[PATCH] Kprobes: Oops! in unregister_kprobe()

[Prasanna S Panchamukhi]

Hi,

Please find the patch below to fix Oops! in unregister_kprobe().
Please let me know if you any issues.

Thanks
Prasanna


kernel oops! when unregister_kprobe() is called on a non-registered
kprobe. This patch fixes the above problem by checking if the probe exists
before unregistering.

Signed-off-by: Prasanna S Panchamukhi <prasanna@xxxxxxxxxx>


---

 linux-2.6.12-rc2-prasanna/kernel/kprobes.c |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletion(-)

diff -puN kernel/kprobes.c~kprobes-unregister-oops-fix kernel/kprobes.c
--- linux-2.6.12-rc2/kernel/kprobes.c~kprobes-unregister-oops-fix	2005-04-11 17:23:34.000000000 +0530
+++ linux-2.6.12-rc2-prasanna/kernel/kprobes.c	2005-04-11 17:32:50.000000000 +0530
@@ -110,13 +110,17 @@ rm_kprobe:
 void unregister_kprobe(struct kprobe *p)
 {
 	unsigned long flags;
-	arch_remove_kprobe(p);
 	spin_lock_irqsave(&kprobe_lock, flags);
+	if (!get_kprobe(p->addr)) {
+		spin_unlock_irqrestore(&kprobe_lock, flags);
+		return;
+	}
 	*p->addr = p->opcode;
 	hlist_del(&p->hlist);
 	flush_icache_range((unsigned long) p->addr,
 			   (unsigned long) p->addr + sizeof(kprobe_opcode_t));
 	spin_unlock_irqrestore(&kprobe_lock, flags);
+	arch_remove_kprobe(p);
 }
 
 

_
-- 

Prasanna S Panchamukhi
Linux Technology Center
India Software Labs, IBM Bangalore
Ph: 91-80-25044636
<prasanna@xxxxxxxxxx>
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