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From: Arnaud Pouliquen <arnaud.pouliquen@foss.st.com>
To: Bjorn Andersson <bjorn.andersson@linaro.org>,
	Ohad Ben-Cohen <ohad@wizery.com>,
	Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: <linux-remoteproc@vger.kernel.org>,
	<linux-kernel@vger.kernel.org>,
	<linux-stm32@st-md-mailman.stormreply.com>,
	<arnaud.pouliquen@foss.st.com>
Subject: [PATCH v2 7/7] rpmsg: char: Return error if user tries to destroy a default endpoint.
Date: Tue, 13 Apr 2021 15:44:58 +0200
Message-ID: <20210413134458.17912-8-arnaud.pouliquen@foss.st.com> (raw)
In-Reply-To: <20210413134458.17912-1-arnaud.pouliquen@foss.st.com>

Using the RPMSG_DESTROY_EPT_IOCTL control, user application can
destroy an endpoint. This patch prevents to destroy a default endpoint
associated to a channel.

This update is needed to manage the "rpmsg-raw" channel. In this
case a default endpoint is used and destroying it without the
channel does not make sense.

Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@foss.st.com>
---
 drivers/rpmsg/rpmsg_char.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/rpmsg/rpmsg_char.c b/drivers/rpmsg/rpmsg_char.c
index fa59abfa8878..d4316bb904f2 100644
--- a/drivers/rpmsg/rpmsg_char.c
+++ b/drivers/rpmsg/rpmsg_char.c
@@ -280,6 +280,10 @@ static long rpmsg_eptdev_ioctl(struct file *fp, unsigned int cmd,
 	if (cmd != RPMSG_DESTROY_EPT_IOCTL)
 		return -EINVAL;
 
+	/* Don't allow to destroy a default endpoint. */
+	if (!eptdev->rpdev || eptdev->ept == eptdev->rpdev->ept)
+		return -EPERM;
+
 	return rpmsg_chrdev_destroy_eptdev(&eptdev->dev, NULL);
 }
 
-- 
2.17.1


      parent reply index

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-13 13:44 [PATCH v2 0/7] Restructure the rpmsg char and introduce the rpmsg-raw channel Arnaud Pouliquen
2021-04-13 13:44 ` [PATCH v2 1/7] rpmsg: char: Export eptdev create an destroy functions Arnaud Pouliquen
2021-04-21 17:52   ` Mathieu Poirier
2021-04-22  7:55     ` Arnaud POULIQUEN
2021-04-22 16:29       ` Mathieu Poirier
2021-04-13 13:44 ` [PATCH v2 2/7] rpmsg: Move the rpmsg control device from rpmsg_char to rpmsg_ctrl Arnaud Pouliquen
2021-04-21 18:04   ` Mathieu Poirier
2021-04-22  7:56     ` Arnaud POULIQUEN
2021-04-22 16:32       ` Mathieu Poirier
2021-04-22 16:41         ` Arnaud POULIQUEN
2021-04-13 13:44 ` [PATCH v2 3/7] rpmsg: Update rpmsg_chrdev_register_device function Arnaud Pouliquen
2021-04-21 18:06   ` Mathieu Poirier
2021-04-13 13:44 ` [PATCH v2 4/7] rpmsg: char: Introduce __rpmsg_chrdev_create_eptdev function Arnaud Pouliquen
2021-04-21 17:43   ` Mathieu Poirier
2021-04-21 17:45     ` Mathieu Poirier
2021-04-13 13:44 ` [PATCH v2 5/7] rpmsg: char: Introduce a rpmsg driver for the rpmsg char device Arnaud Pouliquen
2021-04-21 17:40   ` Mathieu Poirier
2021-04-22  7:58     ` Arnaud POULIQUEN
2021-04-22 16:36       ` Mathieu Poirier
2021-04-22 16:53         ` Arnaud POULIQUEN
2021-04-28 13:05         ` Arnaud POULIQUEN
2021-04-13 13:44 ` [PATCH v2 6/7] rpmsg: char: No dynamic endpoint management for the default one Arnaud Pouliquen
2021-04-13 13:44 ` Arnaud Pouliquen [this message]

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