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[2a02:8389:41cf:e200:3314:d4ec:5095:daa3]) by smtp.gmail.com with ESMTPSA id h3-20020a0564020e8300b00560622cd10fsm98362eda.68.2024.02.07.13.17.09 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 07 Feb 2024 13:17:10 -0800 (PST) From: Javier Carrasco Date: Wed, 07 Feb 2024 22:17:08 +0100 Subject: [PATCH 1/2] hwmon: chipcap2: fix uninitialized variable in cc2_get_reg_val() Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240207-chipcap2_init_vars-v1-1-08cafe43e20e@gmail.com> References: <20240207-chipcap2_init_vars-v1-0-08cafe43e20e@gmail.com> In-Reply-To: <20240207-chipcap2_init_vars-v1-0-08cafe43e20e@gmail.com> To: Jean Delvare , Guenter Roeck , Dan Carpenter Cc: linux-hwmon@vger.kernel.org, linux-kernel@vger.kernel.org, Javier Carrasco X-Mailer: b4 0.13-dev-0434a X-Developer-Signature: v=1; a=ed25519-sha256; t=1707340628; l=1189; i=javier.carrasco.cruz@gmail.com; s=20230509; h=from:subject:message-id; bh=NYZpM+IYT/xIIde173sVPPc8ESzfdo3M3EJ+e0bPr+8=; b=hq+dmogC+6WNc0XZnq3PNPzOt9pIgsUJm+gwsRP/m9lKu3QOnW3KGWfDztWs+IJwJqgWG+Q7N rIZjrohiaxkD+kYqaRmcjseSLLW/ZU0T8oDYdgzsyl6QFC5oJRn7iEG X-Developer-Key: i=javier.carrasco.cruz@gmail.com; a=ed25519; pk=tIGJV7M+tCizagNijF0eGMBGcOsPD+0cWGfKjl4h6K8= X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1790276451628861185 X-GMAIL-MSGID: 1790276451628861185 The reg_val variable in cc2_get_reg_val() might be used without a known value if cc2_read_reg() fails. That leads to a useless data conversion because the returned error means the read operation failed and the data is not relevant. That makes its initial value irrelevant as well, so skip the data conversion instead. If no error happens, a value is assigned to reg_val and the data conversion is required. Reported-by: Dan Carpenter Closes: https://lore.kernel.org/linux-hwmon/294e4634-89d4-415e-a723-b208d8770d7c@gmail.com/T/#t Signed-off-by: Javier Carrasco --- drivers/hwmon/chipcap2.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/hwmon/chipcap2.c b/drivers/hwmon/chipcap2.c index a62c507b1042..3b604fc5d8ae 100644 --- a/drivers/hwmon/chipcap2.c +++ b/drivers/hwmon/chipcap2.c @@ -324,7 +324,9 @@ static int cc2_get_reg_val(struct cc2_data *data, u8 reg, long *val) int ret; ret = cc2_read_reg(data, reg, ®_val); - *val = cc2_rh_convert(reg_val); + if (!ret) + *val = cc2_rh_convert(reg_val); + cc2_disable(data); return ret;