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csky/kprobe: reclaim insn_slot on kprobe unregistration 

[ Upstream commit a2310c74d4 ]

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>
This commit is contained in:
Liao Chang 2022-05-25 16:02:41 +08:00 committed by Greg Kroah-Hartman
parent 0a5e36832f
commit e0cd4d17ce
1 changed files with 4 additions and 0 deletions
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4
arch/csky/kernel/probes/kprobes.c
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@ -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)