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Fri, 18 Oct 2024 11:54:55 -0700 (PDT) Received: from Emma ([2401:4900:1c97:c88d:5054:ff:fe53:2787]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-7eacc23a42esm1719726a12.44.2024.10.18.11.54.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 18 Oct 2024 11:54:55 -0700 (PDT) From: Karan Sanghavi Date: Fri, 18 Oct 2024 18:54:42 +0000 Subject: [PATCH] iio: chemical: sps30: Add Null pointer check Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20241018-cid1593398badshift-v1-1-11550a10ff25@gmail.com> X-B4-Tracking: v=1; b=H4sIAPGuEmcC/x3MQQqAIBBA0avErBMaTXC6SrQwnWo2FRoRSHdPW r7F/wUyJ+EMQ1Mg8S1Zjr0C2wbC5veVlcRq0J3usUOngkS0ZAy52ce8yXIpCha1NzPpSFDDM/E izz8dp/f9AASSchBkAAAA To: Tomasz Duszynski , Jonathan Cameron , Lars-Peter Clausen Cc: linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org, Shuah Khan , Karan Sanghavi , Karan Sanghavi X-Mailer: b4 0.13.0 X-Developer-Signature: v=1; a=ed25519-sha256; t=1729277691; l=1425; i=karansanghvi98@gmail.com; s=20241017; h=from:subject:message-id; bh=odZmaSe2NUxwSwK+Ojy4z/lhi5LMpyFMzzCvQnjosyE=; b=GbzYKIb7BZUyUqmmCxEbpouMabZsCp77rLR+fCU8qPizrvecasyOU3rrT1K8XWjC6ZLnZVeya uXWMjNKe1wZALbKoQQelE1o9aUANiAxDubn4jTyi8gRAcMRQfinL9js X-Developer-Key: i=karansanghvi98@gmail.com; a=ed25519; pk=UAcbefT1C06npNVDJHdgpPqTm4WE9IhaA1fmJb3A37Y= Add a Null pointer check before assigning and incrementing the null pointer Signed-off-by: Karan Sanghavi --- drivers/iio/chemical/sps30_i2c.c | 20 +++++++++++--------- 1 file changed, 11 insertions(+), 9 deletions(-) diff --git a/drivers/iio/chemical/sps30_i2c.c b/drivers/iio/chemical/sps30_= i2c.c index 1b21b6bcd0e7..d2142e4c748c 100644 --- a/drivers/iio/chemical/sps30_i2c.c +++ b/drivers/iio/chemical/sps30_i2c.c @@ -105,16 +105,18 @@ static int sps30_i2c_command(struct sps30_state *stat= e, u16 cmd, void *arg, size return ret; =20 /* validate received data and strip off crc bytes */ - tmp =3D rsp; - for (i =3D 0; i < rsp_size; i +=3D 3) { - crc =3D crc8(sps30_i2c_crc8_table, buf + i, 2, CRC8_INIT_VALUE); - if (crc !=3D buf[i + 2]) { - dev_err(state->dev, "data integrity check failed\n"); - return -EIO; + if (rsp) { + tmp =3D rsp; + for (i =3D 0; i < rsp_size; i +=3D 3) { + crc =3D crc8(sps30_i2c_crc8_table, buf + i, 2, CRC8_INIT_VALUE); + if (crc !=3D buf[i + 2]) { + dev_err(state->dev, "data integrity check failed\n"); + return -EIO; + } + + *tmp++ =3D buf[i]; + *tmp++ =3D buf[i + 1]; } - - *tmp++ =3D buf[i]; - *tmp++ =3D buf[i + 1]; } =20 return 0; --- base-commit: f2493655d2d3d5c6958ed996b043c821c23ae8d3 change-id: 20241018-cid1593398badshift-9c512a3b92d9 Best regards, --=20 Karan Sanghavi