Fix waitid si_code regression

In commit ee7c82da830ea860b1f9274f1f0cdf99f206e7c2 ("wait_task_stopped:
simplify and fix races with SIGCONT/SIGKILL/untrace"), the magic (short)
cast when storing si_code was lost in wait_task_stopped.  This leaks the
in-kernel CLD_* values that do not match what userland expects.

Signed-off-by: Roland McGrath <roland@redhat.com>
Cc: Oleg Nesterov <oleg@tv-sign.ru>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/kernel/exit.c b/kernel/exit.c
index cd20bf07e9e3..53872bf993fa 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -1378,7 +1378,7 @@ unlock_sig:
         if (!retval && infop)
                 retval = put_user(0, &infop->si_errno);
         if (!retval && infop)
-                retval = put_user(why, &infop->si_code);
+                retval = put_user((short)why, &infop->si_code);
         if (!retval && infop)
                 retval = put_user(exit_code, &infop->si_status);
         if (!retval && infop)