net/af_xdp: fix integer overflow in umem size calculation

The multiplication of two u32 integers may cause an overflow with large
mempool sizes.

Fixes: 74b46340e2d4 ("net/af_xdp: support shared UMEM")

Signed-off-by: Martin Weiser <martin.weiser@allegro-packets.com>
Reviewed-by: Ferruh Yigit <ferruh.yigit@intel.com>

diff --git a/drivers/net/af_xdp/rte_eth_af_xdp.c b/drivers/net/af_xdp/rte_eth_af_xdp.c
index df2767b..4076ff7 100644 (file)
--- a/drivers/net/af_xdp/rte_eth_af_xdp.c
+++ b/drivers/net/af_xdp/rte_eth_af_xdp.c
@@ -968,7 +968,8 @@ xsk_umem_info *xdp_umem_configure(struct pmd_internals *internals,
 
                umem->mb_pool = mb_pool;
                base_addr = (void *)get_base_addr(mb_pool, &align);
-               umem_size = mb_pool->populated_size * usr_config.frame_size +
+               umem_size = (uint64_t)mb_pool->populated_size *
+                               (uint64_t)usr_config.frame_size +
                                align;
 
                ret = xsk_umem__create(&umem->umem, base_addr, umem_size,