Re: [PATCH] Check whether divisor is non-zero before division

[Greg KH <gregkh@linuxfoundation.org>]

On Thu, May 23, 2024 at 03:22:42PM +0800, Shichao Lai wrote:
> Since uzonesize may be zero, so a judgement for non-zero is nessesary.
> 
> Reported-by: xingwei lee <xrivendell7@gmail.com>
> Reported-by: yue sun <samsun1006219@gmail.com>
> Signed-off-by: Shichao Lai <shichaorai@gmail.com>
> ---
>  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 115f05a6201a..db075a8c03cb 100644
> --- a/drivers/usb/storage/alauda.c
> +++ b/drivers/usb/storage/alauda.c
> @@ -947,6 +947,8 @@ static int alauda_read_data(struct us_data *us, unsigned long address,
>  	sg = NULL;
>  
>  	while (sectors > 0) {
> +		if (!uzonesize)
> +			return USB_STOR_TRANSPORT_ERROR;
>  		unsigned int zone = lba / uzonesize; /* integer division */
>  		unsigned int lba_offset = lba - (zone * uzonesize);
>  		unsigned int pages;
> -- 
> 2.34.1
> 
> 

Looks good, thanks!  I'll queue this up after 6.10-rc1 is out.

greg k-h