From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D4CFD481AA6; Tue, 25 Aug 2026 13:56:22 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787666184; cv=none; b=t8r8hFLRgz+cLrECFDGLtRPYRn3wcrI7KAaaEpvc8T0P86wSeK1TGRNPmnNiImB+pEmxNnRql4kIoc4dt01MoqmKYhaNEhvZfWeDlKGaBqj/IdT0BFZoN/J+Z+iCLVG98+vQt8xedK2/JGEn90x3Dx9zvT9DJekV1yY8TtD7tgk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787666184; c=relaxed/simple; bh=GJdZ4oUpiYVjgbdkEi+a07i5/hO+O4KepCg0sKoDQfY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=U0MtS8wKtO2rInbq7KDsFPF6o1NLY0ab+v6Rc8IJtQKCpmodrB/TRq8nEPl3gnmRJK9oP5fUb1v9G/sNDcMThV5iO6crhCP2eptI/ENnWE53lLZUu34jcP3Dal0f1psjJ0wlmYCHS/lPFyxvdmBnHaj3CMA0o1H6YzbQr3YqYmI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=s+4fQrto; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="s+4fQrto" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 338021F000E9; Tue, 25 Aug 2026 13:56:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1787666182; bh=+QyOh34iRszkfvF/cVrNI8BrEt7mQhsjMVt2F0o6+7E=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=s+4fQrtoJx6CP/qjTSYNuuNoQc0yQXPCeJjqoD+TEOucUd9Siaijts7Yo6JGdMbyZ Qah1bEcWv1H0Zl97cWhcEDrQratDwJ0yP0byrynpRFu6L/7KPahynIwdN+FUJ8n87I fJRS4M6xUI3lvKG/hkceF8BzNbIQwFqRjn8VDpNU= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Pengpeng Hou , David Heidelberg Subject: [PATCH 5.15 31/76] nfc: microread: validate target discovery payload lengths Date: Tue, 25 Aug 2026 15:26:24 +0200 Message-ID: <20260825132542.780386680@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260825132541.568214149@linuxfoundation.org> References: <20260825132541.568214149@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Pengpeng Hou commit 25519469972ef57c3edb1805dabd6c5612b90211 upstream. microread_target_discovered() parses target discovery payloads from skb->data according to the HCI gate. The fixed field offsets and UID copies were checked only against the destination nfc_target buffers, not against the actual skb length. Validate that each gate-specific payload contains the fixed fields and UID bytes before reading or copying them. Fixes: cfad1ba87150 ("NFC: Initial support for Inside Secure microread") Cc: stable@vger.kernel.org Signed-off-by: Pengpeng Hou Link: https://patch.msgid.link/20260723103508.1-microread-v2-pengpeng@iscas.ac.cn Signed-off-by: David Heidelberg Signed-off-by: Greg Kroah-Hartman --- drivers/nfc/microread/microread.c | 31 +++++++++++++++++++++++++++++-- 1 file changed, 29 insertions(+), 2 deletions(-) --- a/drivers/nfc/microread/microread.c +++ b/drivers/nfc/microread/microread.c @@ -483,13 +483,19 @@ static void microread_target_discovered( switch (gate) { case MICROREAD_GATE_ID_MREAD_ISO_A: + if (skb->len <= MICROREAD_EMCF_A_LEN) { + r = -EINVAL; + goto exit_free; + } + targets->supported_protocols = nfc_hci_sak_to_protocol(skb->data[MICROREAD_EMCF_A_SAK]); targets->sens_res = be16_to_cpu(*(u16 *)&skb->data[MICROREAD_EMCF_A_ATQA]); targets->sel_res = skb->data[MICROREAD_EMCF_A_SAK]; targets->nfcid1_len = skb->data[MICROREAD_EMCF_A_LEN]; - if (targets->nfcid1_len > sizeof(targets->nfcid1)) { + if (targets->nfcid1_len > sizeof(targets->nfcid1) || + targets->nfcid1_len > skb->len - MICROREAD_EMCF_A_UID) { r = -EINVAL; goto exit_free; } @@ -497,13 +503,19 @@ static void microread_target_discovered( targets->nfcid1_len); break; case MICROREAD_GATE_ID_MREAD_ISO_A_3: + if (skb->len <= MICROREAD_EMCF_A3_LEN) { + r = -EINVAL; + goto exit_free; + } + targets->supported_protocols = nfc_hci_sak_to_protocol(skb->data[MICROREAD_EMCF_A3_SAK]); targets->sens_res = be16_to_cpu(*(u16 *)&skb->data[MICROREAD_EMCF_A3_ATQA]); targets->sel_res = skb->data[MICROREAD_EMCF_A3_SAK]; targets->nfcid1_len = skb->data[MICROREAD_EMCF_A3_LEN]; - if (targets->nfcid1_len > sizeof(targets->nfcid1)) { + if (targets->nfcid1_len > sizeof(targets->nfcid1) || + targets->nfcid1_len > skb->len - MICROREAD_EMCF_A3_UID) { r = -EINVAL; goto exit_free; } @@ -511,11 +523,21 @@ static void microread_target_discovered( targets->nfcid1_len); break; case MICROREAD_GATE_ID_MREAD_ISO_B: + if (skb->len < MICROREAD_EMCF_B_UID + 4) { + r = -EINVAL; + goto exit_free; + } + targets->supported_protocols = NFC_PROTO_ISO14443_B_MASK; memcpy(targets->nfcid1, &skb->data[MICROREAD_EMCF_B_UID], 4); targets->nfcid1_len = 4; break; case MICROREAD_GATE_ID_MREAD_NFC_T1: + if (skb->len < MICROREAD_EMCF_T1_UID + 4) { + r = -EINVAL; + goto exit_free; + } + targets->supported_protocols = NFC_PROTO_JEWEL_MASK; targets->sens_res = le16_to_cpu(*(u16 *)&skb->data[MICROREAD_EMCF_T1_ATQA]); @@ -523,6 +545,11 @@ static void microread_target_discovered( targets->nfcid1_len = 4; break; case MICROREAD_GATE_ID_MREAD_NFC_T3: + if (skb->len < MICROREAD_EMCF_T3_UID + 8) { + r = -EINVAL; + goto exit_free; + } + targets->supported_protocols = NFC_PROTO_FELICA_MASK; memcpy(targets->nfcid1, &skb->data[MICROREAD_EMCF_T3_UID], 8); targets->nfcid1_len = 8;