Re: [PATCH 1/4] thunderbolt: dma_port: Fix NVM read buffer bounds and offset issue

[Mika Westerberg <mika.westerberg@linux.intel.com>]

On Mon, May 17, 2021 at 02:59:04PM +0300, Mika Westerberg wrote:
> From: Mathias Nyman <mathias.nyman@linux.intel.com>
> 
> Up to 64 bytes of data can be read from NVM in one go. Read address
> must be dword aligned. Data is read into a local buffer.
> 
> If caller asks to read data starting at an unaligned address then full
> dword is anyway read from NVM into a local buffer. Data is then copied
> from the local buffer starting at the unaligned offset to the caller
> buffer.
> 
> In cases where asked data length + unaligned offset is over 64 bytes
> we need to make sure we don't read past the 64 bytes in the local
> buffer when copying to caller buffer, and make sure that we don't
> skip copying unaligned offset bytes from local buffer anymore after
> the first round of 64 byte NVM data read.
> 
> Fixes: 3e13676862f9 ("thunderbolt: Add support for DMA configuration based mailbox")
> Cc: stable@vger.kernel.org
> Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
> Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>

Applied to thunderbolt.git/fixes.