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-rw-r--r--hw/xen/xen_pt_config_init.c10
1 files changed, 8 insertions, 2 deletions
diff --git a/hw/xen/xen_pt_config_init.c b/hw/xen/xen_pt_config_init.c
index b1ad743754..b58bf3983c 100644
--- a/hw/xen/xen_pt_config_init.c
+++ b/hw/xen/xen_pt_config_init.c
@@ -1949,9 +1949,15 @@ static int xen_pt_config_reg_init(XenPCIPassthroughState *s,
} else
val = data;
+ if (val & ~size_mask) {
+ XEN_PT_ERR(&s->dev,"Offset 0x%04x:0x%04x expands past register size(%d)!\n",
+ offset, val, reg->size);
+ g_free(reg_entry);
+ return -ENXIO;
+ }
/* This could be just pci_set_long as we don't modify the bits
- * past reg->size, but in case this routine is run in parallel
- * we do not want to over-write other registers. */
+ * past reg->size, but in case this routine is run in parallel or the
+ * init value is larger, we do not want to over-write registers. */
switch (reg->size) {
case 1: pci_set_byte(s->dev.config + offset, (uint8_t)val);
break;