From: Gal Pressman <pressman...@gmail.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 <pressman...@gmail.com>
Applied and queued up for -stable.
