[RFC 1/5] libvhost-user: Add vu_rem_mem_reg input validation

[Raphael Norwitz]

Signed-off-by: Raphael Norwitz <raphael.norwitz@nutanix.com>
---
 subprojects/libvhost-user/libvhost-user.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/subprojects/libvhost-user/libvhost-user.c 
b/subprojects/libvhost-user/libvhost-user.c
index 787f4d2d4f..573212a83b 100644
--- a/subprojects/libvhost-user/libvhost-user.c
+++ b/subprojects/libvhost-user/libvhost-user.c
@@ -801,6 +801,12 @@ vu_rem_mem_reg(VuDev *dev, VhostUserMsg *vmsg) {
     VuDevRegion shadow_regions[VHOST_USER_MAX_RAM_SLOTS] = {};
     VhostUserMemoryRegion m = vmsg->payload.memreg.region, *msg_region = &m;
 
+    if (vmsg->fd_num != 1 ||
+        vmsg->size != sizeof(vmsg->payload.memreg)) {
+        vu_panic(dev, "VHOST_USER_REM_MEM_REG received multiple regions");
+        return true;
+    }
+
     DPRINT("Removing region:\n");
     DPRINT("    guest_phys_addr: 0x%016"PRIx64"\n",
            msg_region->guest_phys_addr);
-- 
2.20.1