linux-kernel - Re: [PATCH] usb: storage: Add check for kcalloc

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Date:   Thu, 8 Dec 2022 10:26:24 -0500
From:   Alan Stern <stern@...land.harvard.edu>
To:     Jiasheng Jiang <jiasheng@...as.ac.cn>
Cc:     gregkh@...uxfoundation.org, linux-usb@...r.kernel.org,
        usb-storage@...ts.one-eyed-alien.net, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] usb: storage: Add check for kcalloc

On Thu, Dec 08, 2022 at 07:00:58PM +0800, Jiasheng Jiang wrote:
> As kcalloc may return NULL pointer, the return value should
> be checked and return error if fails as same as the ones in
> alauda_read_map.
> 
> Fixes: e80b0fade09e ("[PATCH] USB Storage: add alauda support")
> Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>
> ---

Acked-by: Alan Stern <stern@...land.harvard.edu>

>  drivers/usb/storage/alauda.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/usb/storage/alauda.c b/drivers/usb/storage/alauda.c
> index 747be69e5e69..5e912dd29b4c 100644
> --- a/drivers/usb/storage/alauda.c
> +++ b/drivers/usb/storage/alauda.c
> @@ -438,6 +438,8 @@ static int alauda_init_media(struct us_data *us)
>  		+ MEDIA_INFO(us).blockshift + MEDIA_INFO(us).pageshift);
>  	MEDIA_INFO(us).pba_to_lba = kcalloc(num_zones, sizeof(u16*), GFP_NOIO);
>  	MEDIA_INFO(us).lba_to_pba = kcalloc(num_zones, sizeof(u16*), GFP_NOIO);
> +	if (MEDIA_INFO(us).pba_to_lba == NULL || MEDIA_INFO(us).lba_to_pba == NULL)
> +		return USB_STOR_TRANSPORT_ERROR;
>  
>  	if (alauda_reset_media(us) != USB_STOR_XFER_GOOD)
>  		return USB_STOR_TRANSPORT_ERROR;
> -- 
> 2.25.1
>