[PATCH] rib: fix traversal with /32 route

[Medvedkin, Vladimir]

+Cc:stable at dpdk.org

On 14/04/2022 21:01, Stephen Hemminger wrote:
> If a /32 route is entered in the RIB the code to traverse
> will not see that a a end of the tree. This is due to trying
> to do a negative shift which is an undefined in C.
> 
> Fix by checking for max depth as is already done in rib6.
> 
> Signed-off-by: Stephen Hemminger <stephen at networkplumber.org>
> ---
>   lib/rib/rte_rib.c | 2 ++
>   1 file changed, 2 insertions(+)
> 
> diff --git a/lib/rib/rte_rib.c b/lib/rib/rte_rib.c
> index cd9e823068d2..0603980cabd2 100644
> --- a/lib/rib/rte_rib.c
> +++ b/lib/rib/rte_rib.c
> @@ -71,6 +71,8 @@ is_covered(uint32_t ip1, uint32_t ip2, uint8_t depth)
>   static inline struct rte_rib_node *
>   get_nxt_node(struct rte_rib_node *node, uint32_t ip)
>   {
> +	if (node->depth == RIB_MAXDEPTH)
> +		return NULL;
>   	return (ip & (1 << (31 - node->depth))) ? node->right : node->left;
>   }
>   

Acked-by: Vladimir Medvedkin <vladimir.medvedkin at intel.com>

-- 
Regards,
Vladimir