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From 8b998d862e401c252c4323974698691e67846412 Mon Sep 17 00:00:00 2001
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From: Jan Synacek <jsynacek@redhat.com>
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Date: Tue, 15 Aug 2017 13:29:51 +0200
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Subject: [PATCH] udev: ignore SIGCHLD from unexpected processes (#1306539)
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RHEL-only
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Author: grzegorz.halat@motorolasolutions.com
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Resolves: #1306539
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---
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 src/udev/udev-event.c | 6 +++++-
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 1 file changed, 5 insertions(+), 1 deletion(-)
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diff --git a/src/udev/udev-event.c b/src/udev/udev-event.c
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index bc115f112..0ba079201 100644
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--- a/src/udev/udev-event.c
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+++ b/src/udev/udev-event.c
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@@ -610,7 +610,11 @@ static int spawn_wait(struct udev_event *event,
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                                 event->sigterm = true;
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                                 break;
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                         case SIGCHLD:
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-                                if (waitpid(pid, &status, WNOHANG) < 0)
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+                                if (pid != (pid_t) fdsi.ssi_pid) {
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+                                        log_debug("expected SIGCHLD from '%s' ["PID_FMT"] received from unknown process ["PID_FMT"]. Ignoring", cmd, pid, fdsi.ssi_pid);
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+                                        continue;
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+                                }
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+                                if (waitpid(pid, &status, WNOHANG) <= 0)
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                                         break;
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                                 if (WIFEXITED(status)) {
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                                         log_debug("'%s' ["PID_FMT"] exit with return code %i", cmd, pid, WEXITSTATUS(status));