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[59.190.207.251]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2b2d4f2af90sm13532835ad.64.2026.04.09.21.59.22 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 09 Apr 2026 21:59:23 -0700 (PDT) From: Berk Cem Goksel To: Takashi Iwai , Jaroslav Kysela Cc: linux-sound@vger.kernel.org, linux-kernel@vger.kernel.org, Andrey Konovalov , Berk Cem Goksel , stable@vger.kernel.org Subject: [PATCH 1/2] ALSA: caiaq: fix use-after-free and double-free in setup_card() Date: Fri, 10 Apr 2026 07:59:03 +0300 Message-Id: <20260410045904.1064020-2-berkcgoksel@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260410045904.1064020-1-berkcgoksel@gmail.com> References: <20260410045904.1064020-1-berkcgoksel@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit When snd_card_register() fails in setup_card(), snd_card_free() is called on the card, but there is no return statement afterwards. Execution falls through to snd_usb_caiaq_control_init(cdev), which dereferences members of the just-freed card, resulting in a use-after-free. setup_card() is void and init_card() still returns 0 on this path, so snd_probe() leaves the freed card pointer in the USB interface's private data via usb_set_intfdata(). When the device is later disconnected, snd_usb_caiaq_disconnect() calls snd_card_free_when_closed() on that same pointer, producing a double-free and slab corruption. Add the missing return so a failed snd_card_register() cleanly aborts setup without touching freed memory. The issue is reachable by any caiaq-compatible USB device whose descriptors cause snd_card_register() to fail. It was reproduced with raw-gadget + dummy_hcd on 7.0.0-rc5 (arm64, KASAN). Fixes: 523f1dce7096 ("ALSA: snd-usb-caiaq: add support for NI Audio Kontrol 1") Cc: stable@vger.kernel.org Cc: Andrey Konovalov Signed-off-by: Berk Cem Goksel --- sound/usb/caiaq/device.c | 1 + 1 file changed, 1 insertion(+) diff --git a/sound/usb/caiaq/device.c b/sound/usb/caiaq/device.c --- a/sound/usb/caiaq/device.c +++ b/sound/usb/caiaq/device.c @@ -369,6 +369,7 @@ if (ret < 0) { dev_err(dev, "snd_card_register() returned %d\n", ret); snd_card_free(cdev->chip.card); + return; } ret = snd_usb_caiaq_control_init(cdev);