Re: [PATCH RESEND] scsi: megaraid: check kzalloc

[Libo Chen <clbchenlibo.chen@huawei.com>]

On 2013/5/29 23:03, Tomas Henzl wrote:
> On 05/24/2013 11:40 AM, Libo Chen wrote:
>> we should check kzalloc, avoid to hit oops
>>
>> Signed-off-by: Libo Chen <libo.chen@huawei.com>
>> ---
>>  drivers/scsi/megaraid.c |    4 ++++
>>  1 files changed, 4 insertions(+), 0 deletions(-)
>>
>> instead of checking scmd->device, sdev is more appropriate.
>>
>> diff --git a/drivers/scsi/megaraid.c b/drivers/scsi/megaraid.c
>> index 846f475..6b623cb 100644
>> --- a/drivers/scsi/megaraid.c
>> +++ b/drivers/scsi/megaraid.c
>> @@ -4161,6 +4161,10 @@ mega_internal_command(adapter_t *adapter, megacmd_t *mc, mega_passthru *pthru)
>>  	memset(scb, 0, sizeof(scb_t));
>>
>>  	sdev = kzalloc(sizeof(struct scsi_device), GFP_KERNEL);
>> +	if (sdev) {
>> +		scsi_free_command(GFP_KERNEL, scmd);
> 
> I think, that a mutex_unlock(&adapter->int_mtx); is also needed
> Maybe just setting a rval = -ENOMEM and a jump to to some point below?
> 
> tomash

thanks for catching this.

when kzalloc broken, fist unlock and then return.  I will update later.


Libo

> 
>> +		return -ENOMEM;
>> +	}
>>  	scmd->device = sdev;
>>
>>  	memset(adapter->int_cdb, 0, sizeof(adapter->int_cdb));
> 
> 
> .
>