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Sat, 05 Sep 2026 01:53:17 -0700 (PDT) From: Jeffin Philip To: oneukum@suse.com Cc: jeffinphilip14@gmail.com, linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, syzbot+0b8bff5929865345b29e@syzkaller.appspotmail.com, syzkaller-bugs@googlegroups.com Subject: Re: [syzbot] [usb?] [input?] KASAN: slab-use-after-free Read in k90_record_led_work Date: Sat, 5 Sep 2026 14:22:46 +0530 Message-ID: <20260905085246.11121-1-jeffinphilip14@gmail.com> X-Mailer: git-send-email 2.55.0 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-input@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit On Wed, 2 Sep 2026 14:09:35 +0200, Oliver Neukum wrote: >On 31.08.26 07:46, Jeffin Philip wrote: > >> I believe there is a patch for this already[1], but it has not been merged >> yet. Was written just as the merge window for v7.3 opened, so might have >> been the reason for not being merged. >> >> [1]: https://lore.kernel.org/all/20260817072831.139954-1-ccc194101@163.com/ > >Looking at this patch the following sequence seems possible: > >CPU A CPU B > >enter k90_brightness_set() > >if (led->removed) [FALSE] > Enter k90_cleanup_backlight() > drvdata->backlight->removed = true; [TOO LATE] > cancel_work_sync(&drvdata->backlight->work); [NOP] >schedule_work(&led->work); [THIS IS BAD] > >Just cancelling the work is not enough. Hmm, we are in cleanup path, so wouldn't it be more sensible to use disable_work_sync rather than cancel_work_sync to prevent this kind of issue? Thanks, Jeffin.