git: 6f6c7b996719 - releng/15.0 - thr_kill2: Respect p_cansignal()

The branch releng/15.0 has been updated by markj:

URL: https://cgit.FreeBSD.org/src/commit/?id=6f6c7b99671987f2531e7dff8edb92bbc19d7eba

commit 6f6c7b99671987f2531e7dff8edb92bbc19d7eba
Author:     Mark Johnston <markj@FreeBSD.org>
AuthorDate: 2026-05-25 15:12:57 +0000
Commit:     Mark Johnston <markj@FreeBSD.org>
CommitDate: 2026-06-08 15:39:32 +0000

    thr_kill2: Respect p_cansignal()
    
    Approved by:    so
    Security:       FreeBSD-SA-26:25.thr
    Security:       CVE-2026-45256
    Reported by:    Igor Gabriel Sousa e Souza
    Reported by:    Yuxiang Yang, Yizhou Zhao, Ao Wang, Xuewei Feng, Qi Li, and Ke Xu from Tsinghua University using GLM-5.1 from Z.ai
    Reviewed by:    emaste, kib
    Sponsored by:   The FreeBSD Foundation
    Differential Revision:  https://reviews.freebsd.org/D57237
---
 sys/kern/kern_thr.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sys/kern/kern_thr.c b/sys/kern/kern_thr.c
index 4329959a2ef4..4a439eee0210 100644
--- a/sys/kern/kern_thr.c
+++ b/sys/kern/kern_thr.c
@@ -506,7 +506,7 @@ sys_thr_kill2(struct thread *td, struct thr_kill2_args *uap)
 		p = ttd->td_proc;
 		AUDIT_ARG_PROCESS(p);
 		error = p_cansignal(td, p, uap->sig);
-		if (uap->sig == 0)
+		if (error != 0 || uap->sig == 0)
 			;
 		else if (!_SIG_VALID(uap->sig))
 			error = EINVAL;