Author: kib
Date: Wed Nov 11 00:43:13 2020
New Revision: 367582
URL: https://svnweb.freebsd.org/changeset/base/367582
Log:
MFC r367120:
Check for process group change in tty_wait_background().
PR: 250701
Modified:
stable/12/sys/kern/tty.c
Directory Properties:
stable/12/ (props changed)
Modified: stable/12/sys/kern/tty.c
==============================================================================
--- stable/12/sys/kern/tty.c Tue Nov 10 23:25:16 2020 (r367581)
+++ stable/12/sys/kern/tty.c Wed Nov 11 00:43:13 2020 (r367582)
@@ -464,6 +464,19 @@ tty_wait_background(struct tty *tp, struct thread *td,
sig = 0;
}
PGRP_LOCK(pg);
+
+ /*
+ * pg may no longer be our process group.
+ * Re-check after locking process group.
+ */
+ PROC_LOCK(p);
+ if (p->p_pgrp != pg) {
+ PROC_UNLOCK(p);
+ PGRP_UNLOCK(pg);
+ continue;
+ }
+
+ PROC_UNLOCK(p);
pgsignal(pg, ksi.ksi_signo, 1, &ksi);
PGRP_UNLOCK(pg);
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