From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A7B91882C for ; Fri, 10 Mar 2023 15:15:53 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0E3F1C433D2; Fri, 10 Mar 2023 15:15:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1678461353; bh=awSGxbBJbNwqQAGMSrILvpViFoA4EgDdJh89yVRtIHM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=GaF4iV+6qWp0wh7UQ5EUPMmlWysGX6DllVXyleYx80ynbm5u6Bbj7CHJjlSrulbhz 7TRh00oKdKDa2aPyoIzLJZZxZmEkum4gp9SSjnlhVhheUPx5pXWYl6hcrk/lngeiX8 7KncM2SUxbEiMB/LHXLztIaY49lcUifuCGPSD8cI= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Harshit Mogalapalli , Jonathan Cameron , Sasha Levin Subject: [PATCH 5.15 092/136] iio: accel: mma9551_core: Prevent uninitialized variable in mma9551_read_status_word() Date: Fri, 10 Mar 2023 14:43:34 +0100 Message-Id: <20230310133709.941198740@linuxfoundation.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230310133706.811226272@linuxfoundation.org> References: <20230310133706.811226272@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Harshit Mogalapalli [ Upstream commit e56d2c34ce9dc122b1a618172ec0e05e50adb9e9 ] Smatch Warns: drivers/iio/accel/mma9551_core.c:357 mma9551_read_status_word() error: uninitialized symbol 'v'. When (offset >= 1 << 12) is true mma9551_transfer() will return -EINVAL without 'v' being initialized, so check for the error and return. Note: Not a bug as such because the caller checks return value and doesn't not use this parameter in the problem case. Signed-off-by: Harshit Mogalapalli Link: https://lore.kernel.org/r/20230126152147.3585874-1-harshit.m.mogalapalli@oracle.com Signed-off-by: Jonathan Cameron Signed-off-by: Sasha Levin --- drivers/iio/accel/mma9551_core.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/iio/accel/mma9551_core.c b/drivers/iio/accel/mma9551_core.c index fbf2e2c45678b..413610a749c24 100644 --- a/drivers/iio/accel/mma9551_core.c +++ b/drivers/iio/accel/mma9551_core.c @@ -354,9 +354,12 @@ int mma9551_read_status_word(struct i2c_client *client, u8 app_id, ret = mma9551_transfer(client, app_id, MMA9551_CMD_READ_STATUS, reg, NULL, 0, (u8 *)&v, 2); + if (ret < 0) + return ret; + *val = be16_to_cpu(v); - return ret; + return 0; } EXPORT_SYMBOL(mma9551_read_status_word); -- 2.39.2