Messages in this thread Patch in this message | | | From | Jiasheng Jiang <> | Subject | [PATCH] virtio_ring: Check null pointer | Date | Fri, 24 Dec 2021 18:10:07 +0800 |
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As the alloc_indirect_packed() returns kmalloc_array() that could allocation fail and return null pointer, it should be check in order to prevent the dereference of null pointer.
Fixes: 1ce9e6055fa0 ("virtio_ring: introduce packed ring support") Signed-off-by: Jiasheng Jiang <jiasheng@iscas.ac.cn> --- drivers/virtio/virtio_ring.c | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c index 71e16b53e9c1..30fd925165ac 100644 --- a/drivers/virtio/virtio_ring.c +++ b/drivers/virtio/virtio_ring.c @@ -991,7 +991,12 @@ static int virtqueue_add_indirect_packed(struct vring_virtqueue *vq, dma_addr_t addr; head = vq->packed.next_avail_idx; + desc = alloc_indirect_packed(total_sg, gfp); + if (!desc) { + END_USE(vq); + return -ENOMEM; + } if (unlikely(vq->vq.num_free < 1)) { pr_debug("Can't add buf len 1 - avail = 0\n"); -- 2.25.1
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