[Intel-wired-lan] [PATCH net] ice: Fix use-after-scope in ice_sched_add_nodes_to_layer()

[NeKon69]

Commit 7fb09a737536 ("ice: Modify recursive way of adding nodes")
changed ice_sched_add_nodes_to_layer() from recursive control flow to an
iterative loop.

Inside the loop, first_teid_ptr may be set to the address of a
block-local variable:

        u32 temp;
        ...
        if (num_added)
                first_teid_ptr = &temp;

On the next loop iteration, first_teid_ptr may be passed to
ice_sched_add_nodes_to_hw_layer(), after temp from the previous
iteration has gone out of scope.

Move temp outside the loop so the pointer remains valid for the lifetime
of ice_sched_add_nodes_to_layer().

This was found by Clang with LifetimeSafety enabled while testing C
language support on a Linux allmodconfig build.

Fixes: 7fb09a737536 ("ice: Modify recursive way of adding nodes")
Link: https://github.com/llvm/llvm-project/pull/203270
Signed-off-by: NeKon69 <nobod...@gmail.com>
---
 drivers/net/ethernet/intel/ice/ice_sched.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/intel/ice/ice_sched.c 
b/drivers/net/ethernet/intel/ice/ice_sched.c
index fff0c1afdb41..089ad3967be5 100644
--- a/drivers/net/ethernet/intel/ice/ice_sched.c
+++ b/drivers/net/ethernet/intel/ice/ice_sched.c
@@ -1074,11 +1074,11 @@ ice_sched_add_nodes_to_layer(struct ice_port_info *pi,
        u32 *first_teid_ptr = first_node_teid;
        u16 new_num_nodes = num_nodes;
        int status = 0;
+       u32 temp;
 
        *num_nodes_added = 0;
        while (*num_nodes_added < num_nodes) {
                u16 max_child_nodes, num_added = 0;
-               u32 temp;
 
                status = ice_sched_add_nodes_to_hw_layer(pi, tc_node, parent,
                                                         layer, new_num_nodes,
-- 
2.54.0