s390/unwind: avoid int overflow in outside_of_stack

When current task is interrupted in-between stack frame allocation
and backchain write instructions new stack frame backchain pointer
is left uninitialized. That invalid backchain value is passed into
outside_of_stack for sanity check. Make sure int overflow does not happen
by subtracting stack_frame size from the stack "end" rather than adding
it to "random" backchain value.

Fixes: 41b0474c1b1c ("s390/unwind: introduce stack unwind API")
Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>

diff --git a/arch/s390/kernel/unwind_bc.c b/arch/s390/kernel/unwind_bc.c
index 3ce8a0808059b634c2b326a82d2e0c9237dd7173..8fc9daae47a2ee89a25161ff9775673ee9f37dd8 100644 (file)
--- a/arch/s390/kernel/unwind_bc.c
+++ b/arch/s390/kernel/unwind_bc.c
@@ -20,7 +20,7 @@ EXPORT_SYMBOL_GPL(unwind_get_return_address);
 static bool outside_of_stack(struct unwind_state *state, unsigned long sp)
 {
        return (sp <= state->sp) ||
-               (sp + sizeof(struct stack_frame) > state->stack_info.end);
+               (sp > state->stack_info.end - sizeof(struct stack_frame));
 }
 
 static bool update_stack_info(struct unwind_state *state, unsigned long sp)