Fix to check double free of insn_slot at arch_remove_kprobe
as other arches do.
Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@xxxxxxxxxxx>
Cc: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
Cc: David Daney <ddaney@xxxxxxxxxxxxxxxxxx>
Cc: Maneesh Soni <manesoni@xxxxxxxxx>
Cc: Victor Kamensky <kamensky@xxxxxxxxx>
Cc: linux-mips@xxxxxxxxxxxxxx
---
arch/mips/kernel/kprobes.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/arch/mips/kernel/kprobes.c b/arch/mips/kernel/kprobes.c
index 12bc4eb..1f8187a 100644
--- a/arch/mips/kernel/kprobes.c
+++ b/arch/mips/kernel/kprobes.c
@@ -207,7 +207,10 @@ void __kprobes arch_disarm_kprobe(struct kprobe *p)
void __kprobes arch_remove_kprobe(struct kprobe *p)
{
- free_insn_slot(p->ainsn.insn, 0);
+ if (p->ainsn.insn) {
+ free_insn_slot(p->ainsn.insn, 0);
+ p->ainsn.insn = NULL;
+ }
}
static void save_previous_kprobe(struct kprobe_ctlblk *kcb)
