linux-kernel - Coverity: rswitch_gwca_queue_alloc

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Message-ID: <202211041229.F3B37C03@keescook>
Date:   Fri, 4 Nov 2022 12:29:35 -0700
From:   coverity-bot <keescook@...omium.org>
To:     Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
Cc:     Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
        Richard Cochran <richardcochran@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Andrew Lunn <andrew@...n.ch>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Sergey Shtylyov <s.shtylyov@....ru>,
        linux-renesas-soc@...r.kernel.org,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        linux-next@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Coverity: rswitch_gwca_queue_alloc_skb(): Control flow issues

Hello!

This is an experimental semi-automated report about issues detected by
Coverity from a scan of next-20221104 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 Nov 2 12:38:53 2022 +0000
    3590918b5d07 ("net: ethernet: renesas: Add support for "Ethernet Switch"")

Coverity reported the following:

*** CID 1527147:  Control flow issues  (NO_EFFECT)
drivers/net/ethernet/renesas/rswitch.c:270 in rswitch_gwca_queue_alloc_skb()
264     			goto err;
265     	}
266
267     	return 0;
268
269     err:
vvv     CID 1527147:  Control flow issues  (NO_EFFECT)
vvv     This greater-than-or-equal-to-zero comparison of an unsigned value is always true. "i >= 0U".
270     	for (i--; i >= 0; i--) {
271     		index = (i + start_index) % gq->ring_size;
272     		dev_kfree_skb(gq->skbs[index]);
273     		gq->skbs[index] = NULL;
274     	}
275

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: 1527147 ("Control flow issues")
Fixes: 3590918b5d07 ("net: ethernet: renesas: Add support for "Ethernet Switch"")

Thanks for your attention!

-- 
Coverity-bot