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From: "zhengbin (A)" <zhengbin13@huawei.com>
To: Bart Van Assche <bvanassche@acm.org>, <jejb@linux.ibm.com>,
	<martin.petersen@oracle.com>, <linux-scsi@vger.kernel.org>
Cc: <yi.zhang@huawei.com>
Subject: Re: [PATCH v3] scsi: core: fix uninit-value access of variable sshdr
Date: Thu, 17 Oct 2019 11:26:00 +0800
Message-ID: <eb7310f0-ec09-0ed9-c19d-c52cf0d62f0c@huawei.com> (raw)
In-Reply-To: <3e3f05fb-387a-d55f-fc90-72d01c6d026a@acm.org>


On 2019/10/17 10:45, Bart Van Assche wrote:
> On 2019-10-11 20:25, zhengbin wrote:
>> diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
>> index 5447738..d5e29c5 100644
>> --- a/drivers/scsi/scsi_lib.c
>> +++ b/drivers/scsi/scsi_lib.c
>> @@ -255,6 +255,13 @@ int __scsi_execute(struct scsi_device *sdev, const unsigned char *cmd,
>>  	struct scsi_request *rq;
>>  	int ret = DRIVER_ERROR << 24;
>>
>> +	/*
>> +	 * Zero-initialize sshdr for those callers that check the *sshdr
>> +	 * contents even if no sense data is available.
>> +	 */
>> +	if (sshdr)
>> +		memset(sshdr, 0, sizeof(struct scsi_sense_hdr));
>> +
>>  	req = blk_get_request(sdev->request_queue,
>>  			data_direction == DMA_TO_DEVICE ?
>>  			REQ_OP_SCSI_OUT : REQ_OP_SCSI_IN, BLK_MQ_REQ_PREEMPT);
> Although I don't have a strong opinion about this, I'm still wondering
> whether 'sshdr' should be initialized in __scsi_execute() or by its caller.
@jejb, @martin, any suggestion?
>
>> diff --git a/drivers/scsi/sr_ioctl.c b/drivers/scsi/sr_ioctl.c
>> index ffcf902..335cfdd 100644
>> --- a/drivers/scsi/sr_ioctl.c
>> +++ b/drivers/scsi/sr_ioctl.c
>> @@ -206,6 +206,11 @@ int sr_do_ioctl(Scsi_CD *cd, struct packet_command *cgc)
>>
>>  	/* Minimal error checking.  Ignore cases we know about, and report the rest. */
>>  	if (driver_byte(result) != 0) {
>> +		if (!scsi_sense_valid(sshdr)) {
>> +			err = -EIO;
>> +			goto out;
>> +		}
>> +
>>  		switch (sshdr->sense_key) {
>>  		case UNIT_ATTENTION:
>>  			SDev->changed = 1;
> Shouldn't this be a separate patch?
OK, will send a separate patch
>
> Thanks,
>
> Bart.
>
> .
>


      reply index

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-12  3:25 zhengbin
2019-10-17  0:05 ` Finn Thain
2019-10-17  1:16   ` zhengbin (A)
2019-10-17  2:45 ` Bart Van Assche
2019-10-17  3:26   ` zhengbin (A) [this message]

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