linux-kernel - Re: [PATCH] target: add error handling for match

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Message-ID: <1528838485.24454.2.camel@HansenPartnership.com>
Date:   Tue, 12 Jun 2018 14:21:25 -0700
From:   James Bottomley <James.Bottomley@...senPartnership.com>
To:     Zhouyang Jia <jiazhouyang09@...il.com>
Cc:     "Nicholas A. Bellinger" <nab@...ux-iscsi.org>,
        linux-scsi@...r.kernel.org, target-devel@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] target: add error handling for match_int

On Tue, 2018-06-12 at 12:52 +0800, Zhouyang Jia wrote:
> When match_int fails, the lack of error-handling code may
> cause unexpected results.
> 
> This patch adds error-handling code after calling match_int.
> 
> Signed-off-by: Zhouyang Jia <jiazhouyang09@...il.com>
> ---
>  drivers/target/target_core_rd.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/target/target_core_rd.c
> b/drivers/target/target_core_rd.c
> index a6e8106..7bc89ff 100644
> --- a/drivers/target/target_core_rd.c
> +++ b/drivers/target/target_core_rd.c
> @@ -573,14 +573,16 @@ static ssize_t
> rd_set_configfs_dev_params(struct se_device *dev,
>  		token = match_token(ptr, tokens, args);
>  		switch (token) {
>  		case Opt_rd_pages:
> -			match_int(args, &arg);
> +			if (match_int(args, &arg))
> +				return -EINVAL;

The first observation is that this would leak the kmalloc'd orig
variable, but the second is that I don't think terminating parsing is
the right thing to do even if match_int() returns an error: just
ignoring this option and proceed to the next seems to be the best
course because that's what we do with unrecognised options (the
default: case).

James