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authorAxel Lin <axel.lin@gmail.com>2010-07-21 02:19:53 +0400
committerMatthew Garrett <mjg@redhat.com>2010-08-03 17:49:04 +0400
commit7677fbdff16f5b817bc3dc5d194a8b3350f8f9cb (patch)
tree2086eff81fa49d9b9a5ab569a7b867f30c7d24d6 /drivers/platform/x86/acer-wmi.c
parent669048639ca6d3fdfb2e75dd77b8f49434d57625 (diff)
downloadlinux-7677fbdff16f5b817bc3dc5d194a8b3350f8f9cb.tar.xz
acer-wmi: fix memory leaks in wmab_execute error path
When acpi_evaluate_object() is passed ACPI_ALLOCATE_BUFFER, the caller must kfree the returned buffer if AE_OK is returned. Call Trace: wmab_execute -> wmi_evaluate_method -> acpi_evaluate_object Thus if callers of wmab_execute() pass ACPI_ALLOCATE_BUFFER, the return buffer must be kfreed if wmab_execute return AE_OK. [akpm@linux-foundation.org: avoid multiple return points, remove unneeded cast, remove unneeded initialisation of `status'] Signed-off-by: Axel Lin <axel.lin@gmail.com> Acked-by: Carlos Corbacho <carlos@strangeworlds.co.uk> Cc: Matthew Garrett <mjg@redhat.com> Cc: Thomas Renninger <trenn@suse.de> Cc: Alan Jenkins <alan-jenkins@tuffmail.co.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Matthew Garrett <mjg@redhat.com>
Diffstat (limited to 'drivers/platform/x86/acer-wmi.c')
-rw-r--r--drivers/platform/x86/acer-wmi.c24
1 files changed, 16 insertions, 8 deletions
diff --git a/drivers/platform/x86/acer-wmi.c b/drivers/platform/x86/acer-wmi.c
index 652ca1800a0a..b06678660956 100644
--- a/drivers/platform/x86/acer-wmi.c
+++ b/drivers/platform/x86/acer-wmi.c
@@ -555,6 +555,7 @@ static acpi_status AMW0_find_mailled(void)
obj->buffer.length == sizeof(struct wmab_ret)) {
ret = *((struct wmab_ret *) obj->buffer.pointer);
} else {
+ kfree(out.pointer);
return AE_ERROR;
}
@@ -570,7 +571,7 @@ static acpi_status AMW0_set_capabilities(void)
{
struct wmab_args args;
struct wmab_ret ret;
- acpi_status status = AE_OK;
+ acpi_status status;
struct acpi_buffer out = { ACPI_ALLOCATE_BUFFER, NULL };
union acpi_object *obj;
@@ -593,12 +594,13 @@ static acpi_status AMW0_set_capabilities(void)
if (ACPI_FAILURE(status))
return status;
- obj = (union acpi_object *) out.pointer;
+ obj = out.pointer;
if (obj && obj->type == ACPI_TYPE_BUFFER &&
obj->buffer.length == sizeof(struct wmab_ret)) {
ret = *((struct wmab_ret *) obj->buffer.pointer);
} else {
- return AE_ERROR;
+ status = AE_ERROR;
+ goto out;
}
if (ret.eax & 0x1)
@@ -607,23 +609,26 @@ static acpi_status AMW0_set_capabilities(void)
args.ebx = 2 << 8;
args.ebx |= ACER_AMW0_BLUETOOTH_MASK;
+ /*
+ * It's ok to use existing buffer for next wmab_execute call.
+ * But we need to kfree(out.pointer) if next wmab_execute fail.
+ */
status = wmab_execute(&args, &out);
if (ACPI_FAILURE(status))
- return status;
+ goto out;
obj = (union acpi_object *) out.pointer;
if (obj && obj->type == ACPI_TYPE_BUFFER
&& obj->buffer.length == sizeof(struct wmab_ret)) {
ret = *((struct wmab_ret *) obj->buffer.pointer);
} else {
- return AE_ERROR;
+ status = AE_ERROR;
+ goto out;
}
if (ret.eax & 0x1)
interface->capability |= ACER_CAP_BLUETOOTH;
- kfree(out.pointer);
-
/*
* This appears to be safe to enable, since all Wistron based laptops
* appear to use the same EC register for brightness, even if they
@@ -632,7 +637,10 @@ static acpi_status AMW0_set_capabilities(void)
if (quirks->brightness >= 0)
interface->capability |= ACER_CAP_BRIGHTNESS;
- return AE_OK;
+ status = AE_OK;
+out:
+ kfree(out.pointer);
+ return status;
}
static struct wmi_interface AMW0_interface = {