Messages in this thread Patch in this message | | | From | "Andrea Parri (Microsoft)" <> | Subject | [RFC PATCH 1/6] hv_sock: Check hv_pkt_iter_first_raw()'s return value | Date | Wed, 13 Apr 2022 22:47:37 +0200 |
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The function returns NULL if the ring buffer has no enough space available for a packet descriptor. The ring buffer's write_index is in memory which is shared with the Hyper-V host, its value is thus subject to being changed at any time.
Signed-off-by: Andrea Parri (Microsoft) <parri.andrea@gmail.com> --- net/vmw_vsock/hyperv_transport.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/net/vmw_vsock/hyperv_transport.c b/net/vmw_vsock/hyperv_transport.c index e111e13b66604..943352530936e 100644 --- a/net/vmw_vsock/hyperv_transport.c +++ b/net/vmw_vsock/hyperv_transport.c @@ -603,6 +603,8 @@ static ssize_t hvs_stream_dequeue(struct vsock_sock *vsk, struct msghdr *msg, if (need_refill) { hvs->recv_desc = hv_pkt_iter_first_raw(hvs->chan); + if (!hvs->recv_desc) + return -ENOBUFS; ret = hvs_update_recv_data(hvs); if (ret) return ret; -- 2.25.1
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