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um: virtio_uml: free command if adding to virtqueue failed

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[ 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@intel.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Benjamin Berg 2023-02-09 10:00:02 +01:00 committed by Greg Kroah-Hartman
parent 8ba6b0fade
commit 1b1ef45d48
1 changed files with 4 additions and 1 deletions
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5
arch/um/drivers/virt-pci.c
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@ -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);