From: Xuan Zhuo xuanzhuo@linux.alibaba.com
[ Upstream commit 840b2d39a2dc1b96deb3f5c7fef76c9b24f08f51 ]
Add kmsan for virtqueue_dma_map_single_attrs to fix:
BUG: KMSAN: uninit-value in receive_buf+0x45ca/0x6990 receive_buf+0x45ca/0x6990 virtnet_poll+0x17e0/0x3130 net_rx_action+0x832/0x26e0 handle_softirqs+0x330/0x10f0 [...]
Uninit was created at: __alloc_pages_noprof+0x62a/0xe60 alloc_pages_noprof+0x392/0x830 skb_page_frag_refill+0x21a/0x5c0 virtnet_rq_alloc+0x50/0x1500 try_fill_recv+0x372/0x54c0 virtnet_open+0x210/0xbe0 __dev_open+0x56e/0x920 __dev_change_flags+0x39c/0x2000 dev_change_flags+0xaa/0x200 do_setlink+0x197a/0x7420 rtnl_setlink+0x77c/0x860 [...]
Signed-off-by: Xuan Zhuo xuanzhuo@linux.alibaba.com Tested-by: Alexander Potapenko glider@google.com Message-Id: 20240606111345.93600-1-xuanzhuo@linux.alibaba.com Signed-off-by: Michael S. Tsirkin mst@redhat.com Tested-by: Ilya Leoshkevich iii@linux.ibm.com # s390x Acked-by: Jason Wang jasowang@redhat.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/virtio/virtio_ring.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c index 2a972752ff1bc..9d3a9942c8c82 100644 --- a/drivers/virtio/virtio_ring.c +++ b/drivers/virtio/virtio_ring.c @@ -3121,8 +3121,10 @@ dma_addr_t virtqueue_dma_map_single_attrs(struct virtqueue *_vq, void *ptr, { struct vring_virtqueue *vq = to_vvq(_vq);
- if (!vq->use_dma_api) + if (!vq->use_dma_api) { + kmsan_handle_dma(virt_to_page(ptr), offset_in_page(ptr), size, dir); return (dma_addr_t)virt_to_phys(ptr); + }
return dma_map_single_attrs(vring_dma_dev(vq), ptr, size, dir, attrs); }