Re: [PATCH v2 1/6] baseband/fpga_5gnr_fec: fix possible div by zero

[Maxime Coquelin <maxime.coquelin@redhat.com>]

On 5/25/23 20:28, Hernan Vargas wrote:
> Add fix to have an early exit when z_c is zero to prevent a possible
> division by zero.
> 
> Fixes: 44dc6faa796f ("baseband/fpga_5gnr_fec: add LDPC processing functions")
> Cc: stable@dpdk.org
> 
> Signed-off-by: Hernan Vargas <hernan.vargas@intel.com>
> Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>
> ---
>   drivers/baseband/fpga_5gnr_fec/rte_fpga_5gnr_fec.c | 4 +++-
>   1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/baseband/fpga_5gnr_fec/rte_fpga_5gnr_fec.c b/drivers/baseband/fpga_5gnr_fec/rte_fpga_5gnr_fec.c
> index f29565af8cca..99390c48160c 100644
> --- a/drivers/baseband/fpga_5gnr_fec/rte_fpga_5gnr_fec.c
> +++ b/drivers/baseband/fpga_5gnr_fec/rte_fpga_5gnr_fec.c
> @@ -877,9 +877,11 @@ check_desc_error(uint32_t error_code) {
>   static inline uint16_t
>   get_k0(uint16_t n_cb, uint16_t z_c, uint8_t bg, uint8_t rv_index)
>   {
> +	uint16_t n = (bg == 1 ? N_ZC_1 : N_ZC_2) * z_c;
>   	if (rv_index == 0)
>   		return 0;
> -	uint16_t n = (bg == 1 ? N_ZC_1 : N_ZC_2) * z_c;
> +	if (z_c == 0)
> +		return 0;
>   	if (n_cb == n) {
>   		if (rv_index == 1)
>   			return (bg == 1 ? K0_1_1 : K0_1_2) * z_c;


Applied to dpdk-next-baseband/for-main.

Thanks,
Maxime