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Subject[PATCH -mm] bugfix: pass aggr_kprobe to arch_remove_kprobe
Hi Andrew,

akpm@linux-foundation.org wrote:
> The patch titled
> kprobes: support probing module __exit function
> has been added to the -mm tree. Its filename is
> kprobes-support-probing-module-__exit-function.patch

I found that one bug was still alive. Here is the bugfix.

Thank you,

Call arch_remove_kprobe() with aggr_kprobe instead of user specific kprobe,
because the user specific kprobe on the gone or reused aggr_kprobe may have
invalid arch_specific_insn.

Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com>
Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
---
kernel/kprobes.c | 14 +++++++-------
1 file changed, 7 insertions(+), 7 deletions(-)

Index: 2.6-rc/kernel/kprobes.c
===================================================================
--- 2.6-rc.orig/kernel/kprobes.c
+++ 2.6-rc/kernel/kprobes.c
@@ -766,14 +766,14 @@ static void __kprobes __unregister_kprob
{
struct kprobe *old_p;

- if (list_empty(&p->list) || list_is_singular(&p->list)) {
- if (!list_empty(&p->list)) {
- /* "p" is the last child of an aggr_kprobe */
- old_p = list_entry(p->list.next, struct kprobe, list);
- list_del(&p->list);
- kfree(old_p);
- }
+ if (list_empty(&p->list))
arch_remove_kprobe(p);
+ else if (list_is_singular(&p->list)) {
+ /* "p" is the last child of an aggr_kprobe */
+ old_p = list_entry(p->list.next, struct kprobe, list);
+ list_del(&p->list);
+ arch_remove_kprobe(old_p);
+ kfree(old_p);
}
}

--
Masami Hiramatsu

Software Engineer
Hitachi Computer Products (America) Inc.
Software Solutions Division

e-mail: mhiramat@redhat.com




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