netdev - Re: [PATCH net] net: ena: Fix use of uninitialized DMA address bits field

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Message-Id: <20180726.213104.1753644654134817472.davem@davemloft.net>
Date:   Thu, 26 Jul 2018 21:31:04 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     pressmangal@...il.com
Cc:     netdev@...r.kernel.org, netanel@...zon.com
Subject: Re: [PATCH net] net: ena: Fix use of uninitialized DMA address
 bits field

From: Gal Pressman <pressmangal@...il.com>
Date: Thu, 26 Jul 2018 23:40:33 +0300

> UBSAN triggers the following undefined behaviour warnings:
> [...]
> [   13.236124] UBSAN: Undefined behaviour in drivers/net/ethernet/amazon/ena/ena_eth_com.c:468:22
> [   13.240043] shift exponent 64 is too large for 64-bit type 'long long unsigned int'
> [...]
> [   13.744769] UBSAN: Undefined behaviour in drivers/net/ethernet/amazon/ena/ena_eth_com.c:373:4
> [   13.748694] shift exponent 64 is too large for 64-bit type 'long long unsigned int'
> [...]
> 
> When splitting the address to high and low, GENMASK_ULL is used to generate
> a bitmask with dma_addr_bits field from io_sq (in ena_com_prepare_tx and
> ena_com_add_single_rx_desc).
> The problem is that dma_addr_bits is not initialized with a proper value
> (besides being cleared in ena_com_create_io_queue).
> Assign dma_addr_bits the correct value that is stored in ena_dev when
> initializing the SQ.
> 
> Fixes: 1738cd3ed342 ("net: ena: Add a driver for Amazon Elastic Network Adapters (ENA)")
> Signed-off-by: Gal Pressman <pressmangal@...il.com>

Applied and queued up for -stable.