Patch "um: virtio_uml: free command if adding to virtqueue failed" has been added to the 5.15-stable tree

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This is a note to let you know that I've just added the patch titled

    um: virtio_uml: free command if adding to virtqueue failed

to the 5.15-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     um-virtio_uml-free-command-if-adding-to-virtqueue-fa.patch
and it can be found in the queue-5.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 17965b196feaf65b147ea05feae8f41f62c43c7e
Author: Benjamin Berg <benjamin.berg@xxxxxxxxx>
Date:   Thu Feb 9 10:00:02 2023 +0100

    um: virtio_uml: free command if adding to virtqueue failed
    
    [ Upstream commit 8a6ca543646f2940832665dbf4e04105262505e2 ]
    
    If adding the command fails (i.e. the virtqueue is broken) then free it
    again if the function allocated a new buffer for it.
    
    Fixes: 68f5d3f3b654 ("um: add PCI over virtio emulation driver")
    Signed-off-by: Benjamin Berg <benjamin.berg@xxxxxxxxx>
    Signed-off-by: Richard Weinberger <richard@xxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/arch/um/drivers/virt-pci.c b/arch/um/drivers/virt-pci.c
index 0ab58016db22f..2829347d1e906 100644
--- a/arch/um/drivers/virt-pci.c
+++ b/arch/um/drivers/virt-pci.c
@@ -131,8 +131,11 @@ 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);



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