linux-kernel - Re: [PATCH 2/2] RDMA/srp: Fix error return code in srp_parse

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Message-ID: <Y4DTMQVenpsEiKHz@smile.fi.intel.com>
Date:   Fri, 25 Nov 2022 16:37:37 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Wang Yufen <wangyufen@...wei.com>
Cc:     bvanassche@....org, jgg@...pe.ca, leon@...nel.org,
        dennis.dalessandro@...nelisnetworks.com,
        linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
        bart.vanassche@....com, easwar.hariharan@...el.com
Subject: Re: [PATCH 2/2] RDMA/srp: Fix error return code in
 srp_parse_options()

On Fri, Nov 25, 2022 at 08:03:51PM +0800, Wang Yufen wrote:
> In the previous while loop, "ret" may be assigned zero. Therefore,
> "ret" needs to be assigned -EINVAL at the beginning of each loop.

...

>  	while ((p = strsep(&sep_opt, ",\n")) != NULL) {
> +		ret = -EINVAL;
>  		if (!*p)
>  			continue;

Better option is to investigate each case separately and gather all of them
into a single fix.

For example, this

	case SRP_OPT_MAX_IT_IU_SIZE:
		if (match_int(args, &token) || token < 0) {
			pr_warn("bad maximum initiator to target IU size '%s'\n", p);
			goto out;
		}
		target->max_it_iu_size = token;
		break;

can be rewritten as

	case SRP_OPT_MAX_IT_IU_SIZE:
		ret = match_int(args, &token);
		if (ret)
			goto out;
		if (token < 0) {
			pr_warn("bad maximum initiator to target IU size '%s'\n", p);
			ret = -EINVAL;
			goto out;
		}
		target->max_it_iu_size = token;
		break;

and so on...

-- 
With Best Regards,
Andy Shevchenko