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 6.1-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-6.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 2e39cf7b8f86c3be306985b9b0185f46f1b10b28
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 3ac220dafec4a..3b637ad75ec81 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);
