netdev - RE: [PATCH net 3/7 v2] bnx2x: fix possible overrun of VFPF multicast addresses array

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Message-ID: <BL2PR07MB230674114D97A4A4EBB78F158D2F0@BL2PR07MB2306.namprd07.prod.outlook.com>
Date:   Tue, 7 Mar 2017 15:54:35 +0000
From:   "Mintz, Yuval" <Yuval.Mintz@...ium.com>
To:     Michal Schmidt <mschmidt@...hat.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC:     "Elior, Ariel" <Ariel.Elior@...ium.com>
Subject: RE: [PATCH net 3/7 v2] bnx2x: fix possible overrun of VFPF multicast
 addresses array

> It is too late to check for the limit of the number of VF multicast addresses
> after they have already been copied to the req->multicast[] array, possibly
> overflowing it.
> 
> Do the check before copying.
> 
> Checking early also avoids having to (and forgetting to) unlock vf2pf_mutex.
> 
> While we're looking at the error paths in the function, also return an error
> code from it when the PF responds with an error. Even though the caller
> ignores it.
> 
> v2: Move the check before bnx2x_vfpf_prep() as suggested by Yuval.
> 
> Signed-off-by: Michal Schmidt <mschmidt@...hat.com>

Acked-by: Yuval Mintz <Yuval.Mintz@...ium.com