[2/2] cxl: Fail mmap if requested mapping is larger than assigned problem state area

[Michael Ellerman]

On Tue, 2015-07-07 at 05:45:46 UTC, Ian Munsie wrote:
> From: Ian Munsie <imunsie at au1.ibm.com>
> 
> This patch makes the mmap call fail outright if the requested region is
> larger than the problem state area assigned to the context so the error
> is reported immediately rather than waiting for an attempt to access an
> address out of bounds.
> 
> Although we never expect users to map more than the assigned problem
> state area and are not aware of anyone doing this (other than for
> testing), this does have the potential to break users if someone has
> used a larger range regardless. I'm submitting it for consideration, but
> if this change is not considered acceptable the previous patch is
> sufficient to prevent access out of bounds without breaking anyone.
> 
> Signed-off-by: Ian Munsie <imunsie at au1.ibm.com>

Applied to powerpc fixes, thanks.

https://git.kernel.org/cgit/linux/kernel/git/powerpc/linux.git/commit/?h=fixes&id=5caaf5346892d1e7f0b8b7223062644f8538483f

cheers