From: Philip Chen <philipchen@chromium.org> stable inclusion from stable-v5.10.227 commit 4ce662fe4be6fbc2595d9ef4888b2b6e778c99ed category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IB2YUI CVE: CVE-2024-50184 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=... ------------------------------------------------- [ Upstream commit e25fbcd97cf52c3c9824d44b5c56c19673c3dd50 ] If a pmem device is in a bad status, the driver side could wait for host ack forever in virtio_pmem_flush(), causing the system to hang. So add a status check in the beginning of virtio_pmem_flush() to return early if the device is not activated. Signed-off-by: Philip Chen <philipchen@chromium.org> Message-Id: <20240826215313.2673566-1-philipchen@chromium.org> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Acked-by: Pankaj Gupta <pankaj.gupta.linux@gmail.com Signed-off-by: Sasha Levin <sashal@kernel.org> --- drivers/nvdimm/nd_virtio.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/drivers/nvdimm/nd_virtio.c b/drivers/nvdimm/nd_virtio.c index 10351d5b49fa..41e97c6567cf 100644 --- a/drivers/nvdimm/nd_virtio.c +++ b/drivers/nvdimm/nd_virtio.c @@ -44,6 +44,15 @@ static int virtio_pmem_flush(struct nd_region *nd_region) unsigned long flags; int err, err1; + /* + * Don't bother to submit the request to the device if the device is + * not activated. + */ + if (vdev->config->get_status(vdev) & VIRTIO_CONFIG_S_NEEDS_RESET) { + dev_info(&vdev->dev, "virtio pmem device needs a reset\n"); + return -EIO; + } + might_sleep(); req_data = kmalloc(sizeof(*req_data), GFP_KERNEL); if (!req_data) -- 2.34.1