> -----Original Message-----
> From: Pei, Andy
> Sent: Thursday, May 23, 2019 12:31
> To: dev@dpdk.org
> Cc: Pei, Andy <andy....@intel.com>; Xu, Rosen <rosen...@intel.com>;
> sta...@dpdk.org
> Subject: [PATCH] net/ipn3ke: fix null pointer dereference
>
> In current code, scenario may happens that when function
> ipn3ke_hw_tm_node_wr is called, struct ipn3ke_tm_node n has a NULL
> element parent_node, however, the element parent_node of struct
> ipn3ke_tm_node n is used in an invalid way.
> After applying this patch,
> this null pointer dereference is avoided.
>
> Coverity issue: 337921
> Fixes: c820468ac99c ("net/ipn3ke: support TM")
> Cc: rosen...@intel.com
> Cc: sta...@dpdk.org
>
> Signed-off-by: Andy Pei <andy....@intel.com>
> ---
> drivers/net/ipn3ke/ipn3ke_tm.c | 43 +++++++++++++++++++++++---------------
> ----
> 1 file changed, 24 insertions(+), 19 deletions(-)
>
> diff --git a/drivers/net/ipn3ke/ipn3ke_tm.c
> b/drivers/net/ipn3ke/ipn3ke_tm.c index 4bcf3aa..30a3dfd 100644
> --- a/drivers/net/ipn3ke/ipn3ke_tm.c
> +++ b/drivers/net/ipn3ke/ipn3ke_tm.c
> @@ -1579,7 +1579,8 @@ struct ipn3ke_tm_shaper_params_range_type
> ipn3ke_tm_shaper_params_rang[] = {
>
> static int
> ipn3ke_hw_tm_node_wr(struct ipn3ke_hw *hw,
> - struct ipn3ke_tm_node *n)
> + struct ipn3ke_tm_node *n,
> + struct ipn3ke_tm_node *parent_node)
> {
> uint32_t level;
>
> @@ -1650,11 +1651,12 @@ struct ipn3ke_tm_shaper_params_range_type
> ipn3ke_tm_shaper_params_rang[] = {
> /**
> * Configure Map
> */
> - IPN3KE_MASK_WRITE_REG(hw,
> - IPN3KE_QOS_MAP_L2_X,
> - n->node_index,
> - n->parent_node->node_index,
> - IPN3KE_QOS_MAP_L2_MASK);
> + if (parent_node)
> + IPN3KE_MASK_WRITE_REG(hw,
> + IPN3KE_QOS_MAP_L2_X,
> + n->node_index,
> + parent_node->node_index,
> + IPN3KE_QOS_MAP_L2_MASK);
>
> break;
> case IPN3KE_TM_NODE_LEVEL_COS:
> @@ -1707,11 +1709,12 @@ struct ipn3ke_tm_shaper_params_range_type
> ipn3ke_tm_shaper_params_rang[] = {
> 0x80000000))
> ;
>
> - IPN3KE_MASK_WRITE_REG(hw,
> - IPN3KE_QM_UID_CONFIG_DATA,
> - 0,
> - (1 << 8 | n->parent_node->parent_node-
> >node_index),
> - 0x1FF);
> + if (parent_node && parent_node->parent_node)
> + IPN3KE_MASK_WRITE_REG(hw,
> + IPN3KE_QM_UID_CONFIG_DATA,
> + 0,
> + (1 << 8 | parent_node->parent_node-
> >node_index),
> + 0x1FF);
>
> IPN3KE_MASK_WRITE_REG(hw,
> IPN3KE_QM_UID_CONFIG_CTRL,
> @@ -1728,11 +1731,12 @@ struct ipn3ke_tm_shaper_params_range_type
> ipn3ke_tm_shaper_params_rang[] = {
> /**
> * Configure Map
> */
> - IPN3KE_MASK_WRITE_REG(hw,
> - IPN3KE_QOS_MAP_L1_X,
> - n->node_index,
> - n->parent_node->node_index,
> - IPN3KE_QOS_MAP_L1_MASK);
> + if (parent_node)
> + IPN3KE_MASK_WRITE_REG(hw,
> + IPN3KE_QOS_MAP_L1_X,
> + n->node_index,
> + parent_node->node_index,
> + IPN3KE_QOS_MAP_L1_MASK);
>
> break;
> default:
> @@ -1772,7 +1776,8 @@ struct ipn3ke_tm_shaper_params_range_type
> ipn3ke_tm_shaper_params_rang[] = {
> NULL,
> rte_strerror(EINVAL));
> }
> - ipn3ke_hw_tm_node_wr(hw, n);
> + parent_node = n->parent_node;
> + ipn3ke_hw_tm_node_wr(hw, n, parent_node);
> }
>
> nl = &tm->h.vt_commit_node_list;
> @@ -1802,7 +1807,7 @@ struct ipn3ke_tm_shaper_params_range_type
> ipn3ke_tm_shaper_params_rang[] = {
> NULL,
> rte_strerror(EINVAL));
> }
> - ipn3ke_hw_tm_node_wr(hw, n);
> + ipn3ke_hw_tm_node_wr(hw, n, parent_node);
> }
>
> nl = &tm->h.cos_commit_node_list;
> @@ -1836,7 +1841,7 @@ struct ipn3ke_tm_shaper_params_range_type
> ipn3ke_tm_shaper_params_rang[] = {
> NULL,
> rte_strerror(EINVAL));
> }
> - ipn3ke_hw_tm_node_wr(hw, n);
> + ipn3ke_hw_tm_node_wr(hw, n, parent_node);
> }
>
> return 0;
> --
> 1.8.3.1
Acked-by: Rosen Xu <rosen...@intel.com>
