linux-kernel - Re: [PATCH] ntb_tool: check null return of devm_kcalloc in tool_init

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Message-ID: <caa8671d-ab6c-dcec-c363-e12e1515f65e@intel.com>
Date:   Mon, 27 Feb 2023 08:58:29 -0700
From:   Dave Jiang <dave.jiang@...el.com>
To:     Kang Chen <void0red@...il.com>, jdmason@...zu.us
Cc:     allenbh@...il.com, ntb@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ntb_tool: check null return of devm_kcalloc in
 tool_init_mws



On 2/25/23 10:57 PM, Kang Chen wrote:
> devm_kcalloc may fails, tc->peers[pidx].outmws might be null
> and will cause null pointer dereference later.
> 
> Signed-off-by: Kang Chen <void0red@...il.com>

Reviewed-by: Dave Jiang <dave.jiang@...el.com>

> ---
>   drivers/ntb/test/ntb_tool.c | 2 ++
>   1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/ntb/test/ntb_tool.c b/drivers/ntb/test/ntb_tool.c
> index 5ee0afa62..eeeb4b1c9 100644
> --- a/drivers/ntb/test/ntb_tool.c
> +++ b/drivers/ntb/test/ntb_tool.c
> @@ -998,6 +998,8 @@ static int tool_init_mws(struct tool_ctx *tc)
>   		tc->peers[pidx].outmws =
>   			devm_kcalloc(&tc->ntb->dev, tc->peers[pidx].outmw_cnt,
>   				   sizeof(*tc->peers[pidx].outmws), GFP_KERNEL);
> +		if (tc->peers[pidx].outmws == NULL)
> +			return -ENOMEM;
>   
>   		for (widx = 0; widx < tc->peers[pidx].outmw_cnt; widx++) {
>   			tc->peers[pidx].outmws[widx].pidx = pidx;