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[PATCH] Kprobes: Oops! in unregister_kprobe()

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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@in.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Prasanna S Panchamukhi 2005-05-05 16:15:41 -07:00 committed by Linus Torvalds
parent 0b9e2cac8a
commit 04dea5f932
1 changed files with 5 additions and 1 deletions
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6
kernel/kprobes.c
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@ -107,13 +107,17 @@ rm_kprobe:
void unregister_kprobe(struct kprobe *p) void unregister_kprobe(struct kprobe *p)
{ {
unsigned long flags; unsigned long flags;
arch_remove_kprobe(p);
spin_lock_irqsave(&kprobe_lock, flags); spin_lock_irqsave(&kprobe_lock, flags);
if (!get_kprobe(p->addr)) {
spin_unlock_irqrestore(&kprobe_lock, flags);
return;
}
*p->addr = p->opcode; *p->addr = p->opcode;
hlist_del(&p->hlist); hlist_del(&p->hlist);
flush_icache_range((unsigned long) p->addr, flush_icache_range((unsigned long) p->addr,
(unsigned long) p->addr + sizeof(kprobe_opcode_t)); (unsigned long) p->addr + sizeof(kprobe_opcode_t));
spin_unlock_irqrestore(&kprobe_lock, flags); spin_unlock_irqrestore(&kprobe_lock, flags);
arch_remove_kprobe(p);
} }
static struct notifier_block kprobe_exceptions_nb = { static struct notifier_block kprobe_exceptions_nb = {