From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-qt1-f170.google.com (mail-qt1-f170.google.com [209.85.160.170]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 859C62E65D for ; Mon, 15 Jun 2026 01:34:05 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.160.170 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781487246; cv=none; b=tNqHGhMmm7XafT4LZ5S0UOGI9Bpy+AhuVKhpKqFx4rJhjiSyA7ghBGLX9kk+D51Qif7qupT5o4iIa3Vf+asMYcsdJwL1JoXF3m0p73SuTmY6M/IeZoFSpGox5Lv6RENPKepv6AyjVqbKXsZnqbaCFV95/CEGfDRfHm4dkS1u3So= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781487246; c=relaxed/simple; bh=7oKXseGbTKhWClIn+IZFKhPmEVFAxBlA+YTrHY4Ksy8=; h=From:To:Subject:Date:Message-ID:MIME-Version:Content-Type; b=BdD/SJH8qQocQYzivia16bA5HZ6UWrnkamWsJYcpJrBalb9PVN74RcCMtwAkdEI+9viOZCQxCeOE37netmppBAC2wBiEPfaVVy+BZ/rumjpwWy1abUFYfY/OumxvV9V5qmzE2VC0dGHSOJn7zNWS6Jx1QjdaVzszmQq0xs7u9pc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=B3V1WLZm; arc=none smtp.client-ip=209.85.160.170 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="B3V1WLZm" Received: by mail-qt1-f170.google.com with SMTP id d75a77b69052e-51788280e71so33091161cf.0 for ; Sun, 14 Jun 2026 18:34:05 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1781487244; x=1782092044; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:message-id:date:subject:to :from:from:to:cc:subject:date:message-id:reply-to; bh=sEIYisvbqosdHIH3SQb5ZKXZqum9xA6gu1xzPhc+QVU=; b=B3V1WLZmNwGkrDA+6D4olUxm/VDF24E2PVu2gUzgwiW4lRHGmYvYJslKYBjZ9Juyp6 obzTYbbTiyyqNHHoZr8yM9vOwfBYFtZ76YMNeSM8VqObr0qegzT/Yr2MenD66cu1Nz5E IQu9om2V8veFpK0md8TpvLfVZXApK31sn+Quj+SFZqxU2aONJJpYI/LLfN90Gid7GgKt iIJjPTd/CHGPwDsLQW6etCGJ3+3FPLsGyCfPMEXRUmkDHW0xVUF9GyOp7knSHAh3msyn GMKRiiWq14mn4YS9x1qiwST7liGBdQKT/sEKF7iminyu8kFTYl5d3UAc3iuPImOxiPgt CvIw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1781487244; x=1782092044; h=content-transfer-encoding:mime-version:message-id:date:subject:to :from:x-gm-gg:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=sEIYisvbqosdHIH3SQb5ZKXZqum9xA6gu1xzPhc+QVU=; b=VzkWQm4FplB3IdbnJh2NWIoNBWBd9ttXAXcAON7TgM/ZIpoNpCbfAaBhPXKNXolWzq BkSMzGZF5uhU1Zem3xtbZ/T1G+jPcfwmr7LkN26Ugc1kd/IcE0BlSQZR/YmqP/ysarmW co6NgQO/85+cq14BMFVjulRYMJAyYPQz71NKBQAxK2W8FPEarWmmWzzF9rfW/2ZlkVp9 mddApub73xF3669fZ3kvPNwTvltog7N6hFxfLscdBglwJ1axSId21dkl5IgygC8/tTDD b70/RuLbFuoM44O45rAk4qwjSPX6pwuyeIeI/t0AV4S7qpEqGV4gLkljUO5PKOxDXPGt BH9g== X-Forwarded-Encrypted: i=1; AFNElJ/sdoD9zjo1AT+RXlv0kzVvDw68XNvgv9Gfa0NJZsV7A2TV6WtRQCDowT+YHSzC5+uy/DwGJgBsn/fv60s=@vger.kernel.org X-Gm-Message-State: AOJu0Ywl0Drpn5bwqGIDdigVCIQMARLuLaT7G3vanvVs7qGUy3dteWV3 cJ42tIsYNvdRl/G1FV8dbx1bvAkVYf7nlbuDrK3FK7yIM/DR91wZwyGPX8+/1Q7izjcl3Q== X-Gm-Gg: Acq92OFPAe6xGqkwD6kWEcCQG6u3Wj+3s1w5u57/qpVvlbfnKqYJXR5UBbzhibKYMik xk4xIM9tBL7omYXit8oQzQQIteqBzIb8UNvW7AZL2Yo31tWH9H5SQtZbdsPvYr27BO/z26Aavo6 DGdEZl+GGwKwdgZtpA8SpoD6i0prDlOqhGzyZhnbaGlir676bOtZj652yFKY9s70O9N7/QKAcTf 3vZH03nwh4Px6vZrAOJVdBykU+xmqQ/z5vL5vuklpforMkkAFqOBwdho+Y65fkCch88E5ZnOfGW ToCtC7+PTEB3lrEYq2FBKvvAm/sNAuLYqoJbDooWbbBdcVbTQgVThZ8ia9NDQ2fkyl4GSn/R1Qy TCD7MnPzVCNrDkuWis5cLdrLMbIacSTfFGOiB42t/jJthoimexrK94xOf1di0GgK8wy5V1bqSjq LMnBJpZxNdm3sI6VtAf0CylaiYq7vspj2YlYq/9NrwL7V48xaHE3ThtsBFUkKyazxDlxMDx3wY9 ivs/nRB X-Received: by 2002:a05:622a:11c5:b0:517:906b:c043 with SMTP id d75a77b69052e-517fe4dd86dmr179688111cf.36.1781487244572; 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-kernel@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