linux-hardening - Coverity: tc358746_g_register(): Error handling issues

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Message-ID: <202211100829.085BC218E@keescook>
Date:   Thu, 10 Nov 2022 08:29:38 -0800
From:   coverity-bot <keescook@...omium.org>
To:     Marco Felsch <m.felsch@...gutronix.de>
Cc:     linux-kernel@...r.kernel.org,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Jean-Michel Hautbois <jeanmichel.hautbois@...asonboard.com>,
        Shawn Tu <shawnx.tu@...el.com>, linux-media@...r.kernel.org,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>,
        Hans Verkuil <hverkuil@...all.nl>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        linux-next@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Coverity: tc358746_g_register(): Error handling issues

Hello!

This is an experimental semi-automated report about issues detected by
Coverity from a scan of next-20221110 as part of the linux-next scan project:
https://scan.coverity.com/projects/linux-next-weekly-scan

You're getting this email because you were associated with the identified
lines of code (noted below) that were touched by commits:

  Thu Oct 27 14:48:40 2022 +0300
    80a21da36051 ("media: tc358746: add Toshiba TC358746 Parallel to CSI-2 bridge driver")

Coverity reported the following:

*** CID 1527254:  Error handling issues  (CHECKED_RETURN)
drivers/media/i2c/tc358746.c:998 in tc358746_g_register()
992     	/* 32-bit registers starting from CLW_DPHYCONTTX */
993     	reg->size = reg->reg < CLW_DPHYCONTTX_REG ? 2 : 4;
994
995     	if (!pm_runtime_get_if_in_use(sd->dev))
996     		return 0;
997
vvv     CID 1527254:  Error handling issues  (CHECKED_RETURN)
vvv     Calling "tc358746_read" without checking return value (as is done elsewhere 5 out of 6 times).
998     	tc358746_read(tc358746, reg->reg, (u32 *)&reg->val);
999
1000     	pm_runtime_mark_last_busy(sd->dev);
1001     	pm_runtime_put_sync_autosuspend(sd->dev);
1002
1003     	return 0;

If this is a false positive, please let us know so we can mark it as
such, or teach the Coverity rules to be smarter. If not, please make
sure fixes get into linux-next. :) For patches fixing this, please
include these lines (but double-check the "Fixes" first):

Reported-by: coverity-bot <keescook+coverity-bot@...omium.org>
Addresses-Coverity-ID: 1527254 ("Error handling issues")
Fixes: 80a21da36051 ("media: tc358746: add Toshiba TC358746 Parallel to CSI-2 bridge driver")

Thanks for your attention!

-- 
Coverity-bot