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([2600:8803:e7e4:500:3548:c22e:ea52:dbc7]) by smtp.gmail.com with ESMTPSA id 46e09a7af769-7e367d4fdf4sm3619324a34.14.2026.05.09.14.25.09 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sat, 09 May 2026 14:25:11 -0700 (PDT) Message-ID: Date: Sat, 9 May 2026 16:25:09 -0500 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] iio: chemical: scd30: Prevent potential divide-by-zero error To: Maxwell Doose , jic23@kernel.org Cc: Tomasz Duszynski , =?UTF-8?Q?Nuno_S=C3=A1?= , Andy Shevchenko , "open list:IIO SUBSYSTEM AND DRIVERS" , open list References: <20260509211921.84969-1-m32285159@gmail.com> Content-Language: en-US From: David Lechner In-Reply-To: <20260509211921.84969-1-m32285159@gmail.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 5/9/26 4:19 PM, Maxwell Doose wrote: > In scd30_read_raw, the current value of tmp in the > IIO_CHAN_INFO_SAMP_FREQ case is unchecked. Add checking to see if the > value we got was 0 to prevent a divide-by-zero error. > > Fixes: 64b3d8b1b0f5 ("iio: chemical: scd30: add core driver") > Signed-off-by: Maxwell Doose > --- > drivers/iio/chemical/scd30_core.c | 7 +++++++ > 1 file changed, 7 insertions(+) > > diff --git a/drivers/iio/chemical/scd30_core.c b/drivers/iio/chemical/scd30_core.c > index be8c055be184..3e2bb6f4e42c 100644 > --- a/drivers/iio/chemical/scd30_core.c > +++ b/drivers/iio/chemical/scd30_core.c > @@ -237,6 +237,13 @@ static int scd30_read_raw(struct iio_dev *indio_dev, struct iio_chan_spec const > if (ret) > return ret; > > + /* Likely only taken if something really strange happens */ Instead of saying "strange" I would mention a possible hardware failure to justify the EIO return. I'm assuming this is reading the value over SPI or I2C? > + if (!tmp) { > + dev_err(&indio_dev->dev, > + "Invalid measurement interval 0 received\n"); > + return -EIO; > + } > + > *val = 0; > *val2 = 1000000000 / tmp; > return IIO_VAL_INT_PLUS_NANO;