CVE-2024-27066

In the Linux kernel, the following vulnerability has been resolved:

virtio: packed: fix unmap leak for indirect desc table

When use_dma_api and premapped are true, then the do_unmap is false.

Because the do_unmap is false, vring_unmap_extra_packed is not called by

detach_buf_packed.

if (unlikely(vq->do_unmap)) {

curr = id;

for (i = 0; i < state->num; i++) {

vring_unmap_extra_packed(vq,

&vq->packed.desc_extra[curr]);

curr = vq->packed.desc_extra[curr].next;

}

}

So the indirect desc table is not unmapped. This causes the unmap leak.

So here, we check vq->use_dma_api instead. Synchronously, dma info is

updated based on use_dma_api judgment

This bug does not occur, because no driver use the premapped with

indirect.