git: 73b576abf509 - stable/15 - kthread: Fix a thread leak

The branch stable/15 has been updated by markj:

URL: https://cgit.FreeBSD.org/src/commit/?id=73b576abf509f1cb057954937dd2809a5ba7a2dc

commit 73b576abf509f1cb057954937dd2809a5ba7a2dc
Author:     Mark Johnston <markj@FreeBSD.org>
AuthorDate: 2026-07-24 20:04:45 +0000
Commit:     Mark Johnston <markj@FreeBSD.org>
CommitDate: 2026-08-06 12:52:28 +0000

    kthread: Fix a thread leak
    
    Fixes:          963629923308 ("kthread_add(): do not allow to attach the thread to a dead or dying process")
    Reviewed by:    kib
    MFC after:      1 week
    Sponsored by:   The FreeBSD Foundation
    Differential Revision:  https://reviews.freebsd.org/D58433
    
    (cherry picked from commit c7917e72fe80e2e168b3812718b5fcd497c0e3b8)
---
 sys/kern/kern_kthread.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/sys/kern/kern_kthread.c b/sys/kern/kern_kthread.c
index cfe2dab2e05c..6650ab868f78 100644
--- a/sys/kern/kern_kthread.c
+++ b/sys/kern/kern_kthread.c
@@ -281,6 +281,7 @@ kthread_add1(void (*func)(void *), void *arg, struct proc *p,
 	PROC_LOCK(p);
 	if (p->p_state == PRS_ZOMBIE || (p->p_flag2 & P2_WEXIT) != 0) {
 		PROC_UNLOCK(p);
+		thread_free(newtd);
 		return (ESRCH);
 	}
 	oldtd = FIRST_THREAD_IN_PROC(p);