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drivers: virtio: fix cleanup upon failure during virtqueues initialization

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This commit fixes infinite loop reported in
https://github.com/zephyrproject-rtos/zephyr/issues/91242, not deallocating
array with virtqueues and not deactivating the virtqueues in case of
failure

Signed-off-by: Jakub Michalski <jmichalski@antmicro.com>
This commit is contained in:
Jakub Michalski 2025-06-09 13:10:32 +02:00 • committed by Henrik Brix Andersen
commit c47cc3abda
2 changed files with 47 additions and 20 deletions
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33
drivers/virtio/virtio_mmio.c
View file

@ -246,30 +246,43 @@ static int virtio_mmio_set_virtqueues(const struct device *dev, uint16_t queue_c
}
data->virtqueue_count = queue_count;
int ret = 0;
int created_queues = 0;
int activated_queues = 0;
for (int i = 0; i < queue_count; i++) {
virtio_mmio_write32(dev, VIRTIO_MMIO_QUEUE_SEL, i);
const uint16_t queue_size =
cb(i, virtio_mmio_read32(dev, VIRTIO_MMIO_QUEUE_SIZE_MAX), opaque);
int ret = virtq_create(&data->virtqueues[i], queue_size);
ret = virtq_create(&data->virtqueues[i], queue_size);
if (ret != 0) {
for (int j = 0; j < i; i++) {
virtq_free(&data->virtqueues[j]);
}
return ret;
goto fail;
}
created_queues++;
ret = virtio_mmio_set_virtqueue(dev, i, &data->virtqueues[i]);
if (ret != 0) {
for (int j = 0; j < i; i++) {
virtq_free(&data->virtqueues[j]);
}
return ret;
goto fail;
}
activated_queues++;
}
return 0;
fail:
for (int j = 0; j < activated_queues; j++) {
virtio_mmio_write32(dev, VIRTIO_MMIO_QUEUE_SEL, j);
virtio_mmio_write32(dev, VIRTIO_MMIO_QUEUE_READY, 0);
}
for (int j = 0; j < created_queues; j++) {
virtq_free(&data->virtqueues[j]);
}
k_free(data->virtqueues);
data->virtqueue_count = 0;
return ret;
}
static int virtio_mmio_init_virtqueues(const struct device *dev, uint16_t num_queues,

34
drivers/virtio/virtio_pci.c
View file

@ -271,30 +271,44 @@ static int virtio_pci_init_virtqueues(
}
data->virtqueue_count = queue_count;
int ret = 0;
int created_queues = 0;
int activated_queues = 0;
for (int i = 0; i < queue_count; i++) {
data->common_cfg->queue_select = sys_cpu_to_le16(i);
barrier_dmem_fence_full();
uint16_t queue_size = cb(i, sys_le16_to_cpu(data->common_cfg->queue_size), opaque);
int ret = virtq_create(&data->virtqueues[i], queue_size);
ret = virtq_create(&data->virtqueues[i], queue_size);
if (ret != 0) {
for (int j = 0; j < i; i++) {
virtq_free(&data->virtqueues[j]);
}
return ret;
goto fail;
}
created_queues++;
ret = virtio_pci_set_virtqueue(dev, i, &data->virtqueues[i]);
if (ret != 0) {
for (int j = 0; j < i; i++) {
virtq_free(&data->virtqueues[j]);
}
return ret;
goto fail;
}
activated_queues++;
}
return 0;
fail:
for (int j = 0; j < activated_queues; j++) {
data->common_cfg->queue_select = sys_cpu_to_le16(j);
barrier_dmem_fence_full();
data->common_cfg->queue_enable = sys_cpu_to_le16(0);
}
for (int j = 0; j < created_queues; j++) {
virtq_free(&data->virtqueues[j]);
}
k_free(data->virtqueues);
data->virtqueue_count = 0;
return ret;
}
static bool virtio_pci_map_cap(pcie_bdf_t bdf, struct virtio_pci_cap *cap, void **virt_ptr)