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Fri, 11 Jan 2019 23:13:09 +0000 From: Martin Kelly To: "linux-iio@vger.kernel.org" CC: Jonathan Cameron , Martin Kelly , Dan Carpenter Subject: [PATCH v2] tools: iio: iio_generic_buffer: make num_loops signed Thread-Topic: [PATCH v2] tools: iio: iio_generic_buffer: make num_loops signed Thread-Index: AQHUqgM3d3tbG7RCl0CXPXChaor2fw== Date: Fri, 11 Jan 2019 23:13:09 +0000 Message-ID: <20190111231236.21048-1-mkelly@xevo.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-clientproxiedby: MWHPR19CA0023.namprd19.prod.outlook.com (2603:10b6:300:d4::33) 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;DM5PR18MB2278;6:tudRiwD4rpKW4x6HVoljUJ9sv0Asgn/m3W9tHidc2DLZdf2kJ5jt54tnIQAbsjM9AXdefQF9ApC3nXflg2akoCvQn8/7MfmWxNx8gTi2O02V4Hjj+8Huvj6nEWFvea/jEbmgs49MDg7lw1OkMsyzWUarP/P/BYD3fQKUFtO+p/UWnve2dn2O0ikULkfl4lI+sy4qJ2JvYXSYtr/+tpvPdUNRXiXP3pCN52r9GQFGM88QjutUq7hizxGYBWBr/wZx9PQqLn7zDDYA29rnnE+2CHka5nF21MRT1voiVtLNDAZhHfYLOgv5FNaxaSmzTK38urr4AEnlRnWMSKevr4iNv8YUEeDQF/Ziwv7ByixMlywSuK8Ep+JxFzWgm0clURLG/H6T0Bug3uyAkYIdGR56q9fa/vFUeKbXgHrgdIaBqeVktGcwh3kZfwKl2Tco3fqX1u2Rifa4nDt3l56us9iUbw==;5:UTb39Ks+FzVFjHfwdxaNTMyFYaJRdnxGxcEAPkueLjytOhAv7BvFrWga1RAnRESNxjGh2GLna6RXSiF45BDLh/VUX2GeLqCVFP7x0MXXlg1+6XqFcBmkTgAwevvMuhcCr9o0trgA7jv0Mme5ggsGf08ee+a86ZcDHV5k6gDisAnxo2AM3ioNhCjDqruFG5BwX+fMIoDjQzTZ/FRShYvBxw==;7:o67WBmVYSVrPcJjBPSfawt2LyKwOg21miPUIbU5tTF1Ua0IPriU9L3oNnm8mGcComzDdH4EDFROXsLMwCA+HPrDYy5s/x8XJJjii+U4vPTmGfKd73Bx8QZXRa/YAGYKGLQ5vV2w3jebH3e5Ad5Rjjg== x-ms-office365-filtering-correlation-id: 793f6c8e-dc3a-4011-328b-08d6781a59a9 x-microsoft-antispam: BCL:0;PCL:0;RULEID:(2390118)(7020095)(4652040)(8989299)(4534185)(4627221)(201703031133081)(201702281549075)(8990200)(5600109)(711020)(2017052603328)(7153060)(7193020);SRVR:DM5PR18MB2278; 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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: 793f6c8e-dc3a-4011-328b-08d6781a59a9 X-MS-Exchange-CrossTenant-originalarrivaltime: 11 Jan 2019 23:13:09.2153 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: e0a7ca1f-2458-4cd6-a7c7-d733c07495ab X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR18MB2278 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 Fixes: 55dda0abcf9d ("tools: iio: iio_generic_buffer: allow continuous loop= ing") --- v2: - No content change; added a Fixes tag. 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