linux-kernel - Re: HID: bpf: One function call less in call_hid_bpf_rdesc

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Date: Wed, 27 Dec 2023 09:19:27 +0100
From: Markus Elfring <Markus.Elfring@....de>
To: Hou Tao <houtao@...weicloud.com>, bpf@...r.kernel.org,
 linux-input@...r.kernel.org, kernel-janitors@...r.kernel.org,
 Alexei Starovoitov <ast@...nel.org>,
 Benjamin Tissoires <benjamin.tissoires@...hat.com>,
 David Vernet <void@...ifault.com>, Jiri Kosina <jikos@...nel.org>
Cc: LKML <linux-kernel@...r.kernel.org>, cocci@...ia.fr
Subject: Re: HID: bpf: One function call less in call_hid_bpf_rdesc_fixup()
 after error detection

>> The kfree() function was called in one case by the
>> call_hid_bpf_rdesc_fixup() function during error handling
>> even if the passed data structure member contained a null pointer.
>> This issue was detected by using the Coccinelle software.
>
> It is totally OK to free a null pointer through kfree() and the ENOMEM
> case is an unlikely case, so I don't think the patch is necessary.

Would you ever like to avoid redundant data processing a bit more?

Regards,
Markus