[PULL 16/22] vfio/pci: Fix a potential memory leak in vfio_listener_region_add

[Cédric Le Goater]

From: Zhenzhong Duan <zhenzhong.duan@intel.com>

When there is an failure in vfio_listener_region_add() and the section
belongs to a ram device, there is an inaccurate error report which should
never be related to vfio_dma_map failure. The memory holding err is also
incrementally leaked in each failure.

Fix it by reporting the real error and free it.

Fixes: 567b5b309ab ("vfio/pci: Relax DMA map errors for MMIO regions")
Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Signed-off-by: Cédric Le Goater <clg@redhat.com>
---
 hw/vfio/common.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hw/vfio/common.c b/hw/vfio/common.c
index 
9e61de03ee0ee611264ab9943d8e5abc1320c766..5ff5acf1d878a148b7920ce32517be878129940e
 100644
--- a/hw/vfio/common.c
+++ b/hw/vfio/common.c
@@ -763,7 +763,7 @@ static void vfio_listener_region_add(MemoryListener 
*listener,
 
 fail:
     if (memory_region_is_ram_device(section->mr)) {
-        error_report("failed to vfio_dma_map. pci p2p may not work");
+        error_reportf_err(err, "PCI p2p may not work: ");
         return;
     }
     /*
-- 
2.41.0