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2026 17:37:17 +0000 From: "Pradhan, Sanman" To: "linux-hwmon@vger.kernel.org" CC: "linux@roeck-us.net" , "vasileios.amoiridis@cern.ch" , "leo.yang.sy0@gmail.com" , "wensheng@yeah.net" , "linux-kernel@vger.kernel.org" , Sanman Pradhan , "stable@vger.kernel.org" Subject: [PATCH 2/5] hwmon: (pmbus/mp2975) Add error check for pmbus_read_word_data() return value Thread-Topic: [PATCH 2/5] hwmon: (pmbus/mp2975) Add error check for pmbus_read_word_data() return value Thread-Index: AQHctjSzXIVxk2f4B0ywXSXOJzgdvQ== Date: Tue, 17 Mar 2026 17:37:17 +0000 Message-ID: <20260317173308.382545-3-sanman.pradhan@hpe.com> References: <20260317173308.382545-1-sanman.pradhan@hpe.com> In-Reply-To: <20260317173308.382545-1-sanman.pradhan@hpe.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-publictraffictype: Email x-ms-traffictypediagnostic: CH3PR84MB3523:EE_|SJ0PR84MB1579:EE_ x-ms-office365-filtering-correlation-id: a8a80835-0ccd-480b-9daa-08de844bd596 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a=NCWKwCw8Xy9Og0ibBRsL:22 a=OUXY8nFuAAAA:8 a=VwQbUJbxAAAA:8 a=_gXBvBSidZrcrPkRqYIA:9 a=wPNLvfGTeEIA:10 a=cAcMbU7R10T-QSRYIcO_:22 X-HPE-SCL: -1 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-03-17_03,2026-03-17_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 lowpriorityscore=0 adultscore=0 clxscore=1011 malwarescore=0 impostorscore=0 suspectscore=0 phishscore=0 priorityscore=1501 bulkscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2603050001 definitions=main-2603170155 Content-Type: text/plain; charset="utf-8" From: Sanman Pradhan mp2973_read_word_data() XORs the return value of pmbus_read_word_data() with PB_STATUS_POWER_GOOD_N without first checking for errors. If the I2C transaction fails, a negative error code is XORed with the constant, producing a corrupted value that is returned as valid status data instead of propagating the error. Add the missing error check before modifying the return value. Fixes: acda945afb465 ("hwmon: (pmbus/mp2975) Fix PGOOD in READ_STATUS_WORD") Cc: stable@vger.kernel.org Signed-off-by: Sanman Pradhan --- drivers/hwmon/pmbus/mp2975.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/hwmon/pmbus/mp2975.c b/drivers/hwmon/pmbus/mp2975.c index c31982d851962..d0bc47b12cb07 100644 --- a/drivers/hwmon/pmbus/mp2975.c +++ b/drivers/hwmon/pmbus/mp2975.c @@ -313,6 +313,8 @@ static int mp2973_read_word_data(struct i2c_client *cli= ent, int page, case PMBUS_STATUS_WORD: /* MP2973 & MP2971 return PGOOD instead of PB_STATUS_POWER_GOOD_N. */ ret =3D pmbus_read_word_data(client, page, phase, reg); + if (ret < 0) + return ret; ret ^=3D PB_STATUS_POWER_GOOD_N; break; case PMBUS_OT_FAULT_LIMIT: --=20 2.34.1