[Stable-8.2.3 24/87] hmat acpi: Fix out of bounds access due to missing use of indirection

[Michael Tokarev]

From: Jonathan Cameron <Jonathan.Cameron@huawei.com>

With a numa set up such as

-numa nodeid=0,cpus=0 \
-numa nodeid=1,memdev=mem \
-numa nodeid=2,cpus=1

and appropriate hmat_lb entries the initiator list is correctly
computed and writen to HMAT as 0,2 but then the LB data is accessed
using the node id (here 2), landing outside the entry_list array.

Stash the reverse lookup when writing the initiator list and use
it to get the correct array index index.

Fixes: 4586a2cb83 ("hmat acpi: Build System Locality Latency and Bandwidth 
Information Structure(s)")
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Message-Id: <20240307160326.31570-3-Jonathan.Cameron@huawei.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
(cherry picked from commit 74e2845c5f95b0c139c79233ddb65bb17f2dd679)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

diff --git a/hw/acpi/hmat.c b/hw/acpi/hmat.c
index 3042d223c8..2f3a2362bd 100644
--- a/hw/acpi/hmat.c
+++ b/hw/acpi/hmat.c
@@ -78,6 +78,7 @@ static void build_hmat_lb(GArray *table_data, HMAT_LB_Info 
*hmat_lb,
                           uint32_t *initiator_list)
 {
     int i, index;
+    uint32_t initiator_to_index[MAX_NODES] = {};
     HMAT_LB_Data *lb_data;
     uint16_t *entry_list;
     uint32_t base;
@@ -121,6 +122,8 @@ static void build_hmat_lb(GArray *table_data, HMAT_LB_Info 
*hmat_lb,
     /* Initiator Proximity Domain List */
     for (i = 0; i < num_initiator; i++) {
         build_append_int_noprefix(table_data, initiator_list[i], 4);
+        /* Reverse mapping for array possitions */
+        initiator_to_index[initiator_list[i]] = i;
     }
 
     /* Target Proximity Domain List */
@@ -132,7 +135,8 @@ static void build_hmat_lb(GArray *table_data, HMAT_LB_Info 
*hmat_lb,
     entry_list = g_new0(uint16_t, num_initiator * num_target);
     for (i = 0; i < hmat_lb->list->len; i++) {
         lb_data = &g_array_index(hmat_lb->list, HMAT_LB_Data, i);
-        index = lb_data->initiator * num_target + lb_data->target;
+        index = initiator_to_index[lb_data->initiator] * num_target +
+            lb_data->target;
 
         entry_list[index] = (uint16_t)(lb_data->data / hmat_lb->base);
     }
-- 
2.39.2