git: 588bb16e7bb8 - stable/15 - jail: fix crash with startup commands on a jail without name

The branch stable/15 has been updated by zlei:

URL: https://cgit.FreeBSD.org/src/commit/?id=588bb16e7bb842a1ad551c7814eb96978245995a

commit 588bb16e7bb842a1ad551c7814eb96978245995a
Author:     Gleb Smirnoff <glebius@FreeBSD.org>
AuthorDate: 2026-03-13 20:21:26 +0000
Commit:     Zhenlei Huang <zlei@FreeBSD.org>
CommitDate: 2026-04-22 15:59:32 +0000

    jail: fix crash with startup commands on a jail without name
    
    Jail name is optional, thus don't try setenv(NULL).
    
    Fixes:  d8f021add40c321c4578da55dae52fb93c7ccb5f
    (cherry picked from commit 78c4f821f43d530ba1f2a6308a64a8483208ebe3)
---
 usr.sbin/jail/command.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/usr.sbin/jail/command.c b/usr.sbin/jail/command.c
index 9da4fe51673a..8a1d281eff4f 100644
--- a/usr.sbin/jail/command.c
+++ b/usr.sbin/jail/command.c
@@ -814,8 +814,8 @@ run_command(struct cfjail *j)
 	if (!injail) {
 		if (string_param(j->intparams[KP_JID]))
 			setenv("JID", string_param(j->intparams[KP_JID]), 1);
-		setenv("JNAME", string_param(j->intparams[KP_NAME]), 1);
-
+		if (string_param(j->intparams[KP_NAME]))
+			setenv("JNAME", string_param(j->intparams[KP_NAME]), 1);
 		path = string_param(j->intparams[KP_PATH]);
 		setenv("JPATH", path ? path : "", 1);
 	}