Hi Dan,
Sorry for I am late to reply you!
於 一，2013-01-07 於 14:32 +0300，Dan Carpenter 提到：
> Hello Lee, Chun-Yi,
>
> The patch 727651bf738b: "acer-wmi: fix obj is NULL but dereferenced"
> from Dec 14, 2012, leads to the following warning:
> drivers/platform/x86/acer-wmi.c:1227 WMID_set_capabilities()
> warn: calling kfree() when 'out.pointer' is always NULL.
>
> 1217 obj = (union acpi_object *) out.pointer;
> 1218 if (obj) {
> 1219 if (obj->type == ACPI_TYPE_BUFFER &&
> 1220 (obj->buffer.length == sizeof(u32) ||
> 1221 obj->buffer.length == sizeof(u64))) {
> 1222 devices = *((u32 *) obj->buffer.pointer);
> 1223 } else if (obj->type == ACPI_TYPE_INTEGER) {
> 1224 devices = (u32) obj->integer.value;
> 1225 }
> 1226 } else {
> 1227 kfree(out.pointer);
> 1228 return AE_ERROR;
> 1229 }
>
> I was going to remove the kfree() but looking the patch which introduced
> it causes GCC warnings and so there is some other stuff which needs to
> be fixed as well.
>
> regards,
> dan carpenter
>
>
The warning will be fixed by Zhang Rui or Paul Bolle's patch:
http://www.mail-archive.com/[email protected]/msg04016.html
http://lkml.org/lkml/2013/1/24/215
With the above patch, kfree() will called when:
+ obj is not NULL but the type is not BUFFER or INTEGER
or
+ obj is NULL. The kfree() check obj is NULL then direct return.
Still appreciate for your review and suggestion!
Thanks a lot!
Joey Lee
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