linux-kernel - [PATCH AUTOSEL 5.19 49/64] csky/kprobe: reclaim insn

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Date:   Sun, 14 Aug 2022 11:24:22 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Liao Chang <liaochang1@...wei.com>,
        Chen Guokai <chenguokai17@...ls.ucas.ac.cn>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Guo Ren <guoren@...nel.org>, Sasha Levin <sashal@...nel.org>,
        rostedt@...dmis.org, julia.lawall@...ia.fr,
        akpm@...ux-foundation.org, lkp@...el.com,
        linux-csky@...r.kernel.org
Subject: [PATCH AUTOSEL 5.19 49/64] csky/kprobe: reclaim insn_slot on kprobe unregistration

From: Liao Chang <liaochang1@...wei.com>

[ Upstream commit a2310c74d418deca0f1d749c45f1f43162510f51 ]

On kprobe registration kernel allocate one insn_slot for new kprobe,
but it forget to reclaim the insn_slot on unregistration, leading to a
potential leakage.

Reported-by: Chen Guokai <chenguokai17@...ls.ucas.ac.cn>
Reviewed-by: Masami Hiramatsu (Google) <mhiramat@...nel.org>
Signed-off-by: Liao Chang <liaochang1@...wei.com>
Signed-off-by: Guo Ren <guoren@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 arch/csky/kernel/probes/kprobes.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/csky/kernel/probes/kprobes.c b/arch/csky/kernel/probes/kprobes.c
index 34ba684d5962..3c6e5c725d81 100644
--- a/arch/csky/kernel/probes/kprobes.c
+++ b/arch/csky/kernel/probes/kprobes.c
@@ -124,6 +124,10 @@ void __kprobes arch_disarm_kprobe(struct kprobe *p)
 
 void __kprobes arch_remove_kprobe(struct kprobe *p)
 {
+	if (p->ainsn.api.insn) {
+		free_insn_slot(p->ainsn.api.insn, 0);
+		p->ainsn.api.insn = NULL;
+	}
 }
 
 static void __kprobes save_previous_kprobe(struct kprobe_ctlblk *kcb)
-- 
2.35.1