From nobody Fri Sep 25 02:44:10 2026 Received: from cstnet.cn (smtp25.cstnet.cn [159.226.251.25]) (using TLSv1.2 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id CC5054F0526; Thu, 17 Sep 2026 12:33:51 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=159.226.251.25 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789648443; cv=none; b=j72l2GK42h8VQBgfta9/P9Tz5WjJUDZNtAe6V3njVAQ9CldAynR+qJ1vV/gj0XPDrFIgOgrEbwlJ6P6523LY4Q/nE54o3lBAxXnXsPbpBxDJfzrGicJ5RaQzrwWCJavyG14dUwbUYRecq84MWgU6PzijgDMb7Meh5GIXoy1NenU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789648443; c=relaxed/simple; bh=A34bFxgBnWeF4VHl7PGrj4teQuNWgfYQUvkh55i8cJw=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=ER6zeMJx/pmq8vRg7jwoxm1/3qwKQFooLbcGngMVvVQ6Rea5R5wjtkYGuK43fi8PSRPmEXKbjwgyTTcunb7FRcUJzY41NumTACIi3IUZLbL+1GwLcTw72kE045AN4XczlCyA+xZWurd1YSLX2wUMg6xBhuHdOMSaVftZytb5S3I= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=iscas.ac.cn; spf=pass smtp.mailfrom=iscas.ac.cn; arc=none smtp.client-ip=159.226.251.25 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=iscas.ac.cn Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=iscas.ac.cn Received: from dfae2b116770.home.arpa (unknown [36.110.52.2]) by APP-05 (Coremail) with SMTP id zQCowACH7zko3qtqiJeACA--.2774S2; Thu, 17 Sep 2026 20:33:44 +0800 (CST) From: Wentao Liang To: gregkh@linuxfoundation.org Cc: linux-kernel@vger.kernel.org, miquel.raynal@bootlin.com, srini@kernel.org, Wentao Liang , stable@vger.kernel.org Subject: [PATCH] nvmem: core: Fix nvmem use-after-free in nvmem_cell_put() Date: Thu, 17 Sep 2026 12:33:44 +0000 Message-Id: <20260917123344.2151268-1-vulab@iscas.ac.cn> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: zQCowACH7zko3qtqiJeACA--.2774S2 X-Coremail-Antispam: 1UD129KBjvdXoWrZr1DKF18Xr1DZF1rur13twb_yoWDZFb_uw 1j9FsrXF1fJrnrKr1fCF1fZ348tr4SgrZYyF1vqFs5JFWjvr9ru3sY9398Ary3Xr4SvrZr XryDJr4FgrW7CjkaLaAFLSUrUUUUjb8apTn2vfkv8UJUUUU8Yxn0WfASr-VFAUDa7-sFnT 9fnUUIcSsGvfJTRUUUbS8YjsxI4VWDJwAYFVCjjxCrM7CY07I20VC2zVCF04k26cxKx2IY s7xG6rWj6s0DM7CIcVAFz4kK6r1j6r18M28lY4IEw2IIxxk0rwA2F7IY1VAKz4vEj48ve4 kI8wA2z4x0Y4vE2Ix0cI8IcVAFwI0_Gr0_Xr1l84ACjcxK6xIIjxv20xvEc7CjxVAFwI0_ Cr0_Gr1UM28EF7xvwVC2z280aVAFwI0_GcCE3s1l84ACjcxK6I8E87Iv6xkF7I0E14v26r xl6s0DM2AIxVAIcxkEcVAq07x20xvEncxIr21l5I8CrVACY4xI64kE6c02F40Ex7xfMcIj 6xIIjxv20xvE14v26r1q6rW5McIj6I8E87Iv67AKxVW8Jr0_Cr1UMcvjeVCFs4IE7xkEbV WUJVW8JwACjcxG0xvY0x0EwIxGrwACjI8F5VAI37AI020EjII2zVCS5cI20VAGYxC7MxkF 7I0En4kS14v26r126r1DMxAIw28IcxkI7VAKI48JMxAIw28IcVCjz48v1sIEY20_Gr43Wr 1UJr1l4I8I3I0E4IkC6x0Yz7v_Jr0_Gr1lx2IqxVAqx4xG67AKxVWUJVWUGwC20s026x8G jcxK67AKxVWUGVWUWwC2zVAF1VAY17CE14v26r126r1DMIIYrxkI7VAKI48JMIIF0xvE2I x0cI8IcVAFwI0_JFI_Gr1lIxAIcVC0I7IYx2IY6xkF7I0E14v26F4j6r4UJwCI42IY6xAI w20EY4v20xvaj40_Jr0_JF4lIxAIcVC2z280aVAFwI0_Gr1j6F4UJwCI42IY6I8E87Iv6x kF7I0E14v26rxl6s0DYxBIdaVFxhVjvjDU0xZFpf9x07jngAwUUUUU= X-CM-SenderInfo: pyxotu46lvutnvoduhdfq/1tbiBgYNA2qrq3ag0gAAsg Content-Type: text/plain; charset="utf-8" __nvmem_device_put() drops the last reference to the nvmem device, which runs nvmem_device_release() and unregisters and frees the device, but nvmem_layout_module_put() then dereferences nvmem->layout on that freed device. Call nvmem_layout_module_put() before __nvmem_device_put() so the layout is still accessed while the device is alive. Fixes: fc29fd821d9ac ("nvmem: core: Rework layouts to become regular device= s") Cc: stable@vger.kernel.org Signed-off-by: Wentao Liang --- drivers/nvmem/core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c index 311cb2e5a5c0..4df7efde2cd2 100644 --- a/drivers/nvmem/core.c +++ b/drivers/nvmem/core.c @@ -1593,8 +1593,8 @@ void nvmem_cell_put(struct nvmem_cell *cell) kfree_const(cell->id); =20 kfree(cell); - __nvmem_device_put(nvmem); nvmem_layout_module_put(nvmem); + __nvmem_device_put(nvmem); } EXPORT_SYMBOL_GPL(nvmem_cell_put); =20 --=20 2.34.1