grep: fix for CVE-2012-5667

grep: fix for CVE-2012-5667

Multiple integer overflows in GNU Grep before 2.11 might allow
context-dependent attackers to execute arbitrary code via vectors
involving a long input line that triggers a heap-based buffer overflow.

http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2012-5667

Signed-off-by: Ming Liu <ming.liu@windriver.com>
Signed-off-by: Mark Hatle <mark.hatle@windriver.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>