Re: [PATCH 4/4] misc: xilinx_sdfec: Prevent integer overflow in xsdfec_table_write()

[Michal Simek]

On 21. 08. 19 9:11, Dan Carpenter wrote:
> The checking here needs to handle integer overflows because "offset" and
> "len" come from the user.
> 
> Fixes: 20ec628e8007 ("misc: xilinx_sdfec: Add ability to configure LDPC")
> Signed-off-by: Dan Carpenter <dan.carpen...@oracle.com>
> ---
>  drivers/misc/xilinx_sdfec.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/misc/xilinx_sdfec.c b/drivers/misc/xilinx_sdfec.c
> index 3fc53d20abf3..0bf3bcc8e1ef 100644
> --- a/drivers/misc/xilinx_sdfec.c
> +++ b/drivers/misc/xilinx_sdfec.c
> @@ -611,7 +611,9 @@ static int xsdfec_table_write(struct xsdfec_dev *xsdfec, 
> u32 offset,
>        * Writes that go beyond the length of
>        * Shared Scale(SC) table should fail
>        */
> -     if ((XSDFEC_REG_WIDTH_JUMP * (offset + len)) > depth) {
> +     if (offset > depth / XSDFEC_REG_WIDTH_JUMP ||
> +         len > depth / XSDFEC_REG_WIDTH_JUMP ||
> +         offset + len > depth / XSDFEC_REG_WIDTH_JUMP) {
>               dev_dbg(xsdfec->dev, "Write exceeds SC table length");
>               return -EINVAL;
>       }
> 

Reviewed-by: Michal Simek <michal.si...@xilinx.com>

Thanks,
Michal