linux-kernel - Re: [PATCH net-next v7] hv_netvsc: fix netvsc_send_completion to avoid multiple message length checks

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Message-ID: <20231010174516.GA1003866@kernel.org>
Date:   Tue, 10 Oct 2023 19:45:16 +0200
From:   Simon Horman <horms@...nel.org>
To:     Sonia Sharma <sosha@...ux.microsoft.com>
Cc:     linux-kernel@...r.kernel.org, linux-hyperv@...r.kernel.org,
        netdev@...r.kernel.org, sosha@...rosoft.com, kys@...rosoft.com,
        mikelley@...rosoft.com, haiyangz@...rosoft.com, wei.liu@...nel.org,
        decui@...rosoft.com, longli@...rosoft.com, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com
Subject: Re: [PATCH net-next v7] hv_netvsc: fix netvsc_send_completion to
 avoid multiple message length checks

On Mon, Oct 09, 2023 at 01:00:16AM -0700, Sonia Sharma wrote:
> From: Sonia Sharma <sonia.sharma@...ux.microsoft.com>
> 
> The switch statement in netvsc_send_completion() is incorrectly validating
> the length of incoming network packets by falling through to the next case.
> Avoid the fallthrough. Instead break after a case match and then process
> the complete() call.
> The current code has not caused any known failures. But nonetheless, the
> code should be corrected as a different ordering of the switch cases might
> cause a length check to fail when it should not.
> 
> Signed-off-by: Sonia Sharma <sonia.sharma@...ux.microsoft.com>
> 
> ---
> Changes in v3:
> * added return statement in default case as pointed by Michael Kelley.
> Changes in v4:
> * added fixes tag
> * modified commit message to explain the issue fixed by patch.
> Changes in v5:
> * Dropped fixes tag as suggested by Simon Horman.
> * fixed indentation
> Changes in v7:
> * Dropped the prefix "net" from subject line.

This seems address the concerns raised by Michael Kelly in his review of v6.

It doesn't include his (or my) Reviewed-by tag(s).
That not withstanding the logic change and overall patch looks good to me.

Reviewed-by: Simon Horman <horms@...nel.org>