linux-kernel - Re: [PATCH 2/5] drivers/scsi/bnx2fc/bnx2fc_io.c: Remove potential NULL dereference

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Date:	Mon, 24 Sep 2012 12:37:25 -0700
From:	"Bhanu Prakash Gollapudi" <bprakash@...adcom.com>
To:	"Julia Lawall" <Julia.Lawall@...6.fr>
cc:	"James E.J. Bottomley" <JBottomley@...allels.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/5] drivers/scsi/bnx2fc/bnx2fc_io.c: Remove
 potential NULL dereference

On 09/07/2012 11:23 AM, Bhanu Prakash Gollapudi wrote:
> On 8/14/2012 8:49 AM, Julia Lawall wrote:
>> From: Julia Lawall <Julia.Lawall@...6.fr>
>>
>> If the NULL test is necessary, the initialization involving a 
>> dereference of
>> the tested value should be moved after the NULL test.
>>
>> The sematic patch that fixes this problem is as follows:
>> (http://coccinelle.lip6.fr/)
>>
>> // <smpl>
>> @@
>> type T;
>> expression E;
>> identifier i,fld;
>> statement S;
>> @@
>>
>> - T i = E->fld;
>> + T i;
>>    ... when != E
>>        when != i
>>    if (E == NULL) S
>> + i = E->fld;
>> // </smpl>
>>
>> Signed-off-by: Julia Lawall <Julia.Lawall@...6.fr>
>>
>> ---
>>   drivers/scsi/bnx2fc/bnx2fc_io.c |    3 ++-
>>   1 file changed, 2 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/scsi/bnx2fc/bnx2fc_io.c 
>> b/drivers/scsi/bnx2fc/bnx2fc_io.c
>> index 73f231c..1dd82db 100644
>> --- a/drivers/scsi/bnx2fc/bnx2fc_io.c
>> +++ b/drivers/scsi/bnx2fc/bnx2fc_io.c
>> @@ -686,7 +686,7 @@ static int bnx2fc_initiate_tmf(struct scsi_cmnd 
>> *sc_cmd, u8 tm_flags)
>>   {
>>       struct fc_lport *lport;
>>       struct fc_rport *rport = 
>> starget_to_rport(scsi_target(sc_cmd->device));
>> -    struct fc_rport_libfc_priv *rp = rport->dd_data;
>> +    struct fc_rport_libfc_priv *rp;
>>       struct fcoe_port *port;
>>       struct bnx2fc_interface *interface;
>>       struct bnx2fc_rport *tgt;
>> @@ -712,6 +712,7 @@ static int bnx2fc_initiate_tmf(struct scsi_cmnd 
>> *sc_cmd, u8 tm_flags)
>>           rc = FAILED;
>>           goto tmf_err;
>>       }
>> +    rp = rport->dd_data;
>>
>>       rc = fc_block_scsi_eh(sc_cmd);
>>       if (rc)
>>
>>
> Thanks Julia.
>
> Acked-by: Bhanu Prakash Gollapudi <bprakash@...adcom.com>

James, can you please pick up this patch also for 'misc'?

Thanks,
Bhanu
>
>
> -- 
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