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Subject[PATCH] intel_menlow: fix memory leaks in error path
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This patch includes below fixes in error path:
1. fix a memory leak if device_create_file failed in
intel_menlow_add_one_attribute
2. properly free added attributes before return error in
intel_menlow_register_sensor error handler
3. properly call acpi_bus_unregister_driver before return error in
intel_menlow_module_init

Signed-off-by: Axel Lin <axel.lin@gmail.com>
---
drivers/platform/x86/intel_menlow.c | 33 ++++++++++++++++++++++-----------
1 files changed, 22 insertions(+), 11 deletions(-)
diff --git a/drivers/platform/x86/intel_menlow.c b/drivers/platform/x86/intel_menlow.c
index 2f795ce..eacd5da 100644
--- a/drivers/platform/x86/intel_menlow.c
+++ b/drivers/platform/x86/intel_menlow.c
@@ -53,6 +53,8 @@ MODULE_LICENSE("GPL");
#define MEMORY_ARG_CUR_BANDWIDTH 1
#define MEMORY_ARG_MAX_BANDWIDTH 0

+static void intel_menlow_unregister_sensor(void);
+
/*
* GTHS returning 'n' would mean that [0,n-1] states are supported
* In that case max_cstate would be n-1
@@ -406,8 +408,10 @@ static int intel_menlow_add_one_attribute(char *name, int mode, void *show,
attr->handle = handle;

result = device_create_file(dev, &attr->attr);
- if (result)
+ if (result) {
+ kfree(attr);
return result;
+ }

mutex_lock(&intel_menlow_attr_lock);
list_add_tail(&attr->node, &intel_menlow_attr_list);
@@ -431,11 +435,11 @@ static acpi_status intel_menlow_register_sensor(acpi_handle handle, u32 lvl,
/* _TZ must have the AUX0/1 methods */
status = acpi_get_handle(handle, GET_AUX0, &dummy);
if (ACPI_FAILURE(status))
- goto not_found;
+ return (status == AE_NOT_FOUND) ? AE_OK : status;

status = acpi_get_handle(handle, SET_AUX0, &dummy);
if (ACPI_FAILURE(status))
- goto not_found;
+ return (status == AE_NOT_FOUND) ? AE_OK : status;

result = intel_menlow_add_one_attribute("aux0", 0644,
aux0_show, aux0_store,
@@ -445,17 +449,19 @@ static acpi_status intel_menlow_register_sensor(acpi_handle handle, u32 lvl,

status = acpi_get_handle(handle, GET_AUX1, &dummy);
if (ACPI_FAILURE(status))
- goto not_found;
+ goto aux1_not_found;

status = acpi_get_handle(handle, SET_AUX1, &dummy);
if (ACPI_FAILURE(status))
- goto not_found;
+ goto aux1_not_found;

result = intel_menlow_add_one_attribute("aux1", 0644,
aux1_show, aux1_store,
&thermal->device, handle);
- if (result)
+ if (result) {
+ intel_menlow_unregister_sensor();
return AE_ERROR;
+ }

/*
* create the "dabney_enabled" attribute which means the user app
@@ -465,14 +471,17 @@ static acpi_status intel_menlow_register_sensor(acpi_handle handle, u32 lvl,
result = intel_menlow_add_one_attribute("bios_enabled", 0444,
bios_enabled_show, NULL,
&thermal->device, handle);
- if (result)
+ if (result) {
+ intel_menlow_unregister_sensor();
return AE_ERROR;
+ }

- not_found:
+ aux1_not_found:
if (status == AE_NOT_FOUND)
return AE_OK;
- else
- return status;
+
+ intel_menlow_unregister_sensor();
+ return status;
}

static void intel_menlow_unregister_sensor(void)
@@ -513,8 +522,10 @@ static int __init intel_menlow_module_init(void)
status = acpi_walk_namespace(ACPI_TYPE_THERMAL, ACPI_ROOT_OBJECT,
ACPI_UINT32_MAX,
intel_menlow_register_sensor, NULL, NULL, NULL);
- if (ACPI_FAILURE(status))
+ if (ACPI_FAILURE(status)) {
+ acpi_bus_unregister_driver(&intel_menlow_memory_driver);
return -ENODEV;
+ }

return 0;
}
--
1.5.4.3




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