Re: [PATCH] ntb_tool: check null return of devm_kcalloc in tool_init_mws

[Dave Jiang]

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@xxxxxxxxx>

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

> ---
>   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;