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Sun, 14 Jun 2026 18:34:04 -0700 (PDT) Received: from localhost.localdomain ([2601:985:4601:5df0:2106:6ce9:6b1:8f70]) by smtp.gmail.com with ESMTPSA id d75a77b69052e-517fb61eaf4sm90857191cf.4.2026.06.14.18.34.03 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Sun, 14 Jun 2026 18:34:04 -0700 (PDT) From: Shuangpeng Bai To: mchehab@kernel.org, linux-media@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [BUG] KASAN: slab-use-after-free in snd_usbtv_pcm_close Date: Sun, 14 Jun 2026 21:34:02 -0400 Message-ID: <178144969601.60470.4852887710381872458@gmail.com> X-Mailer: git-send-email 2.47.1 Precedence: bulk X-Mailing-List: linux-media@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Hi Kernel Maintainers, I hit the following report while testing current upstream kernel: KASAN: slab-use-after-free in snd_usbtv_pcm_close I reproduced this on commit: e8c2f9fdadee7cbc75134dc463c1e0d856d6e5c7 (May 25 2026) The reproducer and .config files are here. https://gist.github.com/shuangpengbai/d75fcb55c539aa707f95debbbc541511 I'm happy to test debug patches or provide additional information. Reported-by: Shuangpeng Bai [ 143.650776][ T8284] ================================================================== [ 143.653135][ T8284] BUG: KASAN: slab-use-after-free in snd_usbtv_pcm_close (include/linux/instrumented.h:82 include/linux/atomic/atomic-instrumented.h:32 drivers/media/usb/usbtv/usbtv-audio.c:80) [ 143.655348][ T8284] Read of size 4 at addr ffff88816f8b0858 by task repro_usbtv_als/8284 [ 143.658360][ T8284] Hardware name: QEMU Ubuntu 24.04 PC v2 (i440FX + PIIX, arch_caps fix, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 143.658373][ T8284] Call Trace: [ 143.658401][ T8284] [ 143.658412][ T8284] dump_stack_lvl (lib/dump_stack.c:94 lib/dump_stack.c:120) [ 143.658466][ T8284] print_report (mm/kasan/report.c:378 mm/kasan/report.c:482) [ 143.658590][ T8284] kasan_report (mm/kasan/report.c:595) [ 143.658627][ T8284] kasan_check_range (mm/kasan/generic.c:? mm/kasan/generic.c:200) [ 143.658645][ T8284] snd_usbtv_pcm_close (include/linux/instrumented.h:82 include/linux/atomic/atomic-instrumented.h:32 drivers/media/usb/usbtv/usbtv-audio.c:80) [ 143.658661][ T8284] snd_pcm_release_substream (sound/core/pcm_native.c:2777) [ 143.658708][ T8284] snd_pcm_release (sound/core/pcm_native.c:2965) [ 143.658720][ T8284] __fput (fs/file_table.c:510) [ 143.658744][ T8284] fput_close_sync (fs/file_table.c:615) [ 143.658797][ T8284] __x64_sys_close (fs/open.c:1507 fs/open.c:1492 fs/open.c:1492) [ 143.658817][ T8284] do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94) [ 143.658841][ T8284] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121) [ 143.658929][ T8284] [ 143.675971][ T8284] Freed by task 10 on cpu 0 at 142.640459s: [ 143.676382][ T8284] kasan_save_track (mm/kasan/common.c:57 mm/kasan/common.c:78) [ 143.676713][ T8284] kasan_save_free_info (mm/kasan/generic.c:584) [ 143.677057][ T8284] __kasan_slab_free (mm/kasan/common.c:253 mm/kasan/common.c:285) [ 143.677388][ T8284] kfree (include/linux/kasan.h:235 mm/slub.c:2689 mm/slub.c:6251 mm/slub.c:6566) [ 143.677659][ T8284] v4l2_device_put (drivers/media/v4l2-core/v4l2-device.c:51 include/linux/kref.h:65 drivers/media/v4l2-core/v4l2-device.c:56) [ 143.677981][ T8284] usb_unbind_interface (drivers/usb/core/driver.c:458) [ 143.678538][ T8284] device_release_driver_internal (drivers/base/dd.c:621 drivers/base/dd.c:1352 drivers/base/dd.c:1375) [ 143.678995][ T8284] bus_remove_device (drivers/base/bus.c:657) [ 143.679349][ T8284] device_del (drivers/base/core.c:3895) [ 143.679650][ T8284] usb_disable_device (drivers/usb/core/message.c:1478) [ 143.680005][ T8284] usb_disconnect (drivers/usb/core/hub.c:2315) [ 143.680340][ T8284] hub_event (drivers/usb/core/hub.c:5407 drivers/usb/core/hub.c:5707 drivers/usb/core/hub.c:5871 drivers/usb/core/hub.c:5953) Best, Shuangpeng