From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
"Rafael J. Wysocki" <rafael@kernel.org>
Cc: Stuart Yoder <stuyoder@gmail.com>,
"K. Y. Srinivasan" <kys@microsoft.com>,
Haiyang Zhang <haiyangz@microsoft.com>,
Stephen Hemminger <sthemmin@microsoft.com>,
Wei Liu <wei.liu@kernel.org>, Dexuan Cui <decui@microsoft.com>,
Bjorn Helgaas <bhelgaas@google.com>,
Bjorn Andersson <bjorn.andersson@linaro.org>,
Mathieu Poirier <mathieu.poirier@linaro.org>,
Vineeth Vijayan <vneethv@linux.ibm.com>,
Peter Oberparleiter <oberpar@linux.ibm.com>,
Heiko Carstens <hca@linux.ibm.com>,
Vasily Gorbik <gor@linux.ibm.com>,
Alexander Gordeev <agordeev@linux.ibm.com>,
Christian Borntraeger <borntraeger@linux.ibm.com>,
Sven Schnelle <svens@linux.ibm.com>,
Andy Gross <agross@kernel.org>,
linux-kernel@vger.kernel.org, linux-clk@vger.kernel.org,
NXP Linux Team <linux-imx@nxp.com>,
linux-arm-kernel@lists.infradead.org,
linux-hyperv@vger.kernel.org, linux-pci@vger.kernel.org,
linux-remoteproc@vger.kernel.org, linux-s390@vger.kernel.org,
linux-arm-msm@vger.kernel.org, alsa-devel@alsa-project.org,
linux-spi@vger.kernel.org,
virtualization@lists.linux-foundation.org,
Linus Torvalds <torvalds@linux-foundation.org>,
Rasmus Villemoes <linux@rasmusvillemoes.dk>,
Andy Shevchenko <andy.shevchenko@gmail.com>,
Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Subject: [PATCH v7 12/12] rpmsg: Fix kfree() of static memory on setting driver_override
Date: Tue, 19 Apr 2022 13:34:35 +0200 [thread overview]
Message-ID: <20220419113435.246203-13-krzysztof.kozlowski@linaro.org> (raw)
In-Reply-To: <20220419113435.246203-1-krzysztof.kozlowski@linaro.org>
The driver_override field from platform driver should not be initialized
from static memory (string literal) because the core later kfree() it,
for example when driver_override is set via sysfs.
Use dedicated helper to set driver_override properly.
Fixes: 950a7388f02b ("rpmsg: Turn name service into a stand alone driver")
Fixes: c0cdc19f84a4 ("rpmsg: Driver for user space endpoint interface")
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
---
drivers/rpmsg/rpmsg_internal.h | 13 +++++++++++--
drivers/rpmsg/rpmsg_ns.c | 14 ++++++++++++--
include/linux/rpmsg.h | 6 ++++--
3 files changed, 27 insertions(+), 6 deletions(-)
diff --git a/drivers/rpmsg/rpmsg_internal.h b/drivers/rpmsg/rpmsg_internal.h
index d4b23fd019a8..3e81642238d2 100644
--- a/drivers/rpmsg/rpmsg_internal.h
+++ b/drivers/rpmsg/rpmsg_internal.h
@@ -94,10 +94,19 @@ int rpmsg_release_channel(struct rpmsg_device *rpdev,
*/
static inline int rpmsg_ctrldev_register_device(struct rpmsg_device *rpdev)
{
+ int ret;
+
strcpy(rpdev->id.name, "rpmsg_ctrl");
- rpdev->driver_override = "rpmsg_ctrl";
+ ret = driver_set_override(&rpdev->dev, &rpdev->driver_override,
+ rpdev->id.name, strlen(rpdev->id.name));
+ if (ret)
+ return ret;
+
+ ret = rpmsg_register_device(rpdev);
+ if (ret)
+ kfree(rpdev->driver_override);
- return rpmsg_register_device(rpdev);
+ return ret;
}
#endif
diff --git a/drivers/rpmsg/rpmsg_ns.c b/drivers/rpmsg/rpmsg_ns.c
index 762ff1ae279f..8eb8f328237e 100644
--- a/drivers/rpmsg/rpmsg_ns.c
+++ b/drivers/rpmsg/rpmsg_ns.c
@@ -20,12 +20,22 @@
*/
int rpmsg_ns_register_device(struct rpmsg_device *rpdev)
{
+ int ret;
+
strcpy(rpdev->id.name, "rpmsg_ns");
- rpdev->driver_override = "rpmsg_ns";
+ ret = driver_set_override(&rpdev->dev, &rpdev->driver_override,
+ rpdev->id.name, strlen(rpdev->id.name));
+ if (ret)
+ return ret;
+
rpdev->src = RPMSG_NS_ADDR;
rpdev->dst = RPMSG_NS_ADDR;
- return rpmsg_register_device(rpdev);
+ ret = rpmsg_register_device(rpdev);
+ if (ret)
+ kfree(rpdev->driver_override);
+
+ return ret;
}
EXPORT_SYMBOL(rpmsg_ns_register_device);
diff --git a/include/linux/rpmsg.h b/include/linux/rpmsg.h
index 02fa9116cd60..20c8cd1cde21 100644
--- a/include/linux/rpmsg.h
+++ b/include/linux/rpmsg.h
@@ -41,7 +41,9 @@ struct rpmsg_channel_info {
* rpmsg_device - device that belong to the rpmsg bus
* @dev: the device struct
* @id: device id (used to match between rpmsg drivers and devices)
- * @driver_override: driver name to force a match
+ * @driver_override: driver name to force a match; do not set directly,
+ * because core frees it; use driver_set_override() to
+ * set or clear it.
* @src: local address
* @dst: destination address
* @ept: the rpmsg endpoint of this channel
@@ -51,7 +53,7 @@ struct rpmsg_channel_info {
struct rpmsg_device {
struct device dev;
struct rpmsg_device_id id;
- char *driver_override;
+ const char *driver_override;
u32 src;
u32 dst;
struct rpmsg_endpoint *ept;
--
2.32.0
next prev parent reply other threads:[~2022-04-19 11:35 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-19 11:34 [PATCH v7 00/12] Fix broken usage of driver_override (and kfree of static memory) Krzysztof Kozlowski
2022-04-19 11:34 ` [PATCH v7 01/12] driver: platform: Add helper for safer setting of driver_override Krzysztof Kozlowski
2022-04-20 17:12 ` Rafael J. Wysocki
2022-04-19 11:34 ` [PATCH v7 02/12] amba: Use driver_set_override() instead of open-coding Krzysztof Kozlowski
2022-04-19 11:34 ` [PATCH v7 03/12] fsl-mc: " Krzysztof Kozlowski
2022-04-19 11:34 ` [PATCH v7 04/12] hv: " Krzysztof Kozlowski
2022-04-19 11:34 ` [PATCH v7 05/12] PCI: " Krzysztof Kozlowski
2022-04-19 11:34 ` [PATCH v7 06/12] s390/cio: " Krzysztof Kozlowski
2022-04-19 11:34 ` [PATCH v7 07/12] spi: Use helper for safer setting of driver_override Krzysztof Kozlowski
2022-04-19 11:34 ` [PATCH v7 08/12] vdpa: " Krzysztof Kozlowski
2022-04-19 11:34 ` [PATCH v7 09/12] clk: imx: scu: Fix kfree() of static memory on setting driver_override Krzysztof Kozlowski
2022-04-23 16:09 ` Abel Vesa
2022-04-19 11:34 ` [PATCH v7 10/12] slimbus: qcom-ngd: " Krzysztof Kozlowski
2022-04-19 11:34 ` [PATCH v7 11/12] rpmsg: Constify local variable in field store macro Krzysztof Kozlowski
2022-04-19 11:34 ` Krzysztof Kozlowski [this message]
[not found] ` <CGME20220429122942eucas1p1820d0cd17a871d4953bac2b3de1dcdd9@eucas1p1.samsung.com>
2022-04-29 12:29 ` [PATCH v7 12/12] rpmsg: Fix kfree() of static memory on setting driver_override Marek Szyprowski
2022-04-29 14:16 ` Krzysztof Kozlowski
2022-04-29 14:51 ` Marek Szyprowski
2022-04-29 18:29 ` Krzysztof Kozlowski
2022-04-20 9:20 ` [PATCH v7 00/12] Fix broken usage of driver_override (and kfree of static memory) Krzysztof Kozlowski
2022-04-22 14:54 ` Greg Kroah-Hartman
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