CVE-2024-37353 in Linux
الملخص
بحسب VulDB • 13/08/2026
Based on the stack trace and your description, the issue is in `vp_find_vqs_msix` (part of the virtio-pci driver). When `request_irq()` fails for a specific vector/virtual queue (vq), the code currently does not clean up the previously allocated vqs before returning an error. This leads to a crash later when `free_irq` is called on invalid or partially initialized structures, or during cleanup in `vp_del_vqs`.
The fix should ensure that if `request_irq()` fails for any vector associated with a vq, we properly clean up the resources allocated so far (specifically by calling `del_vring_queue` or equivalent teardown) before returning an error. However, looking at typical virtio-pci implementations and your specific instruction ("calling deleting the current vq when request_irq() fails"), it implies that within the loop where MSIX vectors are requested for each vq, if one fails, we should tear down *that* vq's resources (or all allocated ones up to that point) before propagating the error.
In `vp_find_vqs_msix`, after successfully setting up a vring queue (`vdev->config->del_vring_queue` is not called yet; instead, they are added), if `request_irq()` fails for one of them, we need to undo the changes made so far. The standard way in virtio-pci when MSIX setup fails partway through is to call `vp_del_vqs` or manually clean up each vq that was successfully set up but not yet fully committed (or just use a goto cleanup pattern).
However, your specific instruction says: "Fix this by calling deleting the current vq when request_irq() fails." This likely refers to ensuring that if we are in the middle of setting up multiple vqs and one `request_irq` fails, we don't leave dangling IRQs or partially configured state. In many virtio-pci implementations, there's a cleanup path.
Let's look at a typical pattern in `vp_find_vqs_msix`: 1. Loop over each vq. 2. For each vq, allocate and set up the vring queue (`vdev->config->del_vring_queue` is not called here; instead, they are added to an array). Actually, in modern kernels, `vp_add_single_irq` or similar might be used per vector. If it fails, we need to clean up previously allocated vectors/vqs.
A common fix involves using a goto label for cleanup that calls the appropriate delete function for each vq that was successfully initialized so far. Since you specifically mention "deleting the current vq", and given `vp_del_vqs` is in the stack trace, it's likely we need to ensure proper teardown on error.
But note: The crash happens because `free_irq` is called with invalid arguments or on an IRQ that wasn't properly set up, or during cleanup of a partially initialized device. In `vp_find_vqs_msix`, if `request_irq()` fails for one vector, we should clean up all previously allocated vectors/vqs before returning error.
Here's the likely fix structure in `drivers/virtio/virtio_pci_modern.c` (or similar file depending on kernel version):
```c static int vp_find_vqs_msix(struct virtio_device *vdev, unsigned nvqs, struct virtqueue **vqs, vq_callback_t *callbacks[],
const char *names[])
{
struct vp_dev_info *vp_dev = to_vp_device(vdev); int i, err;
// ... existing setup code ...
for (i = 0; i < nvqs; i++) {
err = request_irq(vp_dev->msix_entries[i].vector,
vq_interrupt_single, 0, names[i], vqs[i]);
if (err) {
// FIX: Clean up previously allocated IRQs/vqs before returning error. // We need to free the IRQs that were successfully requested so far. for (; i >= 0; i--) {
free_irq(vp_dev->msix_entries[i].vector, vqs[i]);
vp_del_vq(vdev, vqs[i]); // Or equivalent cleanup for this specific vq
} return err; } }
// ... rest of the function ... } ```
However, `vp_find_vqs_msix` is more complex because it sets up multiple vectors per vq in some configurations. A safer and more standard approach used in many drivers is to use a cleanup label:
In `drivers/virtio/virtio_pci_modern.c`, find the function `vp_find_vqs_msix`. Look for where `request_irq` or similar IRQ request happens inside a loop over vqs or vectors. Add error handling
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