[ipxe-devel] [PATCH 1/1] [efi] avoid unaligned read in efi_devpath_end()

Michael Brown mcb30 at ipxe.org
Wed Mar 28 19:02:13 UTC 2018

On 28/03/18 19:49, Heinrich Schuchardt wrote:
> The old coding resulted in a "data abort" when compiled with gcc 6.3 for
> armhf and run on an Allwinner A20 SOC.
> The unaligned access occured when path->Length was on an uneven address.

There's no way that the code:

> -			 ( ( path->Length[1] << 8 ) | path->Length[0] ) );

should ever be able to produce an unaligned access abort, since it just 
dereferences individual bytes.  What do you see if you disassemble the 
object code?


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