Merge tag 'sched-urgent-2026-01-11' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

torvalds · torvalds · commit fac4bdbacab5 · 2026-01-11T07:11:53.000-10:00
Pull scheduler fix from Ingo Molnar:
 "Fix a crash in sched_mm_cid_after_execve()"

* tag 'sched-urgent-2026-01-11' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  sched/mm_cid: Prevent NULL mm dereference in sched_mm_cid_after_execve()
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
@@ -10694,10 +10694,11 @@ void sched_mm_cid_before_execve(struct task_struct *t)
 	sched_mm_cid_exit(t);
 }
 
-/* Reactivate MM CID after successful execve() */
+/* Reactivate MM CID after execve() */
 void sched_mm_cid_after_execve(struct task_struct *t)
 {
-	sched_mm_cid_fork(t);
+	if (t->mm)
+		sched_mm_cid_fork(t);
 }
 
 static void mm_cid_work_fn(struct work_struct *work)

Original file line number	Diff line number	Diff line change
`@@ -10694,10 +10694,11 @@ void sched_mm_cid_before_execve(struct task_struct *t)`
`10694`	`10694`	`sched_mm_cid_exit(t);`
`10695`	`10695`	`}`
`10696`	`10696`
`10697`		`-/* Reactivate MM CID after successful execve() */`
	`10697`	`+/* Reactivate MM CID after execve() */`
`10698`	`10698`	`void sched_mm_cid_after_execve(struct task_struct *t)`
`10699`	`10699`	`{`
`10700`		`- sched_mm_cid_fork(t);`
	`10700`	`+ if (t->mm)`
	`10701`	`+ sched_mm_cid_fork(t);`
`10701`	`10702`	`}`
`10702`	`10703`
`10703`	`10704`	`static void mm_cid_work_fn(struct work_struct *work)`