts_and_traps.c
+++ b/drivers/lguest/interrupts_and_traps.c
@@ -270,8 +270,11 @@ void pin_stack_pages(struct lguest *lg)
         /* Depending on the CONFIG_4KSTACKS option, the Guest can have one or
          * two pages of stack space. */
         for (i = 0; i < lg->stack_pages; i++)
-                /* The stack grows *upwards*, hence the subtraction */
-                pin_page(lg, lg->esp1 - i * PAGE_SIZE);
+                /* The stack grows *upwards*, so the address we're given is the
+                 * start of the page after the kernel stack.  Subtract one to
+                 * get back onto the first stack page, and keep subtracting to
+                 * get to the rest of the stack pages. */
+                pin_page(lg, lg->esp1 - 1 - i * PAGE_SIZE);
 }
 
 /* Direct traps also mean that we need to know whenever the Guest wants to use