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Wed, 26 Aug 2026 22:30:17 -0700 (PDT) From: Jeffin Philip To: gregkh@linuxfoundation.org Cc: dwlsalmeida@gmail.com, jeffinphilip14@gmail.com, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, mchehab@kernel.org, stable@vger.kernel.org, syzbot+c7fc4794e59786f5b4dc@syzkaller.appspotmail.com Subject: Re: [RFC PATCH] media: vidtv: fix uaf in vidtv_bridge_on_new_pkts_avail Date: Thu, 27 Aug 2026 11:00:03 +0530 Message-ID: <20260827053004.14261-1-jeffinphilip14@gmail.com> X-Mailer: git-send-email 2.55.0 In-Reply-To: <2026082710-curse-hardwired-baaa@gregkh> References: <2026082710-curse-hardwired-baaa@gregkh> Precedence: bulk X-Mailing-List: linux-media@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit On Thu, 27 Aug 2026 07:20:31 +0200, Greg KH wrote: >On Thu, Aug 27, 2026 at 10:45:08AM +0530, Jeffin Philip wrote: >> On Thu, 27 Aug 2026 06:51:21 +0200, Greg KH wrote: >> >> >While "fun", this is not a normal path that users ever will hit. See >> >this thread where I propose tainting the kernel if you attempt to do >> >this: >> > https://lore.kernel.org/r/20260826-bind_taint-v1-0-52b05f4a965c@linuxfoundation.org >> >> Thanks for the reference. The task hang is not possible >> then. However, the UAF will be triggered anyway as we are just simulating >> an unbind. Even if the driver's .release is called naturally, if we are >> streaming data, it could cause the UAF, no? > >I'm not saying your patch is incorrect, just that using bind/unbind in a >way to justify code changes isn't ok on it's own (we are seeing some >crazy platform and pci driver patches being proposed because of this...) > >It's up to the maintainers here, just wanted to point out that this is >NOT a normal codepath that users can ever exercise and think it's not >going to possibly cause problem. Understood. Thanks for the review. Thanks, Jeffin.