From nobody Sat Apr 4 01:35:09 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 CB77437E2E5; Sun, 22 Mar 2026 03:19:37 +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=1774149580; cv=none; b=S7UAON1pB+sqMRuyDyqUgF1YQmirsvXfJFWLmnmTyeB5p3NJhd+2VgWglSwYs2JVr1SVkFjyD2oq+ELm7ZCw8kAQ1DpLz7+uFJieNrF5+d7FokoQdmtM2LHe0MFVa0JSG18KFRFx4CVqunPacBJL5jbSZyeJGQwO5uZl545KgEo= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774149580; c=relaxed/simple; bh=CENEbpOf8TbsjkLHwHcCJ8NDO/CCWKi2C26VgiXqKUY=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=h2Z4a7mpLUyQjqaqqWw4DnWoIcajAh/7txwHE2Skr/xYCI5cfdQ0kinNGFP7CdAq8omLfW7qXszp295Y/3ZjPHXmP9Dltyi+/kHybHB5rv/vkayJujVWT0ABHxGt0DHBXmiJklqAhqCltzP/HlPgCGvozLAollDPASorBFEHjms= 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 localhost.localdomain (unknown [111.196.245.197]) by APP-05 (Coremail) with SMTP id zQCowAAXqg26X79pvk8eCw--.20503S2; Sun, 22 Mar 2026 11:19:22 +0800 (CST) From: Pengpeng Hou To: netdev@vger.kernel.org Cc: pengpeng@iscas.ac.cn, "David S . Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , Kees Cook , linux-kernel@vger.kernel.org Subject: [PATCH] net/nfc: bound SENSF response copy length Date: Sun, 22 Mar 2026 11:19:22 +0800 Message-ID: <20260322031922.57949-1-pengpeng@iscas.ac.cn> X-Mailer: git-send-email 2.50.1 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: zQCowAAXqg26X79pvk8eCw--.20503S2 X-Coremail-Antispam: 1UD129KBjvdXoWrZrW7uF47ZFy8XryxCFykXwb_yoWkXFc_Za srAF9rK3Z8WFn7C3yxGrs3G3srX3yxu3WfZ3yagF9xCa45ZF18Ar48trZ8ArnruF40yFWr Cr17Xr1Ikw4UujkaLaAFLSUrUUUUjb8apTn2vfkv8UJUUUU8Yxn0WfASr-VFAUDa7-sFnT 9fnUUIcSsGvfJTRUUUb48FF20E14v26r4j6ryUM7CY07I20VC2zVCF04k26cxKx2IYs7xG 6rWj6s0DM7CIcVAFz4kK6r1j6r18M28lY4IEw2IIxxk0rwA2F7IY1VAKz4vEj48ve4kI8w A2z4x0Y4vE2Ix0cI8IcVAFwI0_Gr0_Xr1l84ACjcxK6xIIjxv20xvEc7CjxVAFwI0_Gr0_ Cr1l84ACjcxK6I8E87Iv67AKxVWxJr0_GcWl84ACjcxK6I8E87Iv6xkF7I0E14v26F4UJV W0owAS0I0E0xvYzxvE52x082IY62kv0487Mc02F40EFcxC0VAKzVAqx4xG6I80ewAv7VC0 I7IYx2IY67AKxVWUJVWUGwAv7VC2z280aVAFwI0_Jr0_Gr1lOx8S6xCaFVCjc4AY6r1j6r 4UM4x0Y48IcxkI7VAKI48JM4x0x7Aq67IIx4CEVc8vx2IErcIFxwCY1x0262kKe7AKxVWU tVW8ZwCF04k20xvY0x0EwIxGrwCFx2IqxVCFs4IE7xkEbVWUJVW8JwC20s026c02F40E14 v26r1j6r18MI8I3I0E7480Y4vE14v26r106r1rMI8E67AF67kF1VAFwI0_Jw0_GFylIxkG c2Ij64vIr41lIxAIcVC0I7IYx2IY67AKxVWUJVWUCwCI42IY6xIIjxv20xvEc7CjxVAFwI 0_Jr0_Gr1lIxAIcVCF04k26cxKx2IYs7xG6r1j6r1xMIIF0xvEx4A2jsIE14v26r1j6r4U MIIF0xvEx4A2jsIEc7CjxVAFwI0_Jr0_GrUvcSsGvfC2KfnxnUUI43ZEXa7VUbGQ6JUUUU U== X-CM-SenderInfo: pshqw1xhqjqxpvfd2hldfou0/ Content-Type: text/plain; charset="utf-8" `digital_in_recv_sensf_res()` only checks `resp->len` against the minimum frame size before copying the response into `target.sensf_res`. The destination is `NFC_SENSF_RES_MAXSIZE` bytes long, so an oversized SENSF response can overwrite adjacent fields in the stack-local `struct nfc_target` before the result is handed to `digital_target_found()`. Reject frames larger than the destination buffer before copying. Signed-off-by: Pengpeng Hou --- net/nfc/digital_technology.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/net/nfc/digital_technology.c b/net/nfc/digital_technology.c index 63f1b721c71d..8147e61c224a 100644 --- a/net/nfc/digital_technology.c +++ b/net/nfc/digital_technology.c @@ -768,6 +768,11 @@ static void digital_in_recv_sensf_res(struct nfc_digit= al_dev *ddev, void *arg, =20 skb_pull(resp, 1); =20 + if (resp->len > NFC_SENSF_RES_MAXSIZE) { + rc =3D -EIO; + goto exit; + } + memset(&target, 0, sizeof(struct nfc_target)); =20 sensf_res =3D (struct digital_sensf_res *)resp->data; --=20 2.50.1 (Apple Git-155)