linux-kernel - Re: [PATCH net-next v6] net: hv_netvsc: fix netvsc_send_completion to avoid multiple message length checks

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Message-ID: <20231001193521.GV92317@kernel.org>
Date:   Sun, 1 Oct 2023 21:35:21 +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 v6] net: hv_netvsc: fix netvsc_send_completion
 to avoid multiple message length checks

On Wed, Sep 27, 2023 at 02:19:16PM -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>

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