linux-kernel - Re: [BUG] 2.6.22-rc3-mm1 remove bluetooth usb adapter caused kmalloc bug

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Date:	Wed, 6 Jun 2007 05:55:56 +0000
From:	"young dave" <hidave.darkstar@...il.com>
To:	"Christoph Lameter" <clameter@....com>
Cc:	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>
Subject: Re: [BUG] 2.6.22-rc3-mm1 remove bluetooth usb adapter caused kmalloc bug

Hi,
>2007/6/6, Christoph Lameter <clameter@....com>:
> Note that the corruption seems to have its cause in a decrement done at
> offset 16 into the object pointing to the refcount in struct hci_dev. So
> it looks like the refcount was decremented after the object was freed.
>
> sysfs related?
>
I noticed in hci_core.c:

hci_dev_close call hci_dev_do_close , then call hci_dev_put

but in hci_dev_do_close  also call hci_dev_put

Maybe this is the reason, by apply the below patch the bug seems
doesn't exist,  but the strange thing is the 2.4.22-rc4 seems works, I
will test once more to see the result.

Signed-off-by: dave young <hidave.darkstar@...il.com>
---
 net/bluetooth/hci_core.c |    1 -
 1 file changed, 1 deletion(-)

diff -dur linux/net/bluetooth/hci_core.c linux.new/net/bluetooth/hci_core.c
--- linux/net/bluetooth/hci_core.c      2007-06-06 13:47:14.000000000 +0000
+++ linux.new/net/bluetooth/hci_core.c  2007-06-06 13:46:58.000000000 +0000
@@ -577,7 +577,6 @@

        hci_req_unlock(hdev);

-       hci_dev_put(hdev);
        return 0;
 }

Regards
dave
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