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From: Kevin Traynor <ktraynor@redhat.com>
To: "Ferriter, Cian" <cian.ferriter@intel.com>,
	David Marchand <david.marchand@redhat.com>
Cc: dev <dev@dpdk.org>, dpdk stable <stable@dpdk.org>,
	"Yigit, Ferruh" <ferruh.yigit@intel.com>
Subject: Re: [dpdk-stable] [dpdk-dev] [PATCH 1/9] net/pcap: fix argument checks
Date: Wed, 6 Nov 2019 19:03:50 +0000
Message-ID: <8af40878-d916-adaf-af70-18aa9d32681d@redhat.com> (raw)
In-Reply-To: <579B86492DFB364BBA627A48FB30C90E75E01B95@IRSMSX102.ger.corp.intel.com>

On 05/11/2019 17:10, Ferriter, Cian wrote:
> 
> 
>> -----Original Message-----
>> From: Kevin Traynor <ktraynor@redhat.com>
>> Sent: Tuesday 5 November 2019 16:41
>> To: David Marchand <david.marchand@redhat.com>
>> Cc: dev <dev@dpdk.org>; Ferriter, Cian <cian.ferriter@intel.com>; dpdk
>> stable <stable@dpdk.org>; Yigit, Ferruh <ferruh.yigit@intel.com>
>> Subject: Re: [dpdk-dev] [PATCH 1/9] net/pcap: fix argument checks
>>
>> On 30/10/2019 07:52, David Marchand wrote:
>>> On Tue, Oct 1, 2019 at 2:54 PM Kevin Traynor <ktraynor@redhat.com>
>> wrote:
>>>>
>>>> Previously rx/tx_queues were passed into eth_from_pcaps_common() as
>>>> ptrs and were checked for being NULL.
>>>>
>>>> In commit da6ba28f0540 ("net/pcap: use a struct to pass user
>>>> options") that changed to pass in a ptr to a pmd_devargs_all which
>>>> contains the rx/tx_queues.
>>>>
>>>> The parameter checking was not updated as part of that commit and
>>>> coverity caught that there was still a check if rx/tx_queues were
>>>> NULL, apparently after they had been dereferenced.
>>>>
>>>> Fix that by checking the pmd_devargs_all ptr and removing the NULL
>>>> checks on rx/tx_queues.
>>>>
>>>> 1231        struct pmd_devargs *rx_queues = &devargs_all->rx_queues;
>>>> 1232        struct pmd_devargs *tx_queues = &devargs_all->tx_queues;
>>>> 1233        const unsigned int nb_rx_queues = rx_queues->num_of_queue;
>>>>     deref_ptr: Directly dereferencing pointer tx_queues.
>>>> 1234        const unsigned int nb_tx_queues = tx_queues->num_of_queue;
>>>> 1235        unsigned int i;
>>>> 1236
>>>> 1237        /* do some parameter checking */
>>>>     CID 345004: Dereference before null check (REVERSE_INULL)
>>>>     [select issue]
>>>> 1238        if (rx_queues == NULL && nb_rx_queues > 0)
>>>> 1239                return -1;
>>>>     CID 345029 (#1 of 1): Dereference before null check (REVERSE_INULL)
>>>>     check_after_deref: Null-checking tx_queues suggests that it may be
>>>>     null, but it has already been dereferenced on all paths leading to
>>>>     the check.
>>>> 1240        if (tx_queues == NULL && nb_tx_queues > 0)
>>>> 1241                return -1;
>>>>
>>>> Coverity issue: 345029
>>>> Coverity issue: 345044
>>>> Fixes: da6ba28f0540 ("net/pcap: use a struct to pass user options")
>>>> Cc: cian.ferriter@intel.com
>>>> Cc: stable@dpdk.org
>>>>
>>>> Signed-off-by: Kevin Traynor <ktraynor@redhat.com>
>>>
>>> This patch hides the coverity warning.
>>> But can't we just remove those checks?
>>>
>>> Iiuc, the checks on NULL pointers are unnecessary since
>>>
>> https://git.dpdk.org/dpdk/commit/?id=a0fce1193ce13a50c00624cb36605ebe
>> f7a3e60b.
>>>
>>>
>>
>> Aside from the Coverity complaint about rxq/txq NULL check after use, the
>> checks didn't seem to make sense anymore as rxq/txq are part of devargs_all
>> struct now, so they were removed.
>>
>> I added the NULL check on devargs_all to avoid a NULL deference while
>> getting them instead. The check isn't doing any harm, but looking at the
>> current paths to this fn. can see devargs_all would not be NULL, so I'm ok to
>> remove it too. Cian/Ferruh, wdyt?
> 
> I'm OK to remove this. Looks like it's no longer necessary. Good find David!
> 

Thanks Cian, I kept your Ack for v2.


  reply index

Thread overview: 45+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20191001125315.6191-1-ktraynor@redhat.com>
2019-10-01 12:53 ` [dpdk-stable] " Kevin Traynor
2019-10-04 10:57   ` Ferriter, Cian
2019-10-30  7:52   ` [dpdk-stable] [dpdk-dev] " David Marchand
2019-11-05 16:40     ` Kevin Traynor
2019-11-05 17:10       ` Ferriter, Cian
2019-11-06 19:03         ` Kevin Traynor [this message]
2019-10-01 13:03 ` [dpdk-stable] [PATCH 2/9] crypto/octeontx: fix possible NULL deference Kevin Traynor
2019-10-01 13:03   ` [dpdk-stable] [PATCH 3/9] net/bnxt: remove logically dead code Kevin Traynor
2019-10-02  1:28     ` [dpdk-stable] [dpdk-dev] " Ajit Khaparde
2019-10-30  7:43       ` David Marchand
2019-10-30 16:27         ` Ajit Khaparde
2019-11-05 15:39           ` Kevin Traynor
2019-10-01 13:04   ` [dpdk-stable] [PATCH 4/9] net/ipn3ke: fix incorrect commit check logic Kevin Traynor
2019-10-30  7:59     ` [dpdk-stable] [dpdk-dev] " David Marchand
2019-11-05 15:41       ` Kevin Traynor
2019-11-08 14:45         ` Xu, Rosen
2019-11-08 14:47           ` Kevin Traynor
2019-11-08 14:35       ` Xu, Rosen
2019-11-08 14:52     ` [dpdk-stable] " Xu, Rosen
2019-10-01 13:04   ` [dpdk-stable] [PATCH 5/9] net/ipn3ke: remove useless if statement Kevin Traynor
2019-10-30  8:01     ` David Marchand
2019-11-08 14:35       ` Xu, Rosen
2019-11-08 14:52     ` Xu, Rosen
2019-10-01 13:04   ` [dpdk-stable] [PATCH 6/9] net/ipn3ke: remove commented out code Kevin Traynor
2019-10-30  8:04     ` David Marchand
2019-11-08 14:40       ` Xu, Rosen
2019-11-08 14:51     ` Xu, Rosen
2019-10-01 13:04   ` [dpdk-stable] [PATCH 7/9] compress/octeontx: " Kevin Traynor
2019-10-30  8:06     ` [dpdk-stable] [dpdk-dev] " David Marchand
2019-10-01 13:04   ` [dpdk-stable] [PATCH 8/9] event/opdl: " Kevin Traynor
2019-10-03 10:50     ` Liang, Ma
2019-10-01 13:04   ` [dpdk-stable] [PATCH 9/9] net/bnxt: " Kevin Traynor
2019-10-01 15:42     ` Ajit Khaparde
2019-10-30  7:56   ` [dpdk-stable] [PATCH 2/9] crypto/octeontx: fix possible NULL deference David Marchand
     [not found] ` <20191106190203.10750-1-ktraynor@redhat.com>
2019-11-06 19:01   ` [dpdk-stable] [v2 PATCH 1/8] net/pcap: fix argument checks Kevin Traynor
2019-11-06 19:01   ` [dpdk-stable] [v2 PATCH 2/8] common/cpt: fix possible NULL deference Kevin Traynor
2019-11-06 19:01   ` [dpdk-stable] [v2 PATCH 3/8] net/ipn3ke: fix incorrect commit check logic Kevin Traynor
2019-11-08 14:50     ` Xu, Rosen
2019-11-06 19:01   ` [dpdk-stable] [v2 PATCH 4/8] net/ipn3ke: remove useless if statement Kevin Traynor
2019-11-08 14:49     ` Xu, Rosen
2019-11-06 19:02   ` [dpdk-stable] [v2 PATCH 5/8] net/ipn3ke: remove commented out code Kevin Traynor
2019-11-08 14:50     ` Xu, Rosen
2019-11-06 19:02   ` [dpdk-stable] [v2 PATCH 6/8] compress/octeontx: " Kevin Traynor
2019-11-06 19:02   ` [dpdk-stable] [v2 PATCH 7/8] event/opdl: " Kevin Traynor
2019-11-06 19:02   ` [dpdk-stable] [v2 PATCH 8/8] net/bnxt: " Kevin Traynor

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