powerpc/pseries: Correct possible read beyond dlpar sysfs buffer

[Michael Ellerman]

On Thu, 2016-11-17 at 16:38:10 UTC, Nathan Fontenot wrote:
> The pasrsing of data written to the dlpar file in sysfs does not correctly
> account for the possibility of reading past the end of the buffer. The code
> assumes that all pieces of the command witten to the sysfs file are present
> in the form "<resource> <action> <id_type> <id>".
> 
> Correct this by updating the buffer parsing code to make a local copy and
> use the strsep() and sysfs_streq() routines to parse the buffer. This patch
> also separates the parsing code into subroutines for each piece of the
> command.
> 
> Signed-off-by: Nathan Fontenot <nfont at linux.vnet.ibm.com>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/25b587fba9a4198e7ea2e2319d62e2

cheers