linux-kernel - Re: [PATCH v2] thunderbolt: Fix to check the return value of kmemdup

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Date:   Mon, 25 Mar 2019 11:59:19 +0200
From:   Mika Westerberg <mika.westerberg@...ux.intel.com>
To:     Aditya Pakki <pakki001@....edu>
Cc:     kjlu@....edu, Andreas Noever <andreas.noever@...il.com>,
        Michael Jamet <michael.jamet@...el.com>,
        Yehezkel Bernat <YehezkelShB@...il.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] thunderbolt: Fix to check the return value of kmemdup

On Sat, Mar 23, 2019 at 03:20:33PM -0500, Aditya Pakki wrote:
> uuid in add_switch is allocted via kmemdup which can fail. The patch
> logs the error and cleans up the allocated memory for switch.
> 
> Signed-off-by: Aditya Pakki <pakki001@....edu>
> 
> ---
> v1: Change error handling from WARN_ONCE to return after clean up.
> ---
>  drivers/thunderbolt/icm.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/thunderbolt/icm.c b/drivers/thunderbolt/icm.c
> index e3fc920af682..be1174d86cef 100644
> --- a/drivers/thunderbolt/icm.c
> +++ b/drivers/thunderbolt/icm.c
> @@ -473,6 +473,11 @@ static void add_switch(struct tb_switch *parent_sw, u64 route,
>  		goto out;
>  
>  	sw->uuid = kmemdup(uuid, sizeof(*uuid), GFP_KERNEL);
> +	if (!sw->uuid) {
> +		WARN_ONCE(1, "cannot allocate memory for switch\n");

Please use tb_sw_WARN() or tb_sw_warn() here instead.

> +		tb_switch_put(sw);
> +		goto out;
> +	}
>  	sw->connection_id = connection_id;
>  	sw->connection_key = connection_key;
>  	sw->link = link;
> -- 
> 2.17.1