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

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Date:   Mon, 7 Nov 2016 12:17:46 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Yuval Mintz' <Yuval.Mintz@...ium.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: [PATCH net-next] qed: Prevent stack corruption on MFW
 interaction

From: Yuval Mintz
> Sent: 06 November 2016 15:12
 
> 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.
...

Is it worth adding a compile-time assert on the size of the union?

	David