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

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Date:   Fri, 13 Jan 2023 15:46:49 -0800
From:   coverity-bot <keescook@...omium.org>
To:     Liam Howlett <liam.howlett@...cle.com>
Cc:     "Liam R. Howlett" <Liam.Howlett@...cle.com>,
        Holger Hoffsttte <holger@...lied-asynchrony.com>,
        linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        stable@...r.kernel.org, linux-mm@...ck.org, amanieu@...il.com,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        linux-next@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Coverity: check_empty_area_window(): Error handling issues

Hello!

This is an experimental semi-automated report about issues detected by
Coverity from a scan of next-20230113 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:

  Wed Jan 11 16:15:43 2023 -0800
    ebc4c1bcc2a5 ("maple_tree: fix mas_empty_area_rev() lower bound validation")

Coverity reported the following:

*** CID 1530569:  Error handling issues  (CHECKED_RETURN)
lib/test_maple_tree.c:2598 in check_empty_area_window()
2592     	MT_BUG_ON(mt, mas_empty_area(&mas, 5, 100, 6) != -EBUSY);
2593
2594     	mas_reset(&mas);
2595     	MT_BUG_ON(mt, mas_empty_area(&mas, 0, 8, 10) != -EBUSY);
2596
2597     	mas_reset(&mas);
vvv     CID 1530569:  Error handling issues  (CHECKED_RETURN)
vvv     Calling "mas_empty_area" without checking return value (as is done elsewhere 8 out of 10 times).
2598     	mas_empty_area(&mas, 100, 165, 3);
2599
2600     	mas_reset(&mas);
2601     	MT_BUG_ON(mt, mas_empty_area(&mas, 100, 163, 6) != -EBUSY);
2602     	rcu_read_unlock();
2603     }

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: 1530569 ("Error handling issues")
Fixes: ebc4c1bcc2a5 ("maple_tree: fix mas_empty_area_rev() lower bound validation")

Thanks for your attention!

-- 
Coverity-bot