linux-kernel - Re: [PATCH v2] IB/rxe: don't crash, if allocation of crc algorithm failed

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Date:   Fri, 10 Nov 2017 13:44:05 -0500
From:   Doug Ledford <dledford@...hat.com>
To:     Thomas Bogendoerfer <tbogendoerfer@...e.de>,
        Moni Shoua <monis@...lanox.com>, linux-rdma@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] IB/rxe: don't crash, if allocation of crc algorithm
 failed

On Tue, 2017-10-31 at 11:16 +0100, Thomas Bogendoerfer wrote:
> Following crash happens, if crc algorithm couldn't be allocated:
> 
> [ 1087.989072] rdma_rxe: loaded
> [ 1097.855397] PCLMULQDQ-NI instructions are not detected.
> [ 1097.901220] rdma_rxe: failed to allocate crc algorithmi err:-2
> [ 1097.901248] BUG: unable to handle kernel
> [ 1097.901249] NULL pointer dereference
> [ 1097.901250]  at 0000000000000046
> [...]
> 
> Reason is that rxe->tfm is assigned the error return, which will then
> be used for crypto_free_shash() in rxe_cleanup. Fix by using a
> temporary variable and assigning it rxe->tfm after allocation succeeded.
> 
> Fixes: cee2688e3cd6 ("IB/rxe: Offload CRC calculation when possible")
> Signed-off-by: Thomas Bogendoerfer <tbogendoerfer@...e.de>

Thanks, applied.

-- 
Doug Ledford <dledford@...hat.com>
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