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From: "Kumar, Ravi1" <Ravi1.Kumar@amd.com>
To: Ferruh Yigit <ferruh.yigit@intel.com>,
	Pallantla Poornima <pallantlax.poornima@intel.com>,
	"dev@dpdk.org" <dev@dpdk.org>
Cc: "reshma.pattan@intel.com" <reshma.pattan@intel.com>,
	"jananeex.m.parthasarathy@intel.com"
	<jananeex.m.parthasarathy@intel.com>,
	"stable@dpdk.org" <stable@dpdk.org>
Subject: Re: [dpdk-dev] [dpdk-stable] [PATCH] net/axgbe: fix double unlock coverity issue
Date: Mon, 21 Oct 2019 08:20:18 +0000	[thread overview]
Message-ID: <MW2PR12MB25706CDAD4A0EF69AA031EF8AE690@MW2PR12MB2570.namprd12.prod.outlook.com> (raw)
In-Reply-To: <df4bc1b1-2232-01aa-9fb5-608968553aa6@intel.com>

>On 10/9/2019 9:41 AM, Ferruh Yigit wrote:
>> On 9/19/2019 12:01 PM, Pallantla Poornima wrote:
>>> One issue caught by Coverity 340835
>>> *unlock: axgbe_phy_set_mode unlocks pdata->phy_mutex
>>> *double_unlock: axgbe_phy_sfp_detect unlocks pdata->phy_mutex while 
>>> it is unlocked.
>>>
>>> In axgbe_phy_sfp_detect()/axgbe_phy_set_redrv_mode(),
>>> axgbe_phy_get_comm_ownership() and axgbe_phy_put_comm_ownership() are 
>>> invoked subsequently.
>>>
>>> Currently in axgbe_phy_get_comm_ownership(), during one of the case 
>>> 'phy_data->comm_owned' is not protected and before returning 0, lock 
>>> is not called and unlock is called in axgbe_phy_put_comm_ownership() 
>>> directly which is incorrect.
>>>
>>> Ideally, the variable 'phy_data->comm_owned' needs to be protected.
>>> During success scenario, lock is called in 
>>> axgbe_phy_get_comm_ownership() followed by unlock in axgbe_phy_put_comm_ownership().
>>> In failure case, unlock is invoked in axgbe_phy_get_comm_ownership() 
>>> itself appropriately.
>>>
>>> The fix is to protect 'phy_data->comm_owned' in the identified case 
>>> ensuring locks/unlocks properly exist.
>>>
>>> Coverity issue: 340835
>>> Fixes: a5c7273771 ("net/axgbe: add phy programming APIs")
>>> Cc: stable@dpdk.org
>>>
>>> Signed-off-by: Pallantla Poornima <pallantlax.poornima@intel.com>
>>
>> lgtm, 'axgbe_phy_put_comm_ownership()' expects 'axgbe_phy_get_comm_ownership()'
>> gets the lock. Thanks for fixing the coverity issue.
>>
>> But still, Ravi can you please review/test the patch?
>>
>
>If there is no objection the patch will be merged soon.
>
Looks good to me. Ok to merge.

Regards,
Ravi

  reply	other threads:[~2019-10-21  8:20 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-19 11:01 [dpdk-dev] " Pallantla Poornima
2019-09-25  6:03 ` Poornima, PallantlaX
2019-10-09  8:41 ` [dpdk-dev] [dpdk-stable] " Ferruh Yigit
2019-10-18 16:53   ` Ferruh Yigit
2019-10-21  8:20     ` Kumar, Ravi1 [this message]
2019-10-21  9:09       ` Ferruh Yigit

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