[RFT PATCH 3/3] rpmsg: fix kfree() of const memory on setting driver_override
From: Krzysztof Kozlowski <hidden>
Date: 2022-02-22 13:29:02
Also in:
alsa-devel, linux-arm-msm, linux-clk, linux-remoteproc, lkml, stable
Subsystem:
remote processor messaging (rpmsg) subsystem, the rest · Maintainers:
Bjorn Andersson, Mathieu Poirier, Linus Torvalds
The driver_override field from rpmsg_device should not be initialized
from const memory because the core later kfree() it, for example when
driver_override is set via sysfs.
Fixes: 950a7388f02b ("rpmsg: Turn name service into a stand alone driver")
Fixes: c0cdc19f84a4 ("rpmsg: Driver for user space endpoint interface")
Cc: <redacted>
Signed-off-by: Krzysztof Kozlowski <redacted>
---
drivers/rpmsg/rpmsg_internal.h | 12 ++++++++++--
drivers/rpmsg/rpmsg_ns.c | 13 +++++++++++--
2 files changed, 21 insertions(+), 4 deletions(-)
diff --git a/drivers/rpmsg/rpmsg_internal.h b/drivers/rpmsg/rpmsg_internal.h
index b1245d3ed7c6..c21e73ffbf05 100644
--- a/drivers/rpmsg/rpmsg_internal.h
+++ b/drivers/rpmsg/rpmsg_internal.h@@ -92,10 +92,18 @@ 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"; + rpdev->driver_override = kstrdup("rpmsg_chrdev", GFP_KERNEL); + if (!rpdev->driver_override) + return -ENOMEM; + + 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..7d0605307d23 100644
--- a/drivers/rpmsg/rpmsg_ns.c
+++ b/drivers/rpmsg/rpmsg_ns.c@@ -20,12 +20,21 @@ */ int rpmsg_ns_register_device(struct rpmsg_device *rpdev) { + int ret; + strcpy(rpdev->id.name, "rpmsg_ns"); - rpdev->driver_override = "rpmsg_ns"; + rpdev->driver_override = kstrdup("rpmsg_ns", GFP_KERNEL); + if (!rpdev->driver_override) + return -ENOMEM; + 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);
--
2.32.0
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