bus/vmbus: fix resource leak on error

[ upstream commit 26ed007 ]

If secondary process attempt to mmap the resource resulted in
the wrong address, then it would leave behind the bad mmap.

Coverity issue: 337675, 337664
Fixes: 2a28a50 ("bus/vmbus: map ring in secondary process")

Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>

drivers/bus/vmbus/linux/vmbus_uio.c

@@ -283,10 +283,12 @@ vmbus_uio_map_secondary_subchan(const struct rte_vmbus_device *dev,
 	if (mapaddr == MAP_FAILED)
 		VMBUS_LOG(ERR,
 			  "mmap subchan %u in secondary failed", chan->relid);
-	else
+	else {
 		VMBUS_LOG(ERR,
 			  "mmap subchan %u in secondary address mismatch",
 			  chan->relid);
+		vmbus_unmap_resource(mapaddr, 2 * ring_size);
+	}
 	return -1;
 }