net/dp8393x: do not use memory_region_init_rom_device with NULL

Replace memory_region_init_rom_device() with memory_region_init_ram() and
memory_region_set_readonly().
This fixes a guest-triggerable QEMU crash when guest tries to write to PROM.

Signed-off-by: Hervé Poussineau <hpoussin@reactos.org>
[leon.alrae@imgtec.com: shorten subject length]
Signed-off-by: Leon Alrae <leon.alrae@imgtec.com>

diff --git a/hw/net/dp8393x.c b/hw/net/dp8393x.c
index 0f45146..ab607e4 100644 (file)
--- a/hw/net/dp8393x.c
+++ b/hw/net/dp8393x.c
@@ -831,6 +831,7 @@ static void dp8393x_realize(DeviceState *dev, Error **errp)
     dp8393xState *s = DP8393X(dev);
     int i, checksum;
     uint8_t *prom;
+    Error *local_err = NULL;
 
     address_space_init(&s->as, s->dma_mr, "dp8393x");
     memory_region_init_io(&s->mmio, OBJECT(dev), &dp8393x_ops, s,
@@ -843,8 +844,13 @@ static void dp8393x_realize(DeviceState *dev, Error **errp)
     s->watchdog = timer_new_ns(QEMU_CLOCK_VIRTUAL, dp8393x_watchdog, s);
     s->regs[SONIC_SR] = 0x0004; /* only revision recognized by Linux */
 
-    memory_region_init_rom_device(&s->prom, OBJECT(dev), NULL, NULL,
-                                  "dp8393x-prom", SONIC_PROM_SIZE, NULL);
+    memory_region_init_ram(&s->prom, OBJECT(dev),
+                           "dp8393x-prom", SONIC_PROM_SIZE, &local_err);
+    if (local_err) {
+        error_propagate(errp, local_err);
+        return;
+    }
+    memory_region_set_readonly(&s->prom, true);
     prom = memory_region_get_ram_ptr(&s->prom);
     checksum = 0;
     for (i = 0; i < 6; i++) {