From: Marcelo Diop-Gonzalez <marcgonzalez@google.com>
To: Dan Carpenter <dan.carpenter@oracle.com>
Cc: devel@driverdev.osuosl.org, Greg KH <gregkh@linuxfoundation.org>,
linux-rpi-kernel@lists.infradead.org,
Stefan Wahren <wahrenst@gmx.net>,
eric@anholt.net
Subject: Re: [PATCH 3/3] staging: vchiq: Have vchiq_dump_* functions return an error code
Date: Thu, 21 Nov 2019 16:25:20 -0500 [thread overview]
Message-ID: <CAKvFj6q8wrnmWBqnw8btYwoFzF4dkL2+L2EzBytR+PiVu5sFxQ@mail.gmail.com> (raw)
In-Reply-To: <20191120185047.GE5604@kadam>
On Wed, Nov 20, 2019 at 1:51 PM Dan Carpenter <dan.carpenter@oracle.com> wrote:
>
> Thanks for the patch. Looks good.
>
> Reviewed-by: Dan Carpenter <dan.carpenter@oracle.com>
Appreciate the review!
-Marcelo
>
> On Wed, Nov 20, 2019 at 10:36:48AM -0500, Marcelo Diop-Gonzalez wrote:
> > copy_bytes = min_t(int, len, context->space - context->actual);
> > if (copy_bytes == 0)
> > - return;
> > + return 0;
> > if (copy_to_user(context->buf + context->actual, str,
> > copy_bytes))
> > - context->actual = -EFAULT;
> ^^^^^^^^^^^^^^^^^^^^^^^^^
>
> > + return -EFAULT;
> > context->actual += copy_bytes;
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>
> In the original code we saved the error code to context->actual, then
> we added some bytes
>
> > len -= copy_bytes;
> >
> > @@ -2109,8 +2108,9 @@ vchiq_dump(void *dump_context, const char *str, int len)
> >
> > if (copy_to_user(context->buf + context->actual - 1,
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> and then we tried to use the result to corrupt the user space program.
> So this patch is a nice bug fix.
>
> > &cr, 1))
> > - context->actual = -EFAULT;
> > + return -EFAULT;
> > }
> > + return 0;
> > }
>
> regards,
> dan carpenter
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next prev parent reply other threads:[~2019-11-21 21:25 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-20 15:36 [PATCH 0/3] staging: vchiq: Fix vchiq_read return value in case of error Marcelo Diop-Gonzalez
2019-11-20 15:36 ` [PATCH 1/3] staging: vchiq_dump: Replace min with min_t Marcelo Diop-Gonzalez
2019-11-20 15:46 ` Greg KH
2019-11-20 15:36 ` [PATCH 2/3] staging: vchiq: Refactor indentation in vchiq_dump_* functions Marcelo Diop-Gonzalez
2019-11-20 15:36 ` [PATCH 3/3] staging: vchiq: Have vchiq_dump_* functions return an error code Marcelo Diop-Gonzalez
2019-11-20 18:50 ` Dan Carpenter
2019-11-21 21:25 ` Marcelo Diop-Gonzalez [this message]
2019-11-20 20:20 ` [PATCH v2 0/4] staging: vchiq: Fix vchiq_read return value in case of error Marcelo Diop-Gonzalez
2019-11-20 20:20 ` [PATCH v2 1/4] staging: vchiq: Fix block comment format in vchiq_dump() Marcelo Diop-Gonzalez
2019-11-20 20:21 ` [PATCH v2 2/4] staging: vchiq_dump: Replace min with min_t Marcelo Diop-Gonzalez
2019-11-20 20:21 ` [PATCH v2 3/4] staging: vchiq: Refactor indentation in vchiq_dump_* functions Marcelo Diop-Gonzalez
2019-11-20 20:21 ` [PATCH v2 4/4] staging: vchiq: Have vchiq_dump_* functions return an error code Marcelo Diop-Gonzalez
2019-11-21 19:38 ` [PATCH v2 0/4] staging: vchiq: Fix vchiq_read return value in case of error Nicolas Saenz Julienne
2019-11-21 21:24 ` Marcelo Diop-Gonzalez
2019-11-21 10:42 ` [PATCH 0/3] " Stefan Wahren
2019-11-21 19:41 ` Nicolas Saenz Julienne
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