Avoid kill with -1 argument.

The out_ctx label can be reached before fork has been called. If this
happens, then kill -1 would be called, sending SIGTERM to all processes
reachable by the current process.

From tobias@ and c3h2_ctf via github PR#286, ok djm@

diff --git a/usr.bin/ssh/readpass.c b/usr.bin/ssh/readpass.c
index 4a55e98..d94a21b 100644 (file)
--- a/usr.bin/ssh/readpass.c
+++ b/usr.bin/ssh/readpass.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: readpass.c,v 1.69 2021/07/23 05:56:47 djm Exp $ */
+/* $OpenBSD: readpass.c,v 1.70 2022/05/27 04:27:49 dtucker Exp $ */
 /*
  * Copyright (c) 2001 Markus Friedl.  All rights reserved.
  *
@@ -283,7 +283,8 @@ notify_start(int force_askpass, const char *fmt, ...)
        }
  out_ctx:
        if ((ret = calloc(1, sizeof(*ret))) == NULL) {
-               kill(pid, SIGTERM);
+               if (pid != -1)
+                       kill(pid, SIGTERM);
                fatal_f("calloc failed");
        }
        ret->pid = pid;