From: Liao Chang liaochang1@huawei.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@mails.ucas.ac.cn Reviewed-by: Masami Hiramatsu (Google) mhiramat@kernel.org Signed-off-by: Liao Chang liaochang1@huawei.com Signed-off-by: Guo Ren guoren@kernel.org Signed-off-by: Sasha Levin sashal@kernel.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 556b9ba61ec0..79272dde72db 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)