netdev - Re: [PATCH][next] bnxt_en: ensure len is ininitialized to zero

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Date:   Tue, 16 Jan 2018 10:23:18 +0000
From:   Colin Ian King <colin.king@...onical.com>
To:     Andy Gospodarek <andrew.gospodarek@...adcom.com>,
        Michael Chan <michael.chan@...adcom.com>
Cc:     Netdev <netdev@...r.kernel.org>, kernel-janitors@...r.kernel.org,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH][next] bnxt_en: ensure len is ininitialized to zero

On 12/01/18 22:38, Andy Gospodarek wrote:
> On Fri, Jan 12, 2018 at 10:11:17AM -0800, Michael Chan wrote:
>> On Fri, Jan 12, 2018 at 9:46 AM, Colin King <colin.king@...onical.com> wrote:
>>> From: Colin Ian King <colin.king@...onical.com>
>>>
>>> In the case where cmp_type == CMP_TYPE_RX_L2_TPA_START_CMP the
>>> exit return path is via label next_rx_no_prod and cpr->rx_bytes
>>> is being updated by an uninitialized value from len. Fix this by
>>> initializing len to zero.
>>>
>>> Detected by CoverityScan, CID#1463807 ("Uninitialized scalar variable")
>>>
>>> Fixes: 6a8788f25625 ("bnxt_en: add support for software dynamic interrupt moderation")
>>> Signed-off-by: Colin Ian King <colin.king@...onical.com>
>>> ---
>>>  drivers/net/ethernet/broadcom/bnxt/bnxt.c | 2 +-
>>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
>>> index cf6ebf1e324b..5b5c4f266f1b 100644
>>> --- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
>>> +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
>>> @@ -1482,7 +1482,7 @@ static int bnxt_rx_pkt(struct bnxt *bp, struct bnxt_napi *bnapi, u32 *raw_cons,
>>>         u32 tmp_raw_cons = *raw_cons;
>>>         u16 cfa_code, cons, prod, cp_cons = RING_CMP(tmp_raw_cons);
>>>         struct bnxt_sw_rx_bd *rx_buf;
>>> -       unsigned int len;
>>> +       unsigned int len = 0;
>>
>> It might be better to add a new label next_rx_no_prod_no_len and have
>> the TPA code paths jump there instead.
>>
>> Andy, what do you think?
>>
> 
> Yes, I think that would be a better fix.  Making the TPA vs not-TPA as
> explicit and intentional as possible seems like a good idea.

OK, new patch sent.
> 
>>>         u8 *data_ptr, agg_bufs, cmp_type;
>>>         dma_addr_t dma_addr;
>>>         struct sk_buff *skb;
>>> --
>>> 2.15.1
>>>
> --
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