From patchwork Tue Jul 2 14:23:34 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bastien Nocera X-Patchwork-Id: 809179 Received: from relay1-d.mail.gandi.net (relay1-d.mail.gandi.net [217.70.183.193]) (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 6E3841B5837 for ; Tue, 2 Jul 2024 14:24:45 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.70.183.193 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1719930287; cv=none; b=tM8DtQaP7OuBqt8BOBImwkdBJY62sRd2K59eTouMIoXr9rz5GtK3KOmlX0HcEDK+9iiG25G0mJCzsxmiEQ16jYQpiaWAWwmd+jKsDE9xUS7DqZaV/uLLuZuQJF7xDhiB7ok9JLCWRBNb8TSsw4QfMYIp7YgCuNub4Tyra7mdrK0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1719930287; c=relaxed/simple; bh=nxQmHvj5d+IOf5OrJz12+hosL98o57kQzrHPM1hlJc8=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=e8fvlffsJ6WhnssNYuLMQV3mpRYHlnwYLlX9OAPcUcj9FeJ3NXfrU6R7u1jYC8iieFfP9GnJQc4hyB34MAE7LQ0+S/tKaGwi8LWm31h/86LO/v4i4y2r+8oJJTyKRRGFsGsb1aEZfPDg8f5Mgk4q0MTNFFN1I9y4cdLekzXFpZk= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=hadess.net; spf=pass smtp.mailfrom=hadess.net; arc=none smtp.client-ip=217.70.183.193 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=hadess.net Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=hadess.net Received: by mail.gandi.net (Postfix) with ESMTPSA id 0C28A24000D; Tue, 2 Jul 2024 14:24:37 +0000 (UTC) From: Bastien Nocera To: linux-bluetooth@vger.kernel.org Cc: Bastien Nocera Subject: [BlueZ resend 2/9] avdtp: Fix manipulating struct as an array Date: Tue, 2 Jul 2024 16:23:34 +0200 Message-ID: <20240702142436.833138-3-hadess@hadess.net> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20240702142436.833138-1-hadess@hadess.net> References: <20240702142436.833138-1-hadess@hadess.net> Precedence: bulk X-Mailing-List: linux-bluetooth@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-GND-Sasl: hadess@hadess.net Don't manipulate the "req" structs as if they were flat arrays, static analysis and humans are both equally confused by this kind of usage. Error: ARRAY_VS_SINGLETON (CWE-119): [#def26] [important] bluez-5.76/profiles/audio/avdtp.c:1675:2: address_of: Taking address with "&start->first_seid" yields a singleton pointer. bluez-5.76/profiles/audio/avdtp.c:1675:2: assign: Assigning: "seid" = "&start->first_seid". bluez-5.76/profiles/audio/avdtp.c:1679:25: ptr_arith: Using "seid" as an array. This might corrupt or misinterpret adjacent memory locations. 1677| int i; 1678| 1679|-> for (i = 0; i < count; i++, seid++) { 1680| if (seid->seid == id) { 1681| req->collided = TRUE; Error: ARRAY_VS_SINGLETON (CWE-119): [#def27] [important] bluez-5.76/profiles/audio/avdtp.c:1690:2: address_of: Taking address with "&suspend->first_seid" yields a singleton pointer. bluez-5.76/profiles/audio/avdtp.c:1690:2: assign: Assigning: "seid" = "&suspend->first_seid". bluez-5.76/profiles/audio/avdtp.c:1694:25: ptr_arith: Using "seid" as an array. This might corrupt or misinterpret adjacent memory locations. 1692| int i; 1693| 1694|-> for (i = 0; i < count; i++, seid++) { 1695| if (seid->seid == id) { 1696| req->collided = TRUE; Error: ARRAY_VS_SINGLETON (CWE-119): [#def28] [important] bluez-5.76/profiles/audio/avdtp.c:1799:2: address_of: Taking address with "&req->first_seid" yields a singleton pointer. bluez-5.76/profiles/audio/avdtp.c:1799:2: assign: Assigning: "seid" = "&req->first_seid". bluez-5.76/profiles/audio/avdtp.c:1801:30: ptr_arith: Using "seid" as an array. This might corrupt or misinterpret adjacent memory locations. 1799| seid = &req->first_seid; 1800| 1801|-> for (i = 0; i < seid_count; i++, seid++) { 1802| failed_seid = seid->seid; 1803| Error: ARRAY_VS_SINGLETON (CWE-119): [#def29] [important] bluez-5.76/profiles/audio/avdtp.c:1912:2: address_of: Taking address with "&req->first_seid" yields a singleton pointer. bluez-5.76/profiles/audio/avdtp.c:1912:2: assign: Assigning: "seid" = "&req->first_seid". bluez-5.76/profiles/audio/avdtp.c:1914:30: ptr_arith: Using "seid" as an array. This might corrupt or misinterpret adjacent memory locations. 1912| seid = &req->first_seid; 1913| 1914|-> for (i = 0; i < seid_count; i++, seid++) { 1915| failed_seid = seid->seid; 1916| --- profiles/audio/avdtp.c | 45 +++++++++++++++++++++--------------------- 1 file changed, 23 insertions(+), 22 deletions(-) diff --git a/profiles/audio/avdtp.c b/profiles/audio/avdtp.c index 3667e08400dd..45d1b120b760 100644 --- a/profiles/audio/avdtp.c +++ b/profiles/audio/avdtp.c @@ -184,13 +184,17 @@ struct getcap_resp { } __attribute__ ((packed)); struct start_req { - struct seid first_seid; - struct seid other_seids[0]; + union { + struct seid required[1]; + struct seid seids[0]; + }; } __attribute__ ((packed)); struct suspend_req { - struct seid first_seid; - struct seid other_seids[0]; + union { + struct seid required[1]; + struct seid seids[0]; + }; } __attribute__ ((packed)); struct seid_rej { @@ -1672,12 +1676,12 @@ static void check_seid_collision(struct pending_req *req, uint8_t id) static void check_start_collision(struct pending_req *req, uint8_t id) { struct start_req *start = req->data; - struct seid *seid = &start->first_seid; int count = 1 + req->data_size - sizeof(struct start_req); int i; - for (i = 0; i < count; i++, seid++) { - if (seid->seid == id) { + for (i = 0; i < count; i++) { + struct seid seid = start->seids[i]; + if (seid.seid == id) { req->collided = TRUE; return; } @@ -1687,12 +1691,12 @@ static void check_start_collision(struct pending_req *req, uint8_t id) static void check_suspend_collision(struct pending_req *req, uint8_t id) { struct suspend_req *suspend = req->data; - struct seid *seid = &suspend->first_seid; int count = 1 + req->data_size - sizeof(struct suspend_req); int i; - for (i = 0; i < count; i++, seid++) { - if (seid->seid == id) { + for (i = 0; i < count; i++) { + struct seid seid = suspend->seids[i]; + if (seid.seid == id) { req->collided = TRUE; return; } @@ -1785,7 +1789,6 @@ static gboolean avdtp_start_cmd(struct avdtp *session, uint8_t transaction, struct avdtp_local_sep *sep; struct avdtp_stream *stream; struct stream_rej rej; - struct seid *seid; uint8_t err, failed_seid; int seid_count, i; @@ -1796,12 +1799,12 @@ static gboolean avdtp_start_cmd(struct avdtp *session, uint8_t transaction, seid_count = 1 + size - sizeof(struct start_req); - seid = &req->first_seid; + for (i = 0; i < seid_count; i++) { + struct seid seid = req->seids[i]; - for (i = 0; i < seid_count; i++, seid++) { - failed_seid = seid->seid; + failed_seid = seid.seid; - sep = find_local_sep_by_seid(session, seid->seid); + sep = find_local_sep_by_seid(session, seid.seid); if (!sep || !sep->stream) { err = AVDTP_BAD_ACP_SEID; goto failed; @@ -1898,7 +1901,6 @@ static gboolean avdtp_suspend_cmd(struct avdtp *session, uint8_t transaction, struct avdtp_local_sep *sep; struct avdtp_stream *stream; struct stream_rej rej; - struct seid *seid; uint8_t err, failed_seid; int seid_count, i; @@ -1909,12 +1911,11 @@ static gboolean avdtp_suspend_cmd(struct avdtp *session, uint8_t transaction, seid_count = 1 + size - sizeof(struct suspend_req); - seid = &req->first_seid; + for (i = 0; i < seid_count; i++) { + struct seid seid = req->seids[i]; + failed_seid = seid.seid; - for (i = 0; i < seid_count; i++, seid++) { - failed_seid = seid->seid; - - sep = find_local_sep_by_seid(session, seid->seid); + sep = find_local_sep_by_seid(session, seid.seid); if (!sep || !sep->stream) { err = AVDTP_BAD_ACP_SEID; goto failed; @@ -3663,7 +3664,7 @@ int avdtp_start(struct avdtp *session, struct avdtp_stream *stream) } memset(&req, 0, sizeof(req)); - req.first_seid.seid = stream->rseid; + req.required->seid = stream->rseid; ret = send_request(session, FALSE, stream, AVDTP_START, &req, sizeof(req));