From: Aristeu Rozanski <aris@redhat.com>
To: Steven Hardy <shardy@redhat.com>
Cc: gregkh@suse.de, mjg@redhat.com, linux-usb@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [GIT PATCH] Fix memory leak in qcserial driver
Date: Mon, 28 Mar 2011 13:54:48 -0400 [thread overview]
Message-ID: <20110328175448.GR2526@redhat.com> (raw)
In-Reply-To: <20110328174811.GD7030@shardy.csb>
On Mon, Mar 28, 2011 at 06:48:11PM +0100, Steven Hardy wrote:
> On Mon, Mar 28, 2011 at 01:34:24PM -0400, Aristeu Rozanski wrote:
> > > + usb_set_serial_data(serial, data);
> > > return retval;
> > > }
> > when there's a -ENODEV, kfree() is called but the now invalid address is
> > set by usb_set_serial_data() anyway. am I missing something here?
>
> The intention here is that since data should be NULL after the kfree, we're simply setting serial->private to NULL.
kfree(data) won't make data == NULL. it'll free whatever address data
has. data will still have the same (now stale) address. you need to
explicitely make data = NULL if you want that behavior.
--
Aristeu
next prev parent reply other threads:[~2011-03-28 17:54 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-03-28 14:06 [GIT PATCH] Fix memory leak in qcserial driver Steven Hardy
2011-03-28 14:21 ` Greg KH
2011-03-28 17:33 ` [GIT PATCH 1/3] Resend : " Steven Hardy
2011-03-28 17:38 ` [GIT PATCH 2/3] " Steven Hardy
2011-03-29 11:22 ` Sergei Shtylyov
2011-03-28 17:41 ` [GIT PATCH 3/3] " Steven Hardy
2011-03-28 22:16 ` [GIT PATCH 2/3 (2nd draft)] " Steven Hardy
2011-03-29 11:26 ` Sergei Shtylyov
2011-04-04 16:57 ` [PATCH 1/3] usb: Fix qcserial memory leak on rmmod Steven Hardy
2011-04-04 16:59 ` [PATCH 2/3] usb: qcserial avoid pointing to freed memory Steven Hardy
2011-04-04 17:02 ` [PATCH 3/3] usb: qcserial add missing errorpath kfrees Steven Hardy
2011-03-29 13:22 ` [GIT PATCH 2/3 (2nd draft)] Resend : Fix memory leak in qcserial driver Aristeu Rozanski
2011-03-28 17:34 ` [GIT PATCH] " Aristeu Rozanski
2011-03-28 17:48 ` Steven Hardy
2011-03-28 17:54 ` Aristeu Rozanski [this message]
2011-03-28 20:42 ` Steven Hardy
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