[PATCH 1/4] um: virtio_uml: free command if adding to virtqueue failed

[benjamin at sipsolutions.net]

From: Benjamin Berg <benjamin.berg at intel.com>

If adding the command fails (i.e. the virtqueue is broken) then free it
again if the function allocated a new buffer for it.

Change-Id: I03d2c687aeccb8bc8da280925ffdaeb8fb70eee7
Fixes: 68f5d3f3b654 ("um: add PCI over virtio emulation driver")
Signed-off-by: Benjamin Berg <benjamin.berg at intel.com>
---
 arch/um/drivers/virt-pci.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/arch/um/drivers/virt-pci.c b/arch/um/drivers/virt-pci.c
index 3ac220dafec4..3b637ad75ec8 100644
--- a/arch/um/drivers/virt-pci.c
+++ b/arch/um/drivers/virt-pci.c
@@ -132,8 +132,11 @@ static int um_pci_send_cmd(struct um_pci_device *dev,
 				out ? 1 : 0,
 				posted ? cmd : HANDLE_NO_FREE(cmd),
 				GFP_ATOMIC);
-	if (ret)
+	if (ret) {
+		if (posted)
+			kfree(cmd);
 		goto out;
+	}
 
 	if (posted) {
 		virtqueue_kick(dev->cmd_vq);
-- 
2.39.1