hw/misc/xlnx-versal-trng: Call register_finalize_block

The TYPE_XLNX_VERSAL_TRNG device creates a register block with
register_init_block32() in its instance_init method; we must
therefore destroy it in our instance_finalize method to avoid a leak
in the QOM introspection "init-inspect-finalize" lifecycle:

Direct leak of 304 byte(s) in 1 object(s) allocated from:
    #0 0x55842ec799d8 in __interceptor_calloc (/mnt/nvmedisk/linaro/qemu-from-laptop/qemu/build/asan/qemu-system-aarch64+0x294e9d8) (BuildId: 47496e53f3e779f1c7e9b82cbea07407152b498b)
    #1 0x7fe793c75c50 in g_malloc0 debian/build/deb/../../../glib/gmem.c:161:13
    #2 0x55842f0aec5d in register_init_block hw/core/register.c:248:34
    #3 0x55842f0af6be in register_init_block32 hw/core/register.c:299:12
    #4 0x55842f801588 in trng_init hw/misc/xlnx-versal-trng.c:614:9
    #5 0x558431c411a1 in object_init_with_type qom/object.c:420:9
    #6 0x558431c2847b in object_initialize_with_type qom/object.c:562:5
    #7 0x558431c29d1d in object_new_with_type qom/object.c:782:5
    #8 0x558431c29df1 in object_new qom/object.c:797:12
    #9 0x558432427c1d in qmp_device_list_properties qom/qom-qmp-cmds.c:144:11

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Edgar E. Iglesias <edgar.iglesias@amd.com>
Reviewed-by: Francisco Iglesias <francisco.iglesias@amd.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-id: 20240822162127.705879-6-peter.maydell@linaro.org

hw/misc/xlnx-versal-trng.c

@@ -608,9 +608,8 @@ static void trng_init(Object *obj)
 {
     XlnxVersalTRng *s = XLNX_VERSAL_TRNG(obj);
     SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
-    RegisterInfoArray *reg_array;
 
-    reg_array =
+    s->reg_array =
         register_init_block32(DEVICE(obj), trng_regs_info,
                               ARRAY_SIZE(trng_regs_info),
                               s->regs_info, s->regs,
@@ -618,7 +617,7 @@ static void trng_init(Object *obj)
                               XLNX_VERSAL_TRNG_ERR_DEBUG,
                               R_MAX * 4);
 
-    sysbus_init_mmio(sbd, &reg_array->mem);
+    sysbus_init_mmio(sbd, &s->reg_array->mem);
     sysbus_init_irq(sbd, &s->irq);
 
     s->prng = g_rand_new();
@@ -628,6 +627,7 @@ static void trng_finalize(Object *obj)
 {
     XlnxVersalTRng *s = XLNX_VERSAL_TRNG(obj);
 
+    register_finalize_block(s->reg_array);
     g_rand_free(s->prng);
     s->prng = NULL;
 }

include/hw/misc/xlnx-versal-trng.h

@@ -50,6 +50,7 @@ typedef struct XlnxVersalTRng {
     uint64_t forced_prng_count;
     uint64_t tst_seed[2];
 
+    RegisterInfoArray *reg_array;
     uint32_t regs[RMAX_XLNX_VERSAL_TRNG];
     RegisterInfo regs_info[RMAX_XLNX_VERSAL_TRNG];
 } XlnxVersalTRng;