On Sun 27 Feb 07:53 CST 2022, Krzysztof Kozlowski wrote:
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") Cc: stable@vger.kernel.org Signed-off-by: Krzysztof Kozlowski krzysztof.kozlowski@canonical.com
Reviewed-by: Bjorn Andersson bjorn.andersson@linaro.org
Regards, Bjorn
drivers/rpmsg/rpmsg_core.c | 3 ++- drivers/rpmsg/rpmsg_internal.h | 13 +++++++++++-- drivers/rpmsg/rpmsg_ns.c | 14 ++++++++++++-- include/linux/rpmsg.h | 6 ++++-- 4 files changed, 29 insertions(+), 7 deletions(-)
diff --git a/drivers/rpmsg/rpmsg_core.c b/drivers/rpmsg/rpmsg_core.c index d9e612f4f0f2..6e2bf2742973 100644 --- a/drivers/rpmsg/rpmsg_core.c +++ b/drivers/rpmsg/rpmsg_core.c @@ -397,7 +397,8 @@ field##_store(struct device *dev, struct device_attribute *attr, \ const char *buf, size_t sz) \ { \ struct rpmsg_device *rpdev = to_rpmsg_device(dev); \
- char *new, *old; \
- const char *old; \
- char *new; \ \ new = kstrndup(buf, sz, GFP_KERNEL); \ if (!new) \
diff --git a/drivers/rpmsg/rpmsg_internal.h b/drivers/rpmsg/rpmsg_internal.h index b1245d3ed7c6..31345d6e9a7e 100644 --- a/drivers/rpmsg/rpmsg_internal.h +++ b/drivers/rpmsg/rpmsg_internal.h @@ -92,10 +92,19 @@ int rpmsg_release_channel(struct rpmsg_device *rpdev, */ static inline int rpmsg_chrdev_register_device(struct rpmsg_device *rpdev) {
- int ret;
- strcpy(rpdev->id.name, "rpmsg_chrdev");
- rpdev->driver_override = "rpmsg_chrdev";
- ret = driver_set_override(&rpdev->dev, &rpdev->driver_override,
"rpmsg_chrdev", strlen("rpmsg_chrdev"));- 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..95a51543f5ad 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,
"rpmsg_ns", strlen("rpmsg_ns"));- 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