[Qemu-stable] [PATCH v2 1/2] vfio-ccw: fix memory leaks in vfio_ccw_realize()

[Greg Kurz]

If the subchannel is already attached or if vfio_get_device() fails, the
code jumps to the 'out_device_err' label and doesn't free the string it
has just allocated.

The code should be reworked so that vcdev->vdev.name only gets set when
the device has been attached, and freed when it is about to be detached.
This could be achieved  with the addition of a vfio_ccw_get_device()
function that would be the counterpart of vfio_put_device(). But this is
a more elaborate cleanup that should be done in a follow-up. For now,
let's just add calls to g_free() on the buggy error paths.

Signed-off-by: Greg Kurz <address@hidden>
---
 hw/vfio/ccw.c |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/hw/vfio/ccw.c b/hw/vfio/ccw.c
index 4e5855741a64..fe34b507699f 100644
--- a/hw/vfio/ccw.c
+++ b/hw/vfio/ccw.c
@@ -357,11 +357,13 @@ static void vfio_ccw_realize(DeviceState *dev, Error 
**errp)
         if (strcmp(vbasedev->name, vcdev->vdev.name) == 0) {
             error_setg(&err, "vfio: subchannel %s has already been attached",
                        vcdev->vdev.name);
+            g_free(vcdev->vdev.name);
             goto out_device_err;
         }
     }
 
     if (vfio_get_device(group, cdev->mdevid, &vcdev->vdev, &err)) {
+        g_free(vcdev->vdev.name);
         goto out_device_err;
     }