linux-kernel - [PATCH -mm] bugfix: release old_p's insn

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Date:	Wed, 19 Nov 2008 18:02:29 -0500
From:	Masami Hiramatsu <mhiramat@...hat.com>
To:	akpm@...ux-foundation.org
CC:	mm-commits@...r.kernel.org, ananth@...ibm.com,
	anil.s.keshavamurthy@...el.com, Jim Keniston <jkenisto@...ibm.com>,
	LKML <linux-kernel@...r.kernel.org>,
	systemtap-ml <systemtap@...rces.redhat.com>
Subject: [PATCH -mm] bugfix: release old_p's insn_slot before error return

Hi Andrew,

akpm@...ux-foundation.org wrote:
> The patch titled
>      bugfix: pass aggr_kprobe to arch_remove_kprobe
> has been added to the -mm tree.  Its filename is
>      kprobes-support-probing-module-__exit-function-fix-2.patch

Oops, sorry, I found one another bug...

Release old_p->ainsn.insn_slot before error return, if the memory
allocation of new aggr_kprobe is failed.

Signed-off-by: Masami Hiramatsu  <mhiramat@...hat.com>
Cc: Ananth N Mavinakayanahalli <ananth@...ibm.com>
---
 kernel/kprobes.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

Index: 2.6.28-rc4/kernel/kprobes.c
===================================================================
--- 2.6.28-rc4.orig/kernel/kprobes.c
+++ 2.6.28-rc4/kernel/kprobes.c
@@ -584,8 +584,11 @@ static int __kprobes register_aggr_kprob
 		ap = old_p;
 	} else {
 		ap = kzalloc(sizeof(struct kprobe), GFP_KERNEL);
-		if (!ap)
+		if (!ap) {
+			if (kprobe_gone(old_p))
+				arch_remove_kprobe(old_p);
 			return -ENOMEM;
+		}
 		add_aggr_kprobe(ap, old_p);
 		copy_kprobe(ap, p);
 		ret = add_new_kprobe(ap, p);


-- 
Masami Hiramatsu

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

e-mail: mhiramat@...hat.com

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