linux-kernel - [PATCH] rpmsg: glink: Avoid infinite loop on intent for missing channel

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Date:   Mon, 9 Jan 2023 14:38:01 -0800
From:   Bjorn Andersson <quic_bjorande@...cinc.com>
To:     Bjorn Andersson <andersson@...nel.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>
CC:     Sricharan Ramabadhran <quic_srichara@...cinc.com>,
        Arun Kumar Neelakantam <quic_aneelaka@...cinc.com>,
        <linux-arm-msm@...r.kernel.org>,
        <linux-remoteproc@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH] rpmsg: glink: Avoid infinite loop on intent for missing channel

In the event that an intent advertisement arrives on an unknown channel
the fifo is not advanced, resulting in the same message being handled
over and over.

Fixes: dacbb35e930f ("rpmsg: glink: Receive and store the remote intent buffers")
Signed-off-by: Bjorn Andersson <quic_bjorande@...cinc.com>
---
 drivers/rpmsg/qcom_glink_native.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/rpmsg/qcom_glink_native.c b/drivers/rpmsg/qcom_glink_native.c
index f36740cb6866..7b1320b1579e 100644
--- a/drivers/rpmsg/qcom_glink_native.c
+++ b/drivers/rpmsg/qcom_glink_native.c
@@ -946,12 +946,12 @@ static void qcom_glink_handle_intent(struct qcom_glink *glink,
 	spin_unlock_irqrestore(&glink->idr_lock, flags);
 	if (!channel) {
 		dev_err(glink->dev, "intents for non-existing channel\n");
-		return;
+		goto advance_rx;
 	}
 
 	msg = kmalloc(msglen, GFP_ATOMIC);
 	if (!msg)
-		return;
+		goto advance_rx;
 
 	qcom_glink_rx_peak(glink, msg, 0, msglen);
 
@@ -973,6 +973,7 @@ static void qcom_glink_handle_intent(struct qcom_glink *glink,
 	}
 
 	kfree(msg);
+advance_rx:
 	qcom_glink_rx_advance(glink, ALIGN(msglen, 8));
 }
 
-- 
2.37.3