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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

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>