From ed22939428be3bd676e4261cf96e144c15d4e686 Mon Sep 17 00:00:00 2001
From: wangyuhang <wangyuhang27>
Date: Tue, 2 Apr 2024 15:44:35 +0800
Subject: [PATCH] solve the problem of dereference null return value when
 moving a job to the head of the linked list

---
 src/cmd/ksh93/sh/jobs.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/src/cmd/ksh93/sh/jobs.c b/src/cmd/ksh93/sh/jobs.c
index 5ad42c0..a46de01 100644
--- a/src/cmd/ksh93/sh/jobs.c
+++ b/src/cmd/ksh93/sh/jobs.c
@@ -1105,10 +1105,11 @@ int job_post(Shell_t *shp, pid_t pid, pid_t join) {
             val = job.curjobid;
         }
         // If job to join is not first move it to front.
-        if (val) {
+        if (val && job.pwlist) {
             pw = job_byjid(val);
-            assert(pw);
-            if (pw != job.pwlist) {
+            if (!pw)
+                errormsg(SH_DICT, ERROR_warn(0), "the job cannot be found in the linked list");
+            if (pw && (pw != job.pwlist)) {
                 job_unlink(pw);
                 pw->p_nxtjob = job.pwlist;
                 job.pwlist = pw;
-- 
2.33.0