[PATCH] uprobes: Free utask on dup_return_instance() failure
flat view
COLD53d
From: Keke Ming <hidden>
Date: 2026-08-22 05:46:40
Also in:
linux-perf-users, lkml
Subsystem:
performance events subsystem, the rest, uprobes · Maintainers:
Peter Zijlstra, Ingo Molnar, Arnaldo Carvalho de Melo, Namhyung Kim, Linus Torvalds, Masami Hiramatsu, Oleg Nesterov
dup_utask() installs the new uprobe_task in t->utask before copying return_instances. If dup_return_instance() fails, the partially copied utask is left attached to the child task. Free the partially copied utask before returning -ENOMEM. Signed-off-by: Keke Ming <redacted> --- kernel/events/uprobes.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
index b25531331902..0c8a664a0fe5 100644
--- a/kernel/events/uprobes.c
+++ b/kernel/events/uprobes.c@@ -2140,8 +2140,10 @@ static int dup_utask(struct task_struct *t, struct uprobe_task *o_utask) p = &n_utask->return_instances; for (o = o_utask->return_instances; o; o = o->next) { n = dup_return_instance(o); - if (!n) + if (!n) { + uprobe_free_utask(t); return -ENOMEM; + } /* if uprobe is non-NULL, we'll have an extra refcount for uprobe */ uprobe = hprobe_expire(&o->hprobe, true);
--
2.43.0