From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932738Ab3CNNa2 (ORCPT ); Thu, 14 Mar 2013 09:30:28 -0400 Received: from merlin.infradead.org ([205.233.59.134]:33707 "EHLO merlin.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757678Ab3CNNa1 (ORCPT ); Thu, 14 Mar 2013 09:30:27 -0400 Message-ID: <1363267820.4853.41.camel@i7.infradead.org> Subject: [PATCH] hwmon: (pmbus) Fix krealloc() misuse in pmbus_add_attribute() From: David Woodhouse To: Guenter Roeck Cc: Jean Delvare , linux-kernel@vger.kernel.org Date: Thu, 14 Mar 2013 13:30:20 +0000 Content-Type: multipart/signed; micalg="sha1"; protocol="application/x-pkcs7-signature"; boundary="=-oWaQ4j4FP9tOD51UOsMS" X-Mailer: Evolution 3.6.3 (3.6.3-2.fc18) Mime-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by merlin.infradead.org See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --=-oWaQ4j4FP9tOD51UOsMS Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable If krealloc() returns NULL, it *doesn't* free the original. So any code of the form 'foo =3D krealloc(foo, =E2=80=A6);' is almost certainly a bug. Signed-off-by: David Woodhouse --- drivers/hwmon/pmbus/pmbus_core.c | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-) diff --git a/drivers/hwmon/pmbus/pmbus_core.c b/drivers/hwmon/pmbus/pmbus_c= ore.c index 80eef50..9add6092 100644 --- a/drivers/hwmon/pmbus/pmbus_core.c +++ b/drivers/hwmon/pmbus/pmbus_core.c @@ -766,12 +766,14 @@ static ssize_t pmbus_show_label(struct device *dev, static int pmbus_add_attribute(struct pmbus_data *data, struct attribute *= attr) { if (data->num_attributes >=3D data->max_attributes - 1) { - data->max_attributes +=3D PMBUS_ATTR_ALLOC_SIZE; - data->group.attrs =3D krealloc(data->group.attrs, - sizeof(struct attribute *) * - data->max_attributes, GFP_KERNEL); - if (data->group.attrs =3D=3D NULL) + int new_max_attrs =3D data->max_attributes + PMBUS_ATTR_ALLOC_SIZE; + void *new_attrs =3D krealloc(data->group.attrs, + new_max_attrs * sizeof(void *), + GFP_KERNEL); + if (!new_attrs) return -ENOMEM; + data->group.attrs =3D new_attrs; + data->max_attributes =3D new_max_attrs; } =20 data->group.attrs[data->num_attributes++] =3D attr; --=20 1.8.1.4 --=20 David Woodhouse Open Source Technology Centre David.Woodhouse@intel.com Intel Corporation --=-oWaQ4j4FP9tOD51UOsMS Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIIUbjCCBjQw ggQcoAMCAQICAR4wDQYJKoZIhvcNAQEFBQAwfTELMAkGA1UEBhMCSUwxFjAUBgNVBAoTDVN0YXJ0 Q29tIEx0ZC4xKzApBgNVBAsTIlNlY3VyZSBEaWdpdGFsIENlcnRpZmljYXRlIFNpZ25pbmcxKTAn BgNVBAMTIFN0YXJ0Q29tIENlcnRpZmljYXRpb24gQXV0aG9yaXR5MB4XDTA3MTAyNDIxMDE1NVoX DTE3MTAyNDIxMDE1NVowgYwxCzAJBgNVBAYTAklMMRYwFAYDVQQKEw1TdGFydENvbSBMdGQuMSsw KQYDVQQLEyJTZWN1cmUgRGlnaXRhbCBDZXJ0aWZpY2F0ZSBTaWduaW5nMTgwNgYDVQQDEy9TdGFy dENvbSBDbGFzcyAxIFByaW1hcnkgSW50ZXJtZWRpYXRlIENsaWVudCBDQTCCASIwDQYJKoZIhvcN AQEBBQADggEPADCCAQoCggEBAMcJg8zOLdgasSmkLhOrlr6KMoOMpohBllVHrdRvEg/q6r8jR+EK 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