Subject: [PATCH net v3] hv_sock: Report EOF instead of -EIO for FIN

From: Dexuan Cui <[email-masked]>
Date: Mon, 20 Apr 2026 19:59:50 -0700

Commit f0c5827d07cb unluckily causes a regression for the FIN packet,
and the final read syscall gets an error rather than 0.

Ideally, we would want to fix hvs_channel_readable_payload() so that it
could return 0 in the FIN scenario, but it's not good for the hv_sock
driver to use the VMBus ringbuffer's cached priv_read_index, which is
internal data in the VMBus driver.

Fix the regression in hv_sock by returning 0 rather than -EIO.

In case we see a malformed/short packet, we still return -EIO.

Fixes: f0c5827d07cb ("hv_sock: Return the readable bytes in hvs_stream_has_data()")
Cc: [email-masked]
Reported-by: Ben Hillis <[email-masked]>
Reported-by: Mitchell Levy <[email-masked]>
Signed-off-by: Dexuan Cui <[email-masked]>

---

Changes since v1:
    Removed the local variable 'need_refill' to make the code more 
    readable. Stefano, thanks!

    No other change.

Changes since v2:
    Added code to test the flag SEND_SHUTDOWN. Copilot, thanks!
    Updated the comment and the commit messages accordingly.

 net/vmw_vsock/hyperv_transport.c | 29 +++++++++++++++++++++++++----
 1 file changed, 25 insertions(+), 4 deletions(-)

diff --git a/net/vmw_vsock/hyperv_transport.c b/net/vmw_vsock/hyperv_transport.c
index 069386a74557..da150de10f0d 100644
--- a/net/vmw_vsock/hyperv_transport.c
+++ b/net/vmw_vsock/hyperv_transport.c
@@ -694,7 +694,6 @@ static ssize_t hvs_stream_enqueue(struct vsock_sock *vsk, struct msghdr *msg,
 static s64 hvs_stream_has_data(struct vsock_sock *vsk)
 {
 	struct hvsock *hvs = vsk->trans;
-	bool need_refill;
 	s64 ret;
 
 	if (hvs->recv_data_len > 0)
@@ -702,9 +701,31 @@ static s64 hvs_stream_has_data(struct vsock_sock *vsk)
 
 	switch (hvs_channel_readable_payload(hvs->chan)) {
 	case 1:
-		need_refill = !hvs->recv_desc;
-		if (!need_refill)
-			return -EIO;
+		if (hvs->recv_desc) {
+			/* Here hvs->recv_data_len is 0, so hvs->recv_desc must
+			 * be NULL unless it points to the 0-byte-payload FIN
+			 * packet or a malformed/short packet: see
+			 * hvs_update_recv_data().
+			 *
+			 * If hvs->recv_desc points to the FIN packet, here all
+			 * the payload has been dequeued and the peer_shutdown
+			 * flag is set, but hvs_channel_readable_payload() still
+			 * returns 1, because the VMBus ringbuffer's read_index
+			 * is not updated for the FIN packet:
+			 * hvs_stream_dequeue() -> hv_pkt_iter_next() updates
+			 * the cached priv_read_index but has no opportunity to
+			 * update the read_index in hv_pkt_iter_close() as
+			 * hvs_stream_has_data() returns 0 for the FIN packet,
+			 * so it won't get dequeued.
+			 *
+			 * In case hvs->recv_desc points to a malformed/short
+			 * packet, return -EIO.
+			 */
+			if (hvs->vsk->peer_shutdown & SEND_SHUTDOWN)
+				return 0;
+			else
+				return -EIO;
+		}
 
 		hvs->recv_desc = hv_pkt_iter_first(hvs->chan);
 		if (!hvs->recv_desc)
-- 
2.49.0