On 16.05.2017 09:56, Mikko Perttunen wrote:
> On 14.05.2017 23:47, Dmitry Osipenko wrote:
>> + if (reloc->cmdbuf.offset & 3 ||
>> + reloc->cmdbuf.offset > obj->gem.size) {
>
> This could still fail if the bo's size is not divisible by 4, even with >=
> comparison (we would overwrite the buffer by 1 to 3 bytes). I would do the same
> as in the gather case, i.e. find out the address immediately after the write and
> compare using >. Perhaps add a helper function if it makes sense. I also don't
> think the "& 3" checks are needed.
>
Sorry, I forgot to mention the reason of the relocations cmdbuf offset alignment
requirement in the commit description. So the reason is that during the patching
of the gather in do_relocs(), the unaligned offset would cause a partial
overwrite of the command buffer word following the relocation and only a part of
the relocation address being written to the actual address word.
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