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Message-ID: <CAGXu5j+X1BrPhtdOP9AJ-oSovoHcS1CQHNsiFisdQt=Th7LgWw@mail.gmail.com>
Date: Thu, 7 Jun 2018 13:43:08 -0700
From: Kees Cook <keescook@...omium.org>
To: Matthew Wilcox <willy@...radead.org>
Cc: Matthew Wilcox <mawilcox@...rosoft.com>, Linux-MM <linux-mm@...ck.org>,
LKML <linux-kernel@...r.kernel.org>,
Kernel Hardening <kernel-hardening@...ts.openwall.com>
Subject: Re: [PATCH 1/6] Convert virtio_console to struct_size
On Thu, Jun 7, 2018 at 12:29 PM, Kees Cook <keescook@...omium.org> wrote:
> On Thu, Jun 7, 2018 at 7:57 AM, Matthew Wilcox <willy@...radead.org> wrote:
>> From: Matthew Wilcox <mawilcox@...rosoft.com>
>>
>> Signed-off-by: Matthew Wilcox <mawilcox@...rosoft.com>
>> ---
>> drivers/char/virtio_console.c | 3 +--
>> 1 file changed, 1 insertion(+), 2 deletions(-)
>>
>> diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c
>> index 21085515814f..4bf7c06c2343 100644
>> --- a/drivers/char/virtio_console.c
>> +++ b/drivers/char/virtio_console.c
>> @@ -433,8 +433,7 @@ static struct port_buffer *alloc_buf(struct virtio_device *vdev, size_t buf_size
>> * Allocate buffer and the sg list. The sg list array is allocated
>> * directly after the port_buffer struct.
>> */
>> - buf = kmalloc(sizeof(*buf) + sizeof(struct scatterlist) * pages,
>> - GFP_KERNEL);
>> + buf = kmalloc(struct_size(buf, sg, pages), GFP_KERNEL);
>> if (!buf)
>> goto fail;
>
> I feel like this one should have been caught by Coccinelle... maybe
> the transitive case got missed? Regardless, I'll figure out how to
> improve the script and/or take these.
Oh, duh. Got it: "struct scatterlist" is not an expression, it's a
type. I'll adjust the script, catch stragglers, and incorporate your
patches. :)
Thanks!
-Kees
--
Kees Cook
Pixel Security
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