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vsock/virtio: fix skb overhead overflow on 32-bit builds

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On 32-bit architectures, both skb_queue_len() and SKB_TRUESIZE(0) evaluate
to 32-bit values. The multiplication can overflow before being assigned to
the u64 skb_overhead variable, making the skb overhead check ineffective.

Cast skb_queue_len() to u64 so the multiplication is always performed in
64-bit arithmetic.

This issue was reported by Sashiko while reviewing another patch.

Fixes: 059b7dbd20 ("vsock/virtio: fix potential unbounded skb queue")
Closes: https://sashiko.dev/#/patchset/20260518090656.134588-1-sgarzare%40redhat.com
Cc: stable@vger.kernel.org
Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Link: https://patch.msgid.link/20260521124732.125771-1-sgarzare@redhat.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Stefano Garzarella 2026-05-21 14:47:32 +02:00 committed by Jakub Kicinski
parent 3589d20a66
commit 4157501b9a
1 changed files with 1 additions and 1 deletions
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2
net/vmw_vsock/virtio_transport_common.c
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@ -417,7 +417,7 @@ static int virtio_transport_send_pkt_info(struct vsock_sock *vsk,
static bool virtio_transport_inc_rx_pkt(struct virtio_vsock_sock *vvs,
u32 len)
{
u64 skb_overhead = (skb_queue_len(&vvs->rx_queue) + 1) * SKB_TRUESIZE(0);
u64 skb_overhead = ((u64)skb_queue_len(&vvs->rx_queue) + 1) * SKB_TRUESIZE(0);
/* Allow at most buf_alloc * 2 total budget (payload + overhead),
* similar to how SO_RCVBUF is doubled to reserve space for sk_buff