linux-kernel - [PATCH 5.4 245/320] rpmsg: core: Clean up resources on announce

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Date:   Mon, 24 Jan 2022 19:43:49 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Arnaud Pouliquen <arnaud.pouliquen@...s.st.com>,
        Mathieu Poirier <mathieu.poirier@...aro.org>
Subject: [PATCH 5.4 245/320] rpmsg: core: Clean up resources on announce_create failure.

From: Arnaud Pouliquen <arnaud.pouliquen@...s.st.com>

commit 8066c615cb69b7da8a94f59379847b037b3a5e46 upstream.

During the rpmsg_dev_probe, if rpdev->ops->announce_create returns an
error, the rpmsg device and default endpoint should be freed before
exiting the function.

Fixes: 5e619b48677c ("rpmsg: Split rpmsg core and virtio backend")
Suggested-by: Bjorn Andersson <bjorn.andersson@...aro.org>
Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@...s.st.com>
Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>
Cc: stable <stable@...r.kernel.org>
Link: https://lore.kernel.org/r/20211206190758.10004-1-arnaud.pouliquen@foss.st.com
Signed-off-by: Mathieu Poirier <mathieu.poirier@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/rpmsg/rpmsg_core.c |   20 ++++++++++++++++----
 1 file changed, 16 insertions(+), 4 deletions(-)

--- a/drivers/rpmsg/rpmsg_core.c
+++ b/drivers/rpmsg/rpmsg_core.c
@@ -473,13 +473,25 @@ static int rpmsg_dev_probe(struct device
 	err = rpdrv->probe(rpdev);
 	if (err) {
 		dev_err(dev, "%s: failed: %d\n", __func__, err);
-		if (ept)
-			rpmsg_destroy_ept(ept);
-		goto out;
+		goto destroy_ept;
 	}
 
-	if (ept && rpdev->ops->announce_create)
+	if (ept && rpdev->ops->announce_create) {
 		err = rpdev->ops->announce_create(rpdev);
+		if (err) {
+			dev_err(dev, "failed to announce creation\n");
+			goto remove_rpdev;
+		}
+	}
+
+	return 0;
+
+remove_rpdev:
+	if (rpdrv->remove)
+		rpdrv->remove(rpdev);
+destroy_ept:
+	if (ept)
+		rpmsg_destroy_ept(ept);
 out:
 	return err;
 }