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Fri, 11 Jan 2019 23:03:02 +0000 From: Martin Kelly To: "linux-iio@vger.kernel.org" CC: Jonathan Cameron , Martin Kelly , Dan Carpenter Subject: [PATCH] tools: iio: iio_generic_buffer: make num_loops signed Thread-Topic: [PATCH] tools: iio: iio_generic_buffer: make num_loops signed Thread-Index: AQHUqgHNb2YAUuSTzES9dJehFoXdUA== Date: Fri, 11 Jan 2019 23:03:02 +0000 Message-ID: <20190111230224.20410-1-mkelly@xevo.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-clientproxiedby: MWHPR22CA0039.namprd22.prod.outlook.com (2603:10b6:300:69::25) To DM5PR18MB1452.namprd18.prod.outlook.com (2603:10b6:3:bc::17) authentication-results: spf=none (sender IP is ) smtp.mailfrom=mkelly@xevo.com; x-ms-exchange-messagesentrepresentingtype: 1 x-originating-ip: [174.21.177.9] x-ms-publictraffictype: Email x-microsoft-exchange-diagnostics: 1;DM5PR18MB2229;6:as1VCOL95rEqBsAf7Bas9LjSGHCfWdQ9c86On0+V4pPcdmxQcdsSVI0ozL4DdgtnO42nDiweI/2Kbr8Xx3KZQpfeHJSnWBua8zFCg+Z0rGKzPlzqdcEbdtJfmPrnYcRbNU/yRfEU3w/zhaxZt6m7Jm9hTbRiOuMvjDRKps0twsBkpGEDRqKWazQod4m9RXqa1KPwDv0FQlF99Jn2NFwSsH1bH6rMb6WQjJppHIMfjNIMpap1hISehmcMZk5Shx93rc/kp6cp4WT/+zsM6RBaZkEztASEJp76Mm7VN4Wp2/g8iwakzjOln1kHBhVUHAz0U6OO94rbtnHaz0GHmhgOwNsTSEBqafnHNRc9JVwK9Q+7Df1mqDyl1JUqfvhpSK0X8pXs20GzfY6YsFb3TxQjwzekXUGYPKNuO5rgoy55LVy5r/7XhD0VXYkIKZdT2FIyI6OOsH7AAwrpTmVZNfb32w==;5:NndMVLQTiEq2I1vXLL/RfcCbK9K8ODcq3BJU7Xne/4jo7EVBkxTVF4PCMInBYGYIchtbyw2E5aCkiHLubbtz5r84iMFLZlSezKsjvpBuK4VtVkNk6nss2wtXphzuBILWmdek6RDrMaVjbQUFsQCZIMrBVt3drJ1Jw9Xlv+plf1Gr2N5OcwKQh3MBFm7xfr//oQd05+qtLPnXHmGSNLoRWw==;7:clDNk0J+nAV3pm6iCg4qMu65zkXtBbQIy2UH09hUZdJIDiuwsSkhN6H0zyyMclgoE+Fjbv6I7CVbcTqBeixZ+AQLLw8wECIQ/EWwbrbk+Q2HzDFdV+pH7gHKsajNmCe5WDtpDfjzZ/QSK9c7Dg/bgg== x-ms-office365-filtering-correlation-id: 2226f492-9f17-4eb5-7c6c-08d67818efe3 x-microsoft-antispam: BCL:0;PCL:0;RULEID:(2390118)(7020095)(4652040)(8989299)(4534185)(4627221)(201703031133081)(201702281549075)(8990200)(5600109)(711020)(2017052603328)(7153060)(7193020);SRVR:DM5PR18MB2229; 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charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: xevo.com X-MS-Exchange-CrossTenant-Network-Message-Id: 2226f492-9f17-4eb5-7c6c-08d67818efe3 X-MS-Exchange-CrossTenant-originalarrivaltime: 11 Jan 2019 23:03:02.2465 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: e0a7ca1f-2458-4cd6-a7c7-d733c07495ab X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR18MB2229 Sender: linux-iio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org Currently, num_loops is unsigned, but it's set by strtoll, which returns a (signed) long long int. This could lead to overflow, and it also makes the check "num_loops < 0" always be false, since num_loops is unsigned. Setting num_loops to -1 to loop forever is almost working because num_loops is getting set to a very high number, but it's technically still incorrect. Fix this issue by making num_loops signed. This also fixes an error found by Smatch. Signed-off-by: Martin Kelly Reported-by: Dan Carpenter --- tools/iio/iio_generic_buffer.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tools/iio/iio_generic_buffer.c b/tools/iio/iio_generic_buffer.= c index 3040830d7797..84545666a09c 100644 --- a/tools/iio/iio_generic_buffer.c +++ b/tools/iio/iio_generic_buffer.c @@ -330,7 +330,7 @@ static const struct option longopts[] =3D { =20 int main(int argc, char **argv) { - unsigned long long num_loops =3D 2; + long long num_loops =3D 2; unsigned long timedelay =3D 1000000; unsigned long buf_len =3D 128; =20 --=20 2.20.1