From patchwork Tue Jul 9 12:00:29 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Roman Smirnov X-Patchwork-Id: 811579 Received: from mx01.omp.ru (mx01.omp.ru [90.154.21.10]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 940A6156F45 for ; Tue, 9 Jul 2024 12:01:20 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.154.21.10 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720526486; cv=none; b=AnqGW61AyDjtm6r4pzhc9A5GEdDVLPo3P9YznrngmWFxSvNehnaK6eTi9jPO2r4FggUQLHTBYq5QaUJ1G7uZ1iSBs+FqeemApLN7C/7LvfprM4ancvbcO4WabSOKoJLQbk7NaObL3tg2OUJevmYDzw+ufxwbbWLhnt6D1cHrzU0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720526486; c=relaxed/simple; bh=0ejBL7ZSc7gA/IcHRXJCCK5EfVVRFcFEnRVWsUP1gqk=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=uY1AqUzaUizV8XpZpS38lokw0Z4JkRMwKPu8R/3uB1W3GohHxcRgmo1xtGgWIZZ9fPzmwfrmEQ6k+QrsPvWFk/YpBb3mWVlB+ALEXg5jiiH5sbO6LYUcD898dX2wuLdRjlwG2sfJftf/rEAO+hVgKRHDyqcS6qjbvE2Z9CDg6A0= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=omp.ru; spf=pass smtp.mailfrom=omp.ru; arc=none smtp.client-ip=90.154.21.10 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=omp.ru Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=omp.ru Received: from inp1wst083.omp.ru (81.22.207.138) by msexch01.omp.ru (10.188.4.12) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384) id 15.2.1258.12; Tue, 9 Jul 2024 15:00:56 +0300 From: Roman Smirnov To: CC: Roman Smirnov Subject: [PATCH BlueZ v1 2/4] shared: prevent dereferencing of NULL pointers Date: Tue, 9 Jul 2024 15:00:29 +0300 Message-ID: <20240709120031.105038-3-r.smirnov@omp.ru> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240709120031.105038-1-r.smirnov@omp.ru> References: <20240709120031.105038-1-r.smirnov@omp.ru> Precedence: bulk X-Mailing-List: linux-bluetooth@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: msexch01.omp.ru (10.188.4.12) To msexch01.omp.ru (10.188.4.12) X-KSE-ServerInfo: msexch01.omp.ru, 9 X-KSE-AntiSpam-Interceptor-Info: scan successful X-KSE-AntiSpam-Version: 6.1.0, Database issued on: 07/09/2024 11:45:20 X-KSE-AntiSpam-Status: KAS_STATUS_NOT_DETECTED X-KSE-AntiSpam-Method: none X-KSE-AntiSpam-Rate: 19 X-KSE-AntiSpam-Info: Lua profiles 186390 [Jul 09 2024] X-KSE-AntiSpam-Info: Version: 6.1.0.4 X-KSE-AntiSpam-Info: Envelope from: r.smirnov@omp.ru X-KSE-AntiSpam-Info: LuaCore: 23 0.3.23 8881c50ebb08f9085352475be251cf18bb0fcfdd X-KSE-AntiSpam-Info: {rep_avail} X-KSE-AntiSpam-Info: {Tracking_from_domain_doesnt_match_to} X-KSE-AntiSpam-Info: {SMTP from is not routable} X-KSE-AntiSpam-Info: {Found in DNSBL: 81.22.207.138 in (user) b.barracudacentral.org} X-KSE-AntiSpam-Info: 81.22.207.138:7.1.2; inp1wst083.omp.ru:7.1.1; 127.0.0.199:7.1.2; omp.ru:7.1.1; d41d8cd98f00b204e9800998ecf8427e.com:7.1.1 X-KSE-AntiSpam-Info: ApMailHostAddress: 81.22.207.138 X-KSE-AntiSpam-Info: {DNS response errors} X-KSE-AntiSpam-Info: Rate: 19 X-KSE-AntiSpam-Info: Status: not_detected X-KSE-AntiSpam-Info: Method: none X-KSE-AntiSpam-Info: Auth:dmarc=temperror header.from=omp.ru;spf=temperror smtp.mailfrom=omp.ru;dkim=none X-KSE-Antiphishing-Info: Clean X-KSE-Antiphishing-ScanningType: Heuristic X-KSE-Antiphishing-Method: None X-KSE-Antiphishing-Bases: 07/09/2024 11:49:00 X-KSE-Antivirus-Interceptor-Info: scan successful X-KSE-Antivirus-Info: Clean, bases: 7/9/2024 11:26:00 AM X-KSE-Attachment-Filter-Triggered-Rules: Clean X-KSE-Attachment-Filter-Triggered-Filters: Clean X-KSE-BulkMessagesFiltering-Scan-Result: InTheLimit It is necessary to add checks for NULL before dereferencing pointers. Found with the SVACE static analysis tool. --- src/shared/micp.c | 4 ++++ src/shared/vcp.c | 12 ++++++++++++ 2 files changed, 16 insertions(+) diff --git a/src/shared/micp.c b/src/shared/micp.c index b82bd92de..1c34e9d00 100644 --- a/src/shared/micp.c +++ b/src/shared/micp.c @@ -398,6 +398,10 @@ static void mics_mute_write(struct gatt_db_attribute *attrib, } micp_op = iov_pull_mem(&iov, sizeof(*micp_op)); + if (!micp_op) { + DBG(micp, "iov_pull_mem() returned NULL"); + goto respond; + } if ((*micp_op == MICS_DISABLED) || (*micp_op != MICS_NOT_MUTED && *micp_op != MICS_MUTED)) { diff --git a/src/shared/vcp.c b/src/shared/vcp.c index 06264a241..602d46dc1 100644 --- a/src/shared/vcp.c +++ b/src/shared/vcp.c @@ -925,6 +925,10 @@ static void vcs_cp_write(struct gatt_db_attribute *attrib, } vcp_op = iov_pull_mem(&iov, sizeof(*vcp_op)); + if (!vcp_op) { + DBG(vcp, "iov_pull_mem() returned NULL"); + goto respond; + } for (handler = vcp_handlers; handler && handler->str; handler++) { if (handler->op != *vcp_op) @@ -985,6 +989,10 @@ static void vocs_cp_write(struct gatt_db_attribute *attrib, } vcp_op = iov_pull_mem(&iov, sizeof(*vcp_op)); + if (!vcp_op) { + DBG(vcp, "iov_pull_mem() returned NULL"); + goto respond; + } for (handler = vocp_handlers; handler && handler->str; handler++) { if (handler->op != *vcp_op) @@ -1517,6 +1525,10 @@ static void aics_ip_cp_write(struct gatt_db_attribute *attrib, } aics_op = iov_pull_mem(&iov, sizeof(*aics_op)); + if (!aics_op) { + DBG(vcp, "iov_pull_mem() returned NULL"); + goto respond; + } for (handler = aics_handlers; handler && handler->str; handler++) { if (handler->op != *aics_op)