netdev - Re: [PATCH net-next] qed: Prevent stack corruption on MFW interaction

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Message-Id: <20161109.132745.2191587840450609497.davem@davemloft.net>
Date:   Wed, 09 Nov 2016 13:27:45 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     Yuval.Mintz@...ium.com
Cc:     netdev@...r.kernel.org
Subject: Re: [PATCH net-next] qed: Prevent stack corruption on MFW
 interaction

From: Yuval Mintz <Yuval.Mintz@...ium.com>
Date: Sun, 6 Nov 2016 17:12:27 +0200

> Driver uses a union for copying data to & from management firmware
> when interacting with it.
> Problem is that the function always copies sizeof(union) while commit
> 2edbff8dcb5d ("qed: Learn resources from management firmware") is casting
> a union elements which is of smaller size [24-byte instead of 88-bytes].
> 
> Also, the union contains some inappropriate elements which increase its
> size [should have been 32-bytes]. While this shouldn't corrupt other
> PF messages to the MFW [as management firmware enforces permissions so
> that each PF is allowed to write only to its own mailbox] we fix this
> here as well.
> 
> Fixes: 2edbff8dcb5d ("qed: Learn resources from management firmware")
> Signed-off-by: Yuval Mintz <Yuval.Mintz@...ium.com>

Applied.