linux-kernel - Re: [PATCH net V2] vhost: correctly check the return value of translate_desc() in log

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Date:   Tue, 19 Feb 2019 13:16:09 -0800 (PST)
From:   David Miller <davem@...emloft.net>
To:     jasowang@...hat.com
Cc:     mst@...hat.com, kvm@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net V2] vhost: correctly check the return value of
 translate_desc() in log_used()

From: Jason Wang <jasowang@...hat.com>
Date: Tue, 19 Feb 2019 14:53:44 +0800

> When fail, translate_desc() returns negative value, otherwise the
> number of iovs. So we should fail when the return value is negative
> instead of a blindly check against zero.
> 
> Detected by CoverityScan, CID# 1442593:  Control flow issues  (DEADCODE)
> 
> Fixes: cc5e71075947 ("vhost: log dirty page correctly")
> Acked-by: Michael S. Tsirkin <mst@...hat.com>
> Reported-by: Stephen Hemminger <stephen@...workplumber.org>
> Signed-off-by: Jason Wang <jasowang@...hat.com>

Applied and queued up for -stable, thanks.