kprobes/mips: Fix to check double free of insn slot

[pandora-kernel.git] / arch / mips / kernel / kprobes.c

diff --git a/arch/mips/kernel/kprobes.c b/arch/mips/kernel/kprobes.c
index 12bc4eb..1f8187a 100644 (file)
--- 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)