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Tue, 25 Nov 2025 10:19:22 -0800 (PST) Received: from [192.168.1.12] ([41.34.101.194]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-42cb7fd8c47sm37081312f8f.38.2025.11.25.10.19.20 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 25 Nov 2025 10:19:21 -0800 (PST) Message-ID: Date: Tue, 25 Nov 2025 20:19:19 +0200 Precedence: bulk X-Mailing-List: linux-input@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3] HID: memory leak in dualshock4_get_calibration_data To: Max Staudt , Jiri Slaby , roderick.colenbrander@sony.com, jikos@kernel.org, bentiss@kernel.org Cc: linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, syzbot+4f5f81e1456a1f645bf8@syzkaller.appspotmail.com, stable@vger.kernel.org References: <20251122173712.76397-1-eslam.medhat1993@gmail.com> <6251f6df-d4ac-4681-8e8b-6df2514e655b@kernel.org> <44eb6401-e021-4c69-96af-0554f4f31e57@enpas.org> Content-Language: en-US From: Eslam Khafagy In-Reply-To: <44eb6401-e021-4c69-96af-0554f4f31e57@enpas.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit On 11/24/25 16:06, Max Staudt wrote: > On 11/24/25 3:32 PM, Jiri Slaby wrote: >> Isn't this fixed already by: >> commit 8513c154f8ad7097653dd9bf43d6155e5aad4ab3 >> Author: Abdun Nihaal >> Date:   Mon Nov 10 22:45:50 2025 +0530 >> >>      HID: playstation: Fix memory leak in >> dualshock4_get_calibration_data() >> ? > > As far as I can see, that patch does indeed fix the same issue, and it > is already upstream. > > Thanks for the hint - Abdun's patch has been upstreamed quite > recently, hence I guess Eslam missed it by accident. But maybe I'm > wrong and Eslam can chime in himself? Thank's Max & Jiri, sorry i was sick the past couple of days i missed your replies. yes. that patch fixes it. I guess i missed it because it wasn't merged yet when i submitted v1. So please ignore this patch. > > >> Anyway, this is a typical use-case for __free(). Why not to use that? > > Wow, there's been a lot of interesting stuff happening around > cleanup.h. I've been out of the kernel for too long, this looks like > fun. Thanks for pointing it out :) > > > Max Lastly, One question to max, at the beginning of the function  dualshock4_get_calibration_data buf = kzalloc(DS4_FEATURE_REPORT_CALIBRATION_SIZE, GFP_KERNEL); if (!buf) { ret = -ENOMEM; goto transfer_failed; } if the allocation fails. can't we just return here . or do we need to go the the end of the function and do sanity checks at the end?