[PATCH 5.10 111/129] thermal: int340x: Fix attr.show callback prototype

Greg Kroah-Hartman
2022-05-04T17:06:38Z

From: Kees Cook <keescook@chromium.org>

commit d0f6cfb2bd165b0aa307750e07e03420859bd554 upstream.

Control Flow Integrity (CFI) instrumentation of the kernel noticed that
the caller, dev_attr_show(), and the callback, odvp_show(), did not have
matching function prototypes, which would cause a CFI exception to be
raised. Correct the prototype by using struct device_attribute instead
of struct kobj_attribute.

Reported-and-tested-by: Joao Moreira <joao@overdrivepizza.com>
Link: https://lore.kernel.org/lkml/067ce8bd4c3968054509831fa2347f4f@overdrivepizza.com/
Fixes: 006f006f1e5c ("thermal/int340x_thermal: Export OEM vendor variables")
Cc: 5.8+ <stable@vger.kernel.org> # 5.8+
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/thermal/intel/int340x_thermal/int3400_thermal.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/thermal/intel/int340x_thermal/int3400_thermal.c
+++ b/drivers/thermal/intel/int340x_thermal/int3400_thermal.c
@@ -67,7 +67,7 @@ static int evaluate_odvp(struct int3400_
struct odvp_attr {
int odvp;
struct int3400_thermal_priv *priv;
- struct kobj_attribute attr;
+ struct device_attribute attr;
};

static ssize_t data_vault_read(struct file *file, struct kobject *kobj,
@@ -269,7 +269,7 @@ static int int3400_thermal_run_osc(acpi_
return result;
}

-static ssize_t odvp_show(struct kobject *kobj, struct kobj_attribute *attr,
+static ssize_t odvp_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct odvp_attr *odvp_attr;