netdev - Re: [PATCH] aquantia: Fix "ethtool -S" crash when adapter down.

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Date:   Thu, 4 May 2017 20:08:06 +0300
From:   Pavel Belous <pavel.belous@...antia.com>
To:     David Arcari <darcari@...hat.com>,
        "David S . Miller" <davem@...emloft.net>
Cc:     netdev@...r.kernel.org
Subject: Re: [PATCH] aquantia: Fix "ethtool -S" crash when adapter down.



On 04.05.2017 20:00, David Arcari wrote:
> Hi Pavel,
>
> On 05/04/2017 12:33 PM, Pavel Belous wrote:
>> From: Pavel Belous <pavel.belous@...antia.com>
>>
>> This patch fixes the crash that happens when driver tries to collect statistics
>> from already released "aq_vec" object.
>>
>> Fixes: 97bde5c4f909 ("net: ethernet: aquantia: Support for NIC-specific code")
>> Signed-off-by: Pavel Belous <pavel.belous@...antia.com>
>> ---
>>  drivers/net/ethernet/aquantia/atlantic/aq_nic.c | 3 ++-
>>  1 file changed, 2 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/net/ethernet/aquantia/atlantic/aq_nic.c b/drivers/net/ethernet/aquantia/atlantic/aq_nic.c
>> index cdb0299..3a32573 100644
>> --- a/drivers/net/ethernet/aquantia/atlantic/aq_nic.c
>> +++ b/drivers/net/ethernet/aquantia/atlantic/aq_nic.c
>> @@ -755,7 +755,7 @@ void aq_nic_get_stats(struct aq_nic_s *self, u64 *data)
>>  	count = 0U;
>>
>>  	for (i = 0U, aq_vec = self->aq_vec[0];
>> -		self->aq_vecs > i; ++i, aq_vec = self->aq_vec[i]) {
>> +		aq_vec && self->aq_vecs > i; ++i, aq_vec = self->aq_vec[i]) {
>>  		data += count;
>>  		aq_vec_get_sw_stats(aq_vec, data, &count);
>>  	}
>> @@ -961,6 +961,7 @@ void aq_nic_free_hot_resources(struct aq_nic_s *self)
>>  	for (i = AQ_DIMOF(self->aq_vec); i--;) {
>>  		if (self->aq_vec[i])
>>  			aq_vec_free(self->aq_vec[i]);
>> +			self->aq_vec[i] = NULL;
>
> I think you intended to to add { } to the if statement.  The code compiles as
> is, but the indentation is not correct.
>
> -DA

Oh. Sorry about that. I did not see the loss of braces during merge.
I will prepare another patch with Lino and David M. comments.

Regards,
Pavel.


>
>>  	}
>>
>>  err_exit:;
>>
>