Re: [PATCH] platform/x86: alienware-wmi: fix kfree on potentially uninitialized pointer

[Colin Ian King]

On 03/04/2019 23:02, Darren Hart wrote:
> On Sat, Mar 30, 2019 at 12:17:12AM +0000, Colin King wrote:
>> From: Colin Ian King <colin.king@xxxxxxxxxxxxx>
>>
>> Currently the kfree of output.pointer can be potentially freeing
>> an uninitalized pointer in the case where out_data is NULL. Fix this
>> by reworking the case where out_data is not-null to perform the
>> ACPI status check and also the kfree of outpoint.pointer in one block
>> and hence ensuring the pointer is only freed when it has been used.
>>
>> Also replace the if (ptr != NULL) idiom with just if (ptr).
>>
>> Fixes: ff0e9f26288d ("platform/x86: alienware-wmi: Correct a memory leak")
>> Signed-off-by: Colin Ian King <colin.king@xxxxxxxxxxxxx>
> 
> Thanks for the catch Colin, queued for testing.
> 
> Did you trigger this error or detect it via review or static analysis?
> 
Static analysis, I'm now running a licensed version of Coverity on one
of our servers.

Colin