From: Thomas Abraham <tabraham@suse.com>
Date: Mon, 6 May 2019 18:26:14 +0000 (-0400)
Subject: lib/spawn.c run_command: don't loop forever if waitpid() is returning ECHILD
X-Git-Tag: 4.7~3^2
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=82fa6eccf9326f8002e7c969a0c06faffc3113f1;p=shadow

lib/spawn.c run_command: don't loop forever if waitpid() is returning ECHILD

If SIGCHILD is being ignored, waitpid() will forever error with ECHILD and
this loop with never end, so don't loop if it errors with ECHILD.
---

diff --git a/lib/spawn.c b/lib/spawn.c
index fc4ad95c..d0b5fb26 100644
--- a/lib/spawn.c
+++ b/lib/spawn.c
@@ -68,6 +68,8 @@ int run_command (const char *cmd, const char *argv[],
 
 	do {
 		wpid = waitpid (pid, status, 0);
+		if ((pid_t)-1 == wpid && errno == ECHILD)
+			break;
 	} while (   ((pid_t)-1 == wpid && errno == EINTR)
 	         || ((pid_t)-1 != wpid && wpid != pid));